Using a slit lamp-mounted digital high-speed camera for dynamic observation of phakic lenses during eye movements: a pilot study
Identifieur interne : 001C44 ( Pmc/Curation ); précédent : 001C43; suivant : 001C45Using a slit lamp-mounted digital high-speed camera for dynamic observation of phakic lenses during eye movements: a pilot study
Auteurs : Martin Alexander Leitritz [Allemagne] ; Focke Ziemssen [Allemagne] ; Karl Ulrich Bartz-Schmidt [Allemagne] ; Bogomil Voykov [Allemagne]Source :
- Clinical Ophthalmology (Auckland, N.Z.) [ 1177-5467 ] ; 2014.
Abstract
To evaluate a digital high-speed camera combined with digital morphometry software for dynamic measurements of phakic intraocular lens movements to observe kinetic influences, particularly in fast direction changes and at lateral end points.
A high-speed camera taking 300 frames per second observed movements of eight iris-claw intraocular lenses and two angle-supported intraocular lenses. Standardized saccades were performed by the patients to trigger mass inertia with lens position changes. Freeze images with maximum deviation were used for digital software-based morphometry analysis with ImageJ.
Two eyes from each of five patients (median age 32 years, range 28–45 years) without findings other than refractive errors were included. The high-speed images showed sufficient usability for further morphometric processing. In the primary eye position, the median decentrations downward and in a lateral direction were −0.32 mm (range −0.69 to 0.024) and 0.175 mm (range −0.37 to 0.45), respectively. Despite the small sample size of asymptomatic patients, we found a considerable amount of lens dislocation. The median distance amplitude during eye movements was 0.158 mm (range 0.02–0.84). There was a slight positive correlation (
With the use of a slit lamp-mounted high-speed camera system and morphometry software, observation and objective measurements of iris-claw intraocular lenses and angle-supported intraocular lenses movements seem to be possible. Slight decentration in the primary position might be an indicator of increased lens mobility during kinetic stress during eye movements. Long-term assessment by high-speed analysis with higher case numbers has to clarify the relationship between progressing motility and endothelial cell damage.
Url:
DOI: 10.2147/OPTH.S64722
PubMed: 25071365
PubMed Central: 4111662
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<author><name sortKey="Bartz Schmidt, Karl Ulrich" sort="Bartz Schmidt, Karl Ulrich" uniqKey="Bartz Schmidt K" first="Karl Ulrich" last="Bartz-Schmidt">Karl Ulrich Bartz-Schmidt</name>
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<author><name sortKey="Voykov, Bogomil" sort="Voykov, Bogomil" uniqKey="Voykov B" first="Bogomil" last="Voykov">Bogomil Voykov</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Using a slit lamp-mounted digital high-speed camera for dynamic observation of phakic lenses during eye movements: a pilot study</title>
<author><name sortKey="Leitritz, Martin Alexander" sort="Leitritz, Martin Alexander" uniqKey="Leitritz M" first="Martin Alexander" last="Leitritz">Martin Alexander Leitritz</name>
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<author><name sortKey="Ziemssen, Focke" sort="Ziemssen, Focke" uniqKey="Ziemssen F" first="Focke" last="Ziemssen">Focke Ziemssen</name>
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<wicri:regionArea>Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Tübingen</wicri:regionArea>
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<author><name sortKey="Bartz Schmidt, Karl Ulrich" sort="Bartz Schmidt, Karl Ulrich" uniqKey="Bartz Schmidt K" first="Karl Ulrich" last="Bartz-Schmidt">Karl Ulrich Bartz-Schmidt</name>
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<wicri:regionArea>Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Tübingen</wicri:regionArea>
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<author><name sortKey="Voykov, Bogomil" sort="Voykov, Bogomil" uniqKey="Voykov B" first="Bogomil" last="Voykov">Bogomil Voykov</name>
<affiliation wicri:level="1"><nlm:aff id="af1-opth-8-1361">Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Tübingen, Germany</nlm:aff>
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<series><title level="j">Clinical Ophthalmology (Auckland, N.Z.)</title>
<idno type="ISSN">1177-5467</idno>
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<imprint><date when="2014">2014</date>
