Effects of intraocular lenses with different diopters on chromatic aberrations in human eye models.

Hui Song,Xiaoyong Yuan,Xin Tang

doi:10.1186/s12886-016-0184-6

Abstract

BackgroundIn this study, the effects of intraocular lenses (IOLs) with different diopters (D) on chromatic aberration were investigated in human eye models, and the influences of the central thickness of IOLs on chromatic aberration were compared.MethodsA Liou-Brennan-based IOL eye model was constructed using ZEMAX optical design software. Spherical IOLs with different diopters (AR40e, AMO Company, USA) were implanted; modulation transfer function (MTF) values at 3 mm of pupil diameter and from 0 to out-of-focus blur were collected and graphed.ResultsMTF values, measured at 555 nm of monochromatic light under each spatial frequency, were significantly higher than the values measured at 470 to 650 nm of polychromatic light. The influences of chromatic aberration on MTF values decreased with the increase in IOL diopter when the spatial frequency was ≤12 c/d, while increased effects were observed when the spatial frequency was ≥15 c/d. The MTF values of each IOL eye model were significantly lower than the MTF values of the Liou-Brennan eye models when measured at 555 nm of monochromatic light and at 470 to 650 nm of polychromatic light. The MTF values were also found to be increased with the increase in IOL diopter.ConclusionWith higher diopters of IOLs, the central thickness increased accordingly, which could have created increased chromatic aberration and decreased the retinal image quality. To improve the postoperative visual quality, IOLs with lower chromatic aberration should be selected for patients with short axial lengths.

Highlights

In this study, the effects of intraocular lenses (IOLs) with different diopters (D) on chromatic aberration were investigated in human eye models, and the influences of the central thickness of IOLs on chromatic aberration were compared
The differences between the modulation transfer function (MTF) values that were measured under monochromatic (555 nm) and polychromatic (470–650 nm) light increased with the IOL diopter (Fig. 3a–e)
We found that the A-value increased with the spatial frequencies (SFs), indicating the increased influence of chromatic aberration on MTF values (Table 3)

Summary

Introduction

The effects of intraocular lenses (IOLs) with different diopters (D) on chromatic aberration were investigated in human eye models, and the influences of the central thickness of IOLs on chromatic aberration were compared. Recent studies have demonstrated that correcting monochromatic aberrations and chromatic aberrations at the same time could improve visual acuity and contrast. In Weeber’s study, subjects were implanted with an IOL correcting both LCA and spherical aberration (SA) in one eye and an IOL correcting only SA in the fellow eye. This study included a small number of subjects, it showed a tendency for better visual performance in the eyes where both aberrations were corrected [6]. Considering that the LCA causes a substantial defocus over the visible range of about 2 diopters (D), the additional correction of this aberration should

Methods

Results

Discussion

Conclusion