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Clinical application of the lens haptic plane concept with transformed axial lengths

Identifieur interne : 000E58 ( PascalFrancis/Corpus ); précédent : 000E57; suivant : 000E59

Clinical application of the lens haptic plane concept with transformed axial lengths

Auteurs : Sverker Norrby ; Eva Lydahl ; Gabor Koranyi ; Mikaela Taube

Source :

RBID : Pascal:05-0399248

Descripteurs français

English descriptors

Abstract

Purpose: To clinically evaluate the lens haptic plane (LHP) concept in combination with thick-lens ray tracing for intraocular lens (IOL) power calculation. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: Prospective study of normal cataract cases implanted with Pharmacia CeeOn 809C IOL. Axial length was measured by A-scan. The measured value was first transformed by addition of a constant value to correct for systematic error. Using the transformed axial length and corneal radius measured by keratometry, the LHP position was determined. Knowing the IOL design and the power implanted, expected refractive outcome was calculated and compared to manifest refraction at 6 weeks in terms of mean absolute error (MAE). Thick-lens ray tracing in the paraxial limit was used for the optical calculation. Results: The mean transformed axial length was 23.87 mm. An LHP position algorithm in linear terms of transformed axial length and corneal radius gave an MAE of 0.38 D. There was no trend with axial length. On the present data, the Holladay 1, Hoffer Q, and SRK/T formulas produced MAEs of 0.39 D, 0.39 D, and 0.41 D, respectively, with optimized formula constants. The differences were not statistically significant (P>.05). Conclusions: The LHP concept in combination with thick-lens ray tracing achieved MAE comparable to that with currently used formulas. The lack of trend with axial length is important for patients with short and long eyes.

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Pour connaître la documentation sur le format Inist Standard.

pA  
A01 01  1    @0 0886-3350
A02 01      @0 JCSUEV
A03   1    @0 J. cataract refractive surg.
A05       @2 31
A06       @2 7
A08 01  1  ENG  @1 Clinical application of the lens haptic plane concept with transformed axial lengths
A11 01  1    @1 NORRBY (Sverker)
A11 02  1    @1 LYDAHL (Eva)
A11 03  1    @1 KORANYI (Gabor)
A11 04  1    @1 TAUBE (Mikaela)
A14 01      @1 AMO Groningen BV @2 Groningen @3 NLD @Z 1 aut.
A14 02      @1 St. Erik's Eye Hospital @2 Stockholm @3 SWE @Z 2 aut. @Z 3 aut. @Z 4 aut.
A20       @1 1338-1344
A21       @1 2005
A23 01      @0 ENG
A43 01      @1 INIST @2 20937 @5 354000131572020110
A44       @0 0000 @1 © 2005 INIST-CNRS. All rights reserved.
A45       @0 22 ref.
A47 01  1    @0 05-0399248
A60       @1 P
A61       @0 A
A64 01  1    @0 Journal of cataract and refractive surgery
A66 01      @0 USA
C01 01    ENG  @0 Purpose: To clinically evaluate the lens haptic plane (LHP) concept in combination with thick-lens ray tracing for intraocular lens (IOL) power calculation. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: Prospective study of normal cataract cases implanted with Pharmacia CeeOn 809C IOL. Axial length was measured by A-scan. The measured value was first transformed by addition of a constant value to correct for systematic error. Using the transformed axial length and corneal radius measured by keratometry, the LHP position was determined. Knowing the IOL design and the power implanted, expected refractive outcome was calculated and compared to manifest refraction at 6 weeks in terms of mean absolute error (MAE). Thick-lens ray tracing in the paraxial limit was used for the optical calculation. Results: The mean transformed axial length was 23.87 mm. An LHP position algorithm in linear terms of transformed axial length and corneal radius gave an MAE of 0.38 D. There was no trend with axial length. On the present data, the Holladay 1, Hoffer Q, and SRK/T formulas produced MAEs of 0.39 D, 0.39 D, and 0.41 D, respectively, with optimized formula constants. The differences were not statistically significant (P>.05). Conclusions: The LHP concept in combination with thick-lens ray tracing achieved MAE comparable to that with currently used formulas. The lack of trend with axial length is important for patients with short and long eyes.
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C03 01  X  FRE  @0 Application médicale @5 02
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C03 01  X  SPA  @0 Aplicación medical @5 02
C03 02  X  FRE  @0 Cristallin @5 03
C03 02  X  ENG  @0 Lens @5 03
C03 02  X  SPA  @0 Cristalino @5 03
C03 03  X  FRE  @0 Plan @5 05
C03 03  X  ENG  @0 Plane @5 05
C03 03  X  SPA  @0 Plano @5 05
C03 04  X  FRE  @0 Chirurgie @5 06
C03 04  X  ENG  @0 Surgery @5 06
C03 04  X  SPA  @0 Cirugía @5 06
C03 05  X  FRE  @0 Ophtalmologie @5 08
C03 05  X  ENG  @0 Ophthalmology @5 08
C03 05  X  SPA  @0 Oftalmología @5 08
C03 06  X  FRE  @0 Traitement @5 25
C03 06  X  ENG  @0 Treatment @5 25
C03 06  X  SPA  @0 Tratamiento @5 25
N21       @1 276
N44 01      @1 OTO
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Format Inist (serveur)