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<front><div type="abstract" xml:lang="en"><sec><title>Purpose</title>
<p>To evaluate a digital high-speed camera combined with digital morphometry software for dynamic measurements of phakic intraocular lens movements to observe kinetic influences, particularly in fast direction changes and at lateral end points.</p>
</sec>
<sec><title>Materials and methods</title>
<p>A high-speed camera taking 300 frames per second observed movements of eight iris-claw intraocular lenses and two angle-supported intraocular lenses. Standardized saccades were performed by the patients to trigger mass inertia with lens position changes. Freeze images with maximum deviation were used for digital software-based morphometry analysis with ImageJ.</p>
</sec>
<sec><title>Results</title>
<p>Two eyes from each of five patients (median age 32 years, range 28–45 years) without findings other than refractive errors were included. The high-speed images showed sufficient usability for further morphometric processing. In the primary eye position, the median decentrations downward and in a lateral direction were −0.32 mm (range −0.69 to 0.024) and 0.175 mm (range −0.37 to 0.45), respectively. Despite the small sample size of asymptomatic patients, we found a considerable amount of lens dislocation. The median distance amplitude during eye movements was 0.158 mm (range 0.02–0.84). There was a slight positive correlation (<italic>r</italic>
=0.39, <italic>P</italic>
<0.001) between the grade of deviation in the primary position and the distance increase triggered by movements.</p>
</sec>
<sec><title>Conclusion</title>
<p>With the use of a slit lamp-mounted high-speed camera system and morphometry software, observation and objective measurements of iris-claw intraocular lenses and angle-supported intraocular lenses movements seem to be possible. Slight decentration in the primary position might be an indicator of increased lens mobility during kinetic stress during eye movements. Long-term assessment by high-speed analysis with higher case numbers has to clarify the relationship between progressing motility and endothelial cell damage.</p>
</sec>
</div>
</front>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">Clin Ophthalmol</journal-id>
<journal-id journal-id-type="iso-abbrev">Clin Ophthalmol</journal-id>
<journal-id journal-id-type="publisher-id">Clinical Ophthalmology</journal-id>
<journal-title-group><journal-title>Clinical Ophthalmology (Auckland, N.Z.)</journal-title>
</journal-title-group>
<issn pub-type="ppub">1177-5467</issn>
<issn pub-type="epub">1177-5483</issn>
<publisher><publisher-name>Dove Medical Press</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">25071365</article-id>
<article-id pub-id-type="pmc">4111662</article-id>
<article-id pub-id-type="doi">10.2147/OPTH.S64722</article-id>
<article-id pub-id-type="publisher-id">opth-8-1361</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Original Research</subject>
</subj-group>
</article-categories>
<title-group><article-title>Using a slit lamp-mounted digital high-speed camera for dynamic observation of phakic lenses during eye movements: a pilot study</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Leitritz</surname>
<given-names>Martin Alexander</given-names>
</name>
<xref ref-type="aff" rid="af1-opth-8-1361"></xref>
<xref ref-type="corresp" rid="c1-opth-8-1361"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Ziemssen</surname>
<given-names>Focke</given-names>
</name>
<xref ref-type="aff" rid="af1-opth-8-1361"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Bartz-Schmidt</surname>
<given-names>Karl Ulrich</given-names>
</name>
<xref ref-type="aff" rid="af1-opth-8-1361"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Voykov</surname>
<given-names>Bogomil</given-names>
</name>
<xref ref-type="aff" rid="af1-opth-8-1361"></xref>
</contrib>
</contrib-group>
<aff id="af1-opth-8-1361">Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Tübingen, Germany</aff>
<author-notes><corresp id="c1-opth-8-1361">Correspondence: Martin Alexander Leitritz, Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Schleichstrasse 12, 72076 Tübingen, Baden-Württemberg, Germany, Tel +49 7071 298 4761, Fax +49 7071 294 676, Email <email>martin.leitritz@med.uni-tuebingen.de</email>
</corresp>
</author-notes>
<pub-date pub-type="collection"><year>2014</year>
</pub-date>
<pub-date pub-type="epub"><day>18</day>
<month>7</month>
<year>2014</year>
</pub-date>
<volume>8</volume>
<fpage>1361</fpage>
