HapticV1, Main, Exploration, bibRecord, 000689

Optical performance of toric intraocular lenses in the presence of decentration

Identifieur interne : 000689 ( Main/Exploration ); précédent : 000688; suivant : 000690

Optical performance of toric intraocular lenses in the presence of decentration

Auteurs : Bin Zhang ; Jin-Xue Ma ; Dan-Yan Liu ; Ying-Hua Du ; Cong-Rong Guo ; Yue-Xian Cui

Source :

International Journal of Ophthalmology [ 2222-3959 ] ; 2015.

RBID : PMC:4539640

Abstract

AIM

To evaluate the optical performance of toric intraocular lenses (IOLs) after decentration and with different pupil diameters, but with the IOL astigmatic axis aligned.

METHODS

Optical performances of toric T5 and SN60AT spherical IOLs after decentration were tested on a theoretical pseudophakic model eye based on the Hwey-Lan Liou schematic eye using the Zemax ray-tracing program. Changes in optical performance were analyzed in model eyes with 3-mm, 4-mm, and 5-mm pupil diameters and decentered from 0.25 mm to 0.75 mm with an interval of 5° at the meridian direction from 0° to 90°. The ratio of the modulation transfer function (MTF) between a decentered and a centered IOL (MTF_Decentration/MTF_Centration) was calculated to analyze the decrease in optical performance.

RESULTS

Optical performance of the toric IOL remained unchanged when IOLs were decentered in any meridian direction. The MTFs of the two IOLs decreased, whereas optical performance remained equivalent after decentration. The MTF_Decentration/MTF_Centration ratios of the IOLs at a decentration from 0.25 mm to 0.75 mm were comparable in the toric and SN60AT IOLs. After decentration, MTF decreased further, with the MTF of the toric IOL being slightly lower than that of the SN60AT IOL. Imaging qualities of the two IOLs decreased when the pupil diameter and the degree of decentration increased, but the decrease was similar in the toric and spherical IOLs.

CONCLUSIONS

Toric IOLs were comparable to spherical IOLs in terms of tolerance to decentration at the correct axial position.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4539640

DOI: 10.3980/j.issn.2222-3959.2015.04.16
PubMed: 26309871
PubMed Central: 4539640

Affiliations:

Le document en format XML

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<author><name sortKey="Ma, Jin Xue" sort="Ma, Jin Xue" uniqKey="Ma J" first="Jin-Xue" last="Ma">Jin-Xue Ma</name>
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<author><name sortKey="Liu, Dan Yan" sort="Liu, Dan Yan" uniqKey="Liu D" first="Dan-Yan" last="Liu">Dan-Yan Liu</name>
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<author><name sortKey="Du, Ying Hua" sort="Du, Ying Hua" uniqKey="Du Y" first="Ying-Hua" last="Du">Ying-Hua Du</name>
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<author><name sortKey="Guo, Cong Rong" sort="Guo, Cong Rong" uniqKey="Guo C" first="Cong-Rong" last="Guo">Cong-Rong Guo</name>
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<front><div type="abstract" xml:lang="en"><sec><title>AIM</title>
<p>To evaluate the optical performance of toric intraocular lenses (IOLs) after decentration and with different pupil diameters, but with the IOL astigmatic axis aligned.</p>
</sec>
<sec><title>METHODS</title>
<p>Optical performances of toric T5 and SN60AT spherical IOLs after decentration were tested on a theoretical pseudophakic model eye based on the Hwey-Lan Liou schematic eye using the Zemax ray-tracing program. Changes in optical performance were analyzed in model eyes with 3-mm, 4-mm, and 5-mm pupil diameters and decentered from 0.25 mm to 0.75 mm with an interval of 5° at the meridian direction from 0° to 90°. The ratio of the modulation transfer function (MTF) between a decentered and a centered IOL (MTF<sub>Decentration</sub>
/MTF<sub>Centration</sub>
) was calculated to analyze the decrease in optical performance.</p>
</sec>
<sec><title>RESULTS</title>
<p>Optical performance of the toric IOL remained unchanged when IOLs were decentered in any meridian direction. The MTFs of the two IOLs decreased, whereas optical performance remained equivalent after decentration. The MTF<sub>Decentration</sub>
/MTF<sub>Centration</sub>
 ratios of the IOLs at a decentration from 0.25 mm to 0.75 mm were comparable in the toric and SN60AT IOLs. After decentration, MTF decreased further, with the MTF of the toric IOL being slightly lower than that of the SN60AT IOL. Imaging qualities of the two IOLs decreased when the pupil diameter and the degree of decentration increased, but the decrease was similar in the toric and spherical IOLs.</p>
</sec>
<sec><title>CONCLUSIONS</title>
<p>Toric IOLs were comparable to spherical IOLs in terms of tolerance to decentration at the correct axial position.</p>
</sec>
</div>
</front>
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<name sortKey="Du, Ying Hua" sort="Du, Ying Hua" uniqKey="Du Y" first="Ying-Hua" last="Du">Ying-Hua Du</name>
<name sortKey="Guo, Cong Rong" sort="Guo, Cong Rong" uniqKey="Guo C" first="Cong-Rong" last="Guo">Cong-Rong Guo</name>
<name sortKey="Liu, Dan Yan" sort="Liu, Dan Yan" uniqKey="Liu D" first="Dan-Yan" last="Liu">Dan-Yan Liu</name>
<name sortKey="Ma, Jin Xue" sort="Ma, Jin Xue" uniqKey="Ma J" first="Jin-Xue" last="Ma">Jin-Xue Ma</name>
<name sortKey="Zhang, Bin" sort="Zhang, Bin" uniqKey="Zhang B" first="Bin" last="Zhang">Bin Zhang</name>
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Optical performance of toric intraocular lenses in the presence of decentration

Optical performance of toric intraocular lenses in the presence of decentration

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Abstract

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