NO : PASCAL 05-0399248 INIST
ET : Clinical application of the lens haptic plane concept with transformed axial lengths
AU : NORRBY (Sverker); LYDAHL (Eva); KORANYI (Gabor); TAUBE (Mikaela)
AF : AMO Groningen BV/Groningen/Pays-Bas (1 aut.); St. Erik's Eye Hospital/Stockholm/Suède (2 aut., 3 aut., 4 aut.)
DT : Publication en série; Niveau analytique
SO : Journal of cataract and refractive surgery; ISSN 0886-3350; Coden JCSUEV; Etats-Unis; Da. 2005; Vol. 31; No. 7; Pp. 1338-1344; Bibl. 22 ref.
LA : Anglais
EA : Purpose: To clinically evaluate the lens haptic plane (LHP) concept in combination with thick-lens ray tracing for intraocular lens (IOL) power calculation. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: Prospective study of normal cataract cases implanted with Pharmacia CeeOn 809C IOL. Axial length was measured by A-scan. The measured value was first transformed by addition of a constant value to correct for systematic error. Using the transformed axial length and corneal radius measured by keratometry, the LHP position was determined. Knowing the IOL design and the power implanted, expected refractive outcome was calculated and compared to manifest refraction at 6 weeks in terms of mean absolute error (MAE). Thick-lens ray tracing in the paraxial limit was used for the optical calculation. Results: The mean transformed axial length was 23.87 mm. An LHP position algorithm in linear terms of transformed axial length and corneal radius gave an MAE of 0.38 D. There was no trend with axial length. On the present data, the Holladay 1, Hoffer Q, and SRK/T formulas produced MAEs of 0.39 D, 0.39 D, and 0.41 D, respectively, with optimized formula constants. The differences were not statistically significant (P>.05). Conclusions: The LHP concept in combination with thick-lens ray tracing achieved MAE comparable to that with currently used formulas. The lack of trend with axial length is important for patients with short and long eyes.
CC : 002B25B
FD : Application médicale; Cristallin; Plan; Chirurgie; Ophtalmologie; Traitement
ED : Medical application; Lens; Plane; Surgery; Ophthalmology; Treatment
SD : Aplicación medical; Cristalino; Plano; Cirugía; Oftalmología; Tratamiento
LO : INIST-20937.354000131572020110
ID : 05-0399248

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Le document en format XML

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<div type="abstract" xml:lang="en">Purpose: To clinically evaluate the lens haptic plane (LHP) concept in combination with thick-lens ray tracing for intraocular lens (IOL) power calculation. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: Prospective study of normal cataract cases implanted with Pharmacia CeeOn 809C IOL. Axial length was measured by A-scan. The measured value was first transformed by addition of a constant value to correct for systematic error. Using the transformed axial length and corneal radius measured by keratometry, the LHP position was determined. Knowing the IOL design and the power implanted, expected refractive outcome was calculated and compared to manifest refraction at 6 weeks in terms of mean absolute error (MAE). Thick-lens ray tracing in the paraxial limit was used for the optical calculation. Results: The mean transformed axial length was 23.87 mm. An LHP position algorithm in linear terms of transformed axial length and corneal radius gave an MAE of 0.38 D. There was no trend with axial length. On the present data, the Holladay 1, Hoffer Q, and SRK/T formulas produced MAEs of 0.39 D, 0.39 D, and 0.41 D, respectively, with optimized formula constants. The differences were not statistically significant (P>.05). Conclusions: The LHP concept in combination with thick-lens ray tracing achieved MAE comparable to that with currently used formulas. The lack of trend with axial length is important for patients with short and long eyes.</div>
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<ET>Clinical application of the lens haptic plane concept with transformed axial lengths</ET>
<AU>NORRBY (Sverker); LYDAHL (Eva); KORANYI (Gabor); TAUBE (Mikaela)</AU>
<AF>AMO Groningen BV/Groningen/Pays-Bas (1 aut.); St. Erik's Eye Hospital/Stockholm/Suède (2 aut., 3 aut., 4 aut.)</AF>
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<EA>Purpose: To clinically evaluate the lens haptic plane (LHP) concept in combination with thick-lens ray tracing for intraocular lens (IOL) power calculation. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: Prospective study of normal cataract cases implanted with Pharmacia CeeOn 809C IOL. Axial length was measured by A-scan. The measured value was first transformed by addition of a constant value to correct for systematic error. Using the transformed axial length and corneal radius measured by keratometry, the LHP position was determined. Knowing the IOL design and the power implanted, expected refractive outcome was calculated and compared to manifest refraction at 6 weeks in terms of mean absolute error (MAE). Thick-lens ray tracing in the paraxial limit was used for the optical calculation. Results: The mean transformed axial length was 23.87 mm. An LHP position algorithm in linear terms of transformed axial length and corneal radius gave an MAE of 0.38 D. There was no trend with axial length. On the present data, the Holladay 1, Hoffer Q, and SRK/T formulas produced MAEs of 0.39 D, 0.39 D, and 0.41 D, respectively, with optimized formula constants. The differences were not statistically significant (P>.05). Conclusions: The LHP concept in combination with thick-lens ray tracing achieved MAE comparable to that with currently used formulas. The lack of trend with axial length is important for patients with short and long eyes.</EA>
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