<lpage>1367</lpage>
<permissions><copyright-statement>© 2014 Leitritz et al. This work is published by Dove Medical Press Ltd, and licensed under Creative Commons Attribution – Non Commercial (unported, v3.0) License</copyright-statement>
<copyright-year>2014</copyright-year>
<license><license-p>The full terms of the License are available at <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc/3.0/">http://creativecommons.org/licenses/by-nc/3.0/</ext-link>
. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Ltd, provided the work is properly attributed.</license-p>
</license>
</permissions>
<abstract><sec><title>Purpose</title>
<p>To evaluate a digital high-speed camera combined with digital morphometry software for dynamic measurements of phakic intraocular lens movements to observe kinetic influences, particularly in fast direction changes and at lateral end points.</p>
</sec>
<sec><title>Materials and methods</title>
<p>A high-speed camera taking 300 frames per second observed movements of eight iris-claw intraocular lenses and two angle-supported intraocular lenses. Standardized saccades were performed by the patients to trigger mass inertia with lens position changes. Freeze images with maximum deviation were used for digital software-based morphometry analysis with ImageJ.</p>
</sec>
<sec><title>Results</title>
<p>Two eyes from each of five patients (median age 32 years, range 28–45 years) without findings other than refractive errors were included. The high-speed images showed sufficient usability for further morphometric processing. In the primary eye position, the median decentrations downward and in a lateral direction were −0.32 mm (range −0.69 to 0.024) and 0.175 mm (range −0.37 to 0.45), respectively. Despite the small sample size of asymptomatic patients, we found a considerable amount of lens dislocation. The median distance amplitude during eye movements was 0.158 mm (range 0.02–0.84). There was a slight positive correlation (<italic>r</italic>
=0.39, <italic>P</italic>
<0.001) between the grade of deviation in the primary position and the distance increase triggered by movements.</p>
</sec>
<sec><title>Conclusion</title>
<p>With the use of a slit lamp-mounted high-speed camera system and morphometry software, observation and objective measurements of iris-claw intraocular lenses and angle-supported intraocular lenses movements seem to be possible. Slight decentration in the primary position might be an indicator of increased lens mobility during kinetic stress during eye movements. Long-term assessment by high-speed analysis with higher case numbers has to clarify the relationship between progressing motility and endothelial cell damage.</p>
</sec>
</abstract>
<kwd-group><title>Keywords</title>
<kwd>intraocular lens</kwd>
<kwd>high-speed camera</kwd>
<kwd>phakic lens</kwd>
</kwd-group>
</article-meta>
</front>
<body><sec sec-type="intro"><title>Introduction</title>
<p>Besides angle-supported intraocular lenses (ASIOLs), iris-claw intraocular lenses (ICIOLs) are also designed as anterior chamber lenses. First-generation iris-claw models were launched in 1953, and optimized designs of these are now used not only in cases of aphakia (eg, traumatic) or after intracapsular cataract extraction<xref rid="b1-opth-8-1361" ref-type="bibr">1</xref>
,<xref rid="b2-opth-8-1361" ref-type="bibr">2</xref>
but since 1986 they have also been used in phakic eyes (phakic intraocular lenses [PIOLs]) to correct refractive errors.<xref rid="b3-opth-8-1361" ref-type="bibr">3</xref>
Nowadays, Artisan<sup>®</sup>
/Artiflex<sup>®</sup>
ICIOLs (Ophthec, Groningen, the Netherlands)/Verisyse<sup>®</sup>
(Abbott Medical Optics, Santa Ana, CA, USA) and Cachet<sup>®</sup>
(Novartis International AG, Basel, Switzerland) ASIOLs are available in different versions depending on optic power and the need for correction of astigmatism.</p>
<p>Several clinical trials with variable results partially reported that the position of ICIOLs and the morphometry of the anterior chamber (eg, deep or shallow anterior chambers,<xref rid="b4-opth-8-1361" ref-type="bibr">4</xref>
white-to-white distance, or sulcus diameter) may have consequences, eg, endothelial cell loss<xref rid="b4-opth-8-1361" ref-type="bibr">4</xref>
,<xref rid="b5-opth-8-1361" ref-type="bibr">5</xref>
or chronic inflammations of the iris.<xref rid="b6-opth-8-1361" ref-type="bibr">6</xref>
,<xref rid="b7-opth-8-1361" ref-type="bibr">7</xref>
