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Presentation typeOB - oral
TitleOptimized A-constant for a particular lens (XL-Stabi ZO, Carl Zeiss Meditec) and general avice for optimization and IOL calculations formulas
PurposeTo evaluate the efficacy of the Constant A given by the manufacturer of an aspheric IOL: evaluation of the difference between the subjective spherical equivalent 3 months post surgery and the target refraction.
Methods260 eyes from 8 surgical centers were enrolled in this study: 247 eyes received the study lens (XL Stabi ZO, Carl Zeiss Meditec). SRK/T formula was used in 71.7% of the cases.
Patients were divided in 3 groups: short eyes (axial length (AL) < 22mm, normal eyes (22mm25mm).
Data were collected at 1M and 3M.
Deviation from intended refraction was calculated in all cases.
ResultsThe main efficacy criterion, the evaluation of the difference between the subjective spherical equivalent at 3M and the target refraction showed a slight undercorrection, with a mean value of -0.30D (SD: 0.61). In the short eyes group, -0.43D (SD: 0.76); in the normal eyes group -0.26D (SD: 0.56); in the long eyes group 0.36D (SD: 0.61).
ConclusionThe A Constant for the XL Stabi ZO should be adapted for short and long eyes, or another Formula should be used.
Author 1
Last nameMATHYS
InitialsB
DepartmentBrussels Eye Specialists
CityBrussels
Author 2
Last nameALIO
InitialsJ
DepartmentInstituto Oftalmologico de Alicante, Vissum Corporation
CityAlicante, Spain
Author 3
Last nameMORBELLI
InitialsH
DepartmentInstituto Oftalmologico de Albacete, Vissum Corporation (Department of Refractive Surgery and Catara
CityAlbacete, Spain
Author 4
Last nameLEBRUN
InitialsT
DepartmentClinique du Landy
CitySaint Ouen, France
Author 5
Last nameKHAITRINE
InitialsL
DepartmentClinique de Courlancy
City Reims, France
Author 6
Last nameRIECK
InitialsP
DepartmentCharité - Universitätsmedizin Berlin
CityBerlin, Germany
Author 7
Last nameDEWILDE
InitialsF
DepartmentEye Center Latem
CitySint Martens Latem
Author 8
Last nameTRABUCCHI
InitialsT
DepartmentOspedale di Legnano
CityLegnano, Italy
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