Chromatic Aberration Of Four Extended Depth Of Focus Intraocular Lenses Compared To Monofocal Lenses
Published 2023 - 41st Congress of the ESCRS
Reference: PO0556 | Type: Free paper | DOI: 10.82333/2hbe-5d36
Authors: Gerd Uwe Auffarth* 1 , Antonio del Aguila-Carrasco 2 , Henk Weeber 2 , Aixa Alarcon 2 , Carmen Canovas 2
1Dept. of Ophthalmolgy,University of Heidelberg,Heidelberg,Germany, 2Johnson & Johnson Surgical Vision ,Groningen,Netherlands
Purpose
One important aspect of intraocular lenses (IOLs) is the longitudinal chromatic aberration (LCA) they exhibit or, in other words, the difference in refractive power for different wavelengths. LCA depends upon the dispersion of the IOL material and its design and provides information about the technology of the different IOLs, since LCA is affected in a different manner by refractive and diffractive surfaces.
The purpose of this work was to determine the LCA for distance and intermediate vision of different extended depth of focus (EDOF) IOLs for different pupil sizes. Two monofocal lenses were measured for reference.
Setting
Johnson and Johnson Surgical Vision, AMO Groningen B.V., The Netherlands
Methods
The IOLs assessed were an aspheric monofocal (M), a monofocal that slightly extends depth of focus (MEDOF) and four EDOF IOLs that rely on different optical technologies and materials: EDOF1 is a diffractive lens made of material 1, EDOF2 uses a ‘wavefront shaping’ technology and is made of material 2, EDOF3 is refractive and made of material 3, and EDOF4 is a new refractive lens made of material 1. M and MEDOF are made of material 4. Through-focus modulation transfer function in a model eye with a cornea that reproduces the average SA and LCA of the human cornea were obtained for different wavelengths and different pupil sizes. LCA was calculated as the difference in power between 450 and 650 nm for both distance and intermediate vision.
Results
The maximum change in LCA for distance vision across all pupils was comparable for all lens models (about 0.10 D), except for the diffractive EDOF (EDOF1), that showed a change in LCA of 0.79 D. Regarding intermediate vision, the maximum change in LCA across pupils was 0.10 D for all lenses, except for the diffractive (EDOF1) and wavefront shaping EDOF (EDOF2) IOLs, that showed a change of 0.89 D and 1.40 D, respectively.
Conclusions
LCA remained practically constant for all pupil sizes for refractive IOLs, whereas LCA showed abrupt changes with pupil size for the diffractive IOL (EDOF1) and the IOL based on wavefront shaping technology (EDOF2). Diffractive technology partly compensates for ocular LCA, leading to smaller LCA values. The new EDOF IOL (EDOF4) demonstrated a purely refractive behavior, as its LCA was virtually constant for all pupil sizes.