To measure in more realistic conditions, investigations using Scheimpflug photography or ultrasound biomicroscopy have also been performed.<xref rid="b8-opth-8-1361" ref-type="bibr">8</xref>
,<xref rid="b9-opth-8-1361" ref-type="bibr">9</xref>
In 1984, Miller and Doane used analog high-speed imaging to investigate movements of ASIOLs and ICIOLs (mainly Binkhorst type).<xref rid="b10-opth-8-1361" ref-type="bibr">10</xref>
Due to technical limitations, only moderate changes of the gaze position were investigated in patients after intracapsular cataract extraction.<xref rid="b10-opth-8-1361" ref-type="bibr">10</xref>
</p>
<p>The aim of our pilot study was to evaluate a digital high-speed camera setting (mounted on a slit lamp) to measure the movements of PIOLs not only at a standstill or within small globe movements but also in fast direction changes in the primary position and at lateral end points.</p>
</sec>
<sec sec-type="materials|methods"><title>Materials and methods</title>
<p>For capturing lens positions during eye movements, a high-speed charge-coupled device camera (Genie HM640; Teledyne Dalsa, Waterloo, ON, Canada) with a resolution of 640×480 pixels and speed of 300 frames per second (8 bit) was mounted (C mount) on the video adapter (f75; Haag-Streit, Köniz, Switzerland) of a conventional slit lamp (BQ900; Haag-Streit). For capturing high-speed videos, optimized software (Motion Traveller version 2.28.0.5173; Imaging Solutions, Eningen, Germany) was used. Illumination was achieved by using the total slit (8×8 mm) with the brightest illumination settings. Furthermore, a cold-light source (FlexiLux 3000; Schölly Fiberoptic, Denzlingen, Germany) was used for a more homogeneous illumination. The technical harmlessness of the setting was approved by the in-house technical assistance.</p>
<p>Before the high-speed video session, a standard slit-lamp examination was performed by an experienced ophthalmologist to survey for loose fixations, decentrations, and detectable abnormalities of the lens. Lentodonesis of the artificial lens was defined as 0 if absent, 1 if only slightly visible, or 2 in cases with obvious lens movements. Patients were asked whether they noticed any kind of shaking images.</p>
<p>Each eye of a patient was filmed separately. Sequential capturing positions were frontal without globe movement and both lateral end points of globe movements. Therefore, the slit lamp was adjusted in a parallel perspective (<xref ref-type="fig" rid="f1-opth-8-1361">Figure 1</xref>
). Thereafter, the patients were told to move their eyes reiteratively from one end position to the other (ie, from up to down or left to right; <xref ref-type="fig" rid="f2-opth-8-1361">Figure 2</xref>
, <xref ref-type="table" rid="t1-opth-8-1361">Table 1</xref>
). To trigger the kinetic effects of artificial lenses, horizontal and vertical eye movements were performed with and without short stops in the primary position.</p>
<p>Video sequences were exported as uncompressed audio-video interleaved (AVI) files (30 frames per second). Images were exported out of the created AVI files and saved in tagged image file (TIF; resolution 640×480) format. Position measurements were performed using ImageJ (<ext-link ext-link-type="uri" xlink:href="http://imagej.nih.gov/ij">http://imagej.nih.gov/ij</ext-link>
).<xref rid="b11-opth-8-1361" ref-type="bibr">11</xref>
Only images with clearly delimited pupil and lens margins were included. For measurements of maximal lens deviations only video-frames with the peak of movements (backshoots and overshoots)<xref rid="b12-opth-8-1361" ref-type="bibr">12</xref>
were used. The center of the pupil was estimated by adapting a circle within the pupil and defining its centroid. With the same method, the centroid of the lens optic was measured. Afterward, the distance and angle between the center of the lens and the center of the pupil were measured for all positions for frontal and end-point positions (<xref ref-type="fig" rid="f3-opth-8-1361">Figure 3</xref>
).</p>
<p>The collected data were descriptively analyzed using a statistical program (JMP 10.0; SAS Institute Inc., Cary, NC, USA). All data were anonymously analyzed in accordance with the strict German directives on information security and data protection. Written informed consent was obtained from all patients before the examination. The investigation followed the tenets of the Declaration of Helsinki. Approval of the local ethics committee (Tübingen) was obtained in advance.</p>
</sec>
<sec sec-type="results"><title>Results</title>
