J Korean Ophthalmol Soc.  2013 Dec;54(12):1818-1823.

Comparison of Optical Quality Between Two Intraocular Lenses Using Double-Pass Based Optical Quality Analysis System

• Kwak AY
• Choi M
• Seo KY
• Ahn JM

Abstract

PURPOSE
To compare postoperative optical qualities between two types of 1-piece aspheric intraocular lenses using the double-pass technique.
METHODS
Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), and spherical equivalent were evaluated in the subject groups; the first which included 25 eyes implanted with