<p>In this pilot study, two eyes from each of five patients (median age 32 years, range 28–45 years) were included. For further patient characteristics, see <xref ref-type="table" rid="t2-opth-8-1361">Table 2</xref>
. All patients had undergone refractive surgery because of myopia or astigmatism. No other abnormalities (eg, glaucoma, lens pseudoexfoliation) existed at the time of surgery or study examination. No patients reported shaking images. The high-speed camera showed good functionality. In all cases, high-speed imaging was possible, and there were no resulting problems due to reflections or blurry images. In two patients, positions 3 and 4 were not sufficiently observable due to a small palpebral fissure.</p>
<p>In the primary eye position, except in one eye (ASIOL), all lenses were positioned lower (negative <italic>y</italic>
-values) in relation to the center of the pupils, with a median of −0.32 mm (range −0.69 to 0.024) (<xref ref-type="fig" rid="f4-opth-8-1361">Figure 4</xref>
). Subanalysis of different lens models showed a median distance downward of −0.51 mm (range −0.69 to −0.33) for the Artiflex<sup>®</sup>
, −0.34 mm (range −0.47 to −0.12) for the Artisan<sup>®</sup>
, and −0.18 mm for one of two Cachet<sup>®</sup>
(second one 0.024 mm upward). The median deviation in the lateral direction was 0.175 mm (range −0.37 to 0.45). The median absolute distance and angle between the center points were 0.373 mm (range 0.221–0.742) and −76.143° (range −149° to 5.711°), respectively.</p>
<p>The median distance amplitude of movements that were measured in positions 1–12 was 0.158 mm (range 0.02–0.84 mm) (<xref ref-type="fig" rid="f5-opth-8-1361">Figure 5</xref>
). Subanalysis of different lens models showed a median distance amplitude of 0.183 mm (range 0.04–0.84 mm) for the Artiflex<sup>®</sup>
, 0.15 mm (range 0.02–0.47 mm) for the Artisan<sup>®</sup>
, and 0.16 mm (range 0.03–0.44 mm) for the Cachet<sup>®</sup>
. There was a positive correlation (<italic>r</italic>
=0.39, <italic>P</italic>
<0.001) between the distance of the optic center from the pupil center in the primary position and the grade of the distance increase triggered by movements.</p>
<p>Simplifying the different positions only to middle positions (codes 1–8) and end positions (codes 9–12) for all lens types resulted in a median distance amplitude of movements of 0.14 mm (range 0.02–0.70 mm) and 0.18 mm (range 0.03–0.84 mm), respectively (<xref ref-type="fig" rid="f6-opth-8-1361">Figure 6</xref>
). The median change of the angles was 3.96° (range −105.72° to 69.75°), which showed a negative correlation (−0.3) with median distance amplitude over all lens types.</p>
</sec>
<sec sec-type="discussion"><title>Discussion</title>
<p>In this pilot study, we were able to discover the function of a slit lamp-mounted high-speed camera system and a subsequent morphometry of images to record kinetic influences on the position of ICIOLs and ASIOLs in phakic eyes. Measurement of varying ICIOL and ASIOL positions was feasible in fast direction changes and at lateral end points.</p>
<p>PIOLs are reversible,<xref rid="b13-opth-8-1361" ref-type="bibr">13</xref>
maintain accommodation,<xref rid="b14-opth-8-1361" ref-type="bibr">14</xref>
and are used in patients with high refractive errors or in cases with contraindications for corneal refractive procedures (eg, thinned cornea, scotopic pupil size).<xref rid="b1-opth-8-1361" ref-type="bibr">1</xref>
,<xref rid="b15-opth-8-1361" ref-type="bibr">15</xref>
There are several known possible complications with PIOLs (eg, corneal endothelial cell loss, elevation of intraocular pressure)<xref rid="b16-opth-8-1361" ref-type="bibr">16</xref>
,<xref rid="b17-opth-8-1361" ref-type="bibr">17</xref>
that can be related to their position within the eye segments.<xref rid="b18-opth-8-1361" ref-type="bibr">18</xref>
Based on these complications, many investigations measured the location of ICIOLs<xref rid="b5-opth-8-1361" ref-type="bibr">5</xref>
,<xref rid="b9-opth-8-1361" ref-type="bibr">9</xref>
,<xref rid="b15-opth-8-1361" ref-type="bibr">15</xref>
and ASIOLs<xref rid="b4-opth-8-1361" ref-type="bibr">4</xref>
,<xref rid="b19-opth-8-1361" ref-type="bibr">19</xref>
and their physiological effects. Examination techniques like optical coherence tomography, biometry, or Scheimpflug imaging do not allow the recording of short-term position changes that can appear based on kinetic effects during fast eye movements. Cheng et al,<xref rid="b20-opth-8-1361" ref-type="bibr">20</xref>
Jacobs et al,<xref rid="b21-opth-8-1361" ref-type="bibr">21</xref>
and Miller and Doane<xref rid="b10-opth-8-1361" ref-type="bibr">10</xref>
demonstrated the movements of IOLs using high-speed-imaging, but not in phakic individuals and only after short-distance eye movements. As far as the authors know, position-determining investigations of PIOLs have been performed in various positions<xref rid="b9-opth-8-1361" ref-type="bibr">9</xref>
or during accommodation,<xref rid="b14-opth-8-1361" ref-type="bibr">14</xref>
,<xref rid="b19-opth-8-1361" ref-type="bibr">19</xref>
,<xref rid="b22-opth-8-1361" ref-type="bibr">22</xref>
but not during fast eye movements.</p>
<p>Despite the small case series, we tried not to lump all lens types together, and tried a careful analysis of subgroups. The subsequent analysis of the selected “peak lens deviation” freeze images within our small series to evaluate technical feasibility showed a low-lying lens position relative to the pupil center in nine of ten eyes. Possible causes for these observations are implantation position, looseness of the iris or fixation points, shifting haptic phenomenon,<xref rid="b23-opth-8-1361" ref-type="bibr">23</xref>
and gravity forces “pulling” the lenses to negative vertical values. Also, other investigations described decentrations of ICIOL models. Menezo et al<xref rid="b24-opth-8-1361" ref-type="bibr">24</xref>
reported decentrations of up to 1 mm, while Pérez-Santonja et al<xref rid="b25-opth-8-1361" ref-type="bibr">25</xref>
described a decentration greater than 0.5 mm in 14 (43%) of 32 eyes for Worst–Fechner ICIOLs.</p>
<p>Although the median amplitude over all measured lenses was low, our investigation showed explicit differences for single lenses. Moreover, we could see that higher movement amplitudes could be expected the higher the distance between the lens center and the pupil center at the primary position. But facing the small case numbers, we have to be careful in drawing conclusions. Causes for higher amplitudes in end positions could be loose fixations or increasing kinetic effects in cases of forceful accelerations or decelerations. Furthermore, motions of the pupil, as reported by Nyström et al<xref rid="b26-opth-8-1361" ref-type="bibr">26</xref>
could have influenced our observations. An alternative method to define reference coordinates for deviation measurements could be seen in using Purkinje images. With this method also, movements of the natural lens in normal subjects could be observed.<xref rid="b27-opth-8-1361" ref-type="bibr">27</xref>
</p>
<p>We demonstrated the feasibility of our video-capturing setting using a slit lamp-mounted high-speed camera for dynamic observations of short-term lens movements in all investigated patients and in various positions of the eyes. Following our first analysis with a reduced number of patients, further measurements with our high-speed system seem to be reasonable to detect lens positions and movements in more cases and with a prolonged follow-up time, and to test parameters like interobserver agreement or correlations of lens movements and anterior chamber morphology. Hereafter, the system could be used, eg, to do further investigations of lens stability in patients with unexplained endothelial cell loss.</p>
<sec><title>Limitations</title>
<p>The number of patients in our feasibility investigations does not allow any further statistical calculations or conclusions for diverse lens designs. Also, although the nonstandardized pupil had a limiting effect, we opted not to influence pupil movements (eg, with atropine, pilocarpine) to avoid effects on the mounting of the lens haptics of ICIOLs. Furthermore, motions of the pupils and their center could have interfered with our measurements, and with higher case numbers differences between horizontal, vertical, or oblique saccades should be evaluated.</p>
</sec>
</sec>
<sec><title>Conclusion</title>
<p>With the use of a simple slit lamp-mounted high-speed camera system, the dynamic observation of movements of ICIOLs and ASIOLs is possible. The images allow detailed measurements of lens movements in various positions. Slight decentration in the primary position might be an indicator of increased lens mobility during kinetic stress during eye movements. With the small case numbers, further investigations within a bigger population are planned. Long-term assessment by high-speed analysis has to clarify the relationship between progressing motility and endothelial cell damage.</p>
</sec>
</body>
<back><ack><title>Acknowledgments</title>
<p>Many thanks to Dieter Schwenkel and his team from Imaging Solutions (Eningen, Germany) for the great technical assistance. We acknowledge support by Deutsche Forschungsgemeinschaft and the Open Access Publishing Fund of Tübingen University.</p>
</ack>
<fn-group><fn><p><bold>Disclosure</bold>
</p>
<p>The authors report no conflicts of interest in this work.</p>
</fn>
</fn-group>
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<floats-group><fig id="f1-opth-8-1361" position="float"><label>Figure 1</label>
<caption><p>Schematic drawing of camera positions while video capturing side glance to the right (<bold>A</bold>
), primary position (<bold>B</bold>
), and side glance to the left (<bold>C</bold>
) for analysis of the right eye.</p>
</caption>
<graphic xlink:href="opth-8-1361Fig1"></graphic>
</fig>
<fig id="f2-opth-8-1361" position="float"><label>Figure 2</label>
<caption><p>Images of different positions with overlays of the pupil shape and lens positions.</p>
<p><bold>Notes:</bold>
The numbers on the pictures denote the position and the colored markings on the overlays signify as follows: green, lens borders; big red circle, lens optic; small red circle, pupil margin; yellow circle, lens optic in primary position; cross-hairs, mark the deviation between centroid of pupil and lens optic.</p>
</caption>
<graphic xlink:href="opth-8-1361Fig2"></graphic>
</fig>
<fig id="f3-opth-8-1361" position="float"><label>Figure 3</label>
<caption><p>Scheme of measurement conventions.</p>
<p><bold>Notes:</bold>
Measurements of the deviation direction followed the green sketched graduation. The red and yellow circles mark the borders of the pupil and of the lens optic. The blue line marks the distance between the centers of the pupil and lens optic.</p>
</caption>
<graphic xlink:href="opth-8-1361Fig3"></graphic>
</fig>
<fig id="f4-opth-8-1361" position="float"><label>Figure 4</label>
<caption><p>Positions of the lens center in relation to the pupil center.</p>
<p><bold>Notes:</bold>
The x-axis shows the distance in the horizontal direction (mm), the y-axis shows the distance in the vertical direction (mm).</p>
</caption>
<graphic xlink:href="opth-8-1361Fig4"></graphic>
</fig>
<fig id="f5-opth-8-1361" position="float"><label>Figure 5</label>
<caption><p>Median distance amplitudes in millimeters (y-axis) of the lenses in different positions (x-axis) in relation to the primary position.</p>
<p><bold>Notes:</bold>
Box-and-whisker plots show 5% and 95% quartiles (whiskers), 25% and 75% quartiles (box), and the median (marked by a line).</p>
</caption>
<graphic xlink:href="opth-8-1361Fig5"></graphic>
</fig>
<fig id="f6-opth-8-1361" position="float"><label>Figure 6</label>
<caption><p>Median distance amplitudes in millimeters (y-axis) of the lenses in middle positions (codes 1–8) and end positions (codes 9–12) (x-axis).</p>
<p><bold>Notes:</bold>
Box-and-whisker plots show 5% and 95% quartiles (whiskers), 25% and 75% quartiles (box), and the median (marked by a line).</p>
</caption>
<graphic xlink:href="opth-8-1361Fig6"></graphic>
</fig>
<table-wrap id="t1-opth-8-1361" position="float"><label>Table 1</label>
<caption><p>Measurement positions and their defined coding</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" valign="top" rowspan="1" colspan="1">Code</th>
<th align="left" valign="top" rowspan="1" colspan="1">Position</th>
</tr>
</thead>
<tbody><tr><td align="left" valign="top" rowspan="1" colspan="1"> 0</td>
<td align="left" valign="top" rowspan="1" colspan="1">Primary position</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1"> 1</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion from the primary position to the bottom</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1"> 2</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion from the bottom to the primary position</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1"> 3</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion from the primary position to the top</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1"> 4</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion from the top to the primary position</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1"> 5</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion from the primary position to the right</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1"> 6</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion from the right to the primary position</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1"> 7</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion from the primary position to the left</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1"> 8</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion from the left to the primary position</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1"> 9</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion to the right end position</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1">10</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion outgoing from the right end position</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1">11</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion to the left end position</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1">12</td>
<td align="left" valign="top" rowspan="1" colspan="1">Motion outgoing from the left end position</td>
</tr>
</tbody>
</table>
</table-wrap>
<table-wrap id="t2-opth-8-1361" position="float"><label>Table 2</label>
<caption><p>Patient characteristics</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" valign="top" rowspan="1" colspan="1">ID</th>
<th align="left" valign="top" rowspan="1" colspan="1">Sex</th>
<th align="left" valign="top" rowspan="1" colspan="1">Age (years)</th>
<th align="left" valign="top" rowspan="1" colspan="1">Years since surgery</th>
<th align="left" valign="top" rowspan="1" colspan="1">Lens model</th>
<th align="left" valign="top" rowspan="1" colspan="1">Optic diameter (mm)</th>
<th align="left" valign="top" rowspan="1" colspan="1">Lentodonesis<xref ref-type="table-fn" rid="tfn1-opth-8-1361">*</xref>
</th>
</tr>
</thead>
<tbody><tr><td align="left" valign="top" rowspan="1" colspan="1">1</td>
<td align="left" valign="top" rowspan="1" colspan="1">F</td>
<td align="left" valign="top" rowspan="1" colspan="1">43</td>
<td align="left" valign="top" rowspan="1" colspan="1">6</td>
<td align="left" valign="top" rowspan="1" colspan="1">Artisan<sup>®</sup>
toric</td>
<td align="left" valign="top" rowspan="1" colspan="1">5</td>
<td align="left" valign="top" rowspan="1" colspan="1">1</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1">2</td>
<td align="left" valign="top" rowspan="1" colspan="1">M</td>
<td align="left" valign="top" rowspan="1" colspan="1">32</td>
<td align="left" valign="top" rowspan="1" colspan="1">4</td>
<td align="left" valign="top" rowspan="1" colspan="1">Artisan<sup>®</sup>
</td>
<td align="left" valign="top" rowspan="1" colspan="1">6</td>
<td align="left" valign="top" rowspan="1" colspan="1">0</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1">3</td>
<td align="left" valign="top" rowspan="1" colspan="1">M</td>
<td align="left" valign="top" rowspan="1" colspan="1">28</td>
<td align="left" valign="top" rowspan="1" colspan="1">6</td>
<td align="left" valign="top" rowspan="1" colspan="1">Artiflex<sup>®</sup>
</td>
<td align="left" valign="top" rowspan="1" colspan="1">6</td>
<td align="left" valign="top" rowspan="1" colspan="1">1</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1">4</td>
<td align="left" valign="top" rowspan="1" colspan="1">M</td>
<td align="left" valign="top" rowspan="1" colspan="1">32</td>
<td align="left" valign="top" rowspan="1" colspan="1">6</td>
<td align="left" valign="top" rowspan="1" colspan="1">Artisan<sup>®</sup>
toric</td>
<td align="left" valign="top" rowspan="1" colspan="1">5</td>
<td align="left" valign="top" rowspan="1" colspan="1">0</td>
</tr>
<tr><td align="left" valign="top" rowspan="1" colspan="1">5</td>
<td align="left" valign="top" rowspan="1" colspan="1">F</td>
<td align="left" valign="top" rowspan="1" colspan="1">45</td>
<td align="left" valign="top" rowspan="1" colspan="1">3</td>
<td align="left" valign="top" rowspan="1" colspan="1">Cachet<sup>®</sup>
</td>
<td align="left" valign="top" rowspan="1" colspan="1">6</td>
<td align="left" valign="top" rowspan="1" colspan="1">0</td>
</tr>
</tbody>
</table>
<table-wrap-foot><fn><p><bold>Notes:</bold>
</p>
</fn>
<fn id="tfn1-opth-8-1361"><label>*</label>
<p>0, none; 1, slight; 2, obvious.</p>
</fn>
<fn id="tfn2-opth-8-1361"><p>Artisan<sup>®</sup>
(Ophthec, Groningen, the Netherlands); Cachet<sup>®</sup>
(Novartis International AG, Basel, Switzerland); Artiflex<sup>®</sup>
, (Ophthec, Groningen, the Netherlands).</p>
</fn>
<fn id="tfn3-opth-8-1361"><p><bold>Abbreviations:</bold>
F, female; M, male.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</floats-group>
</pmc>
</record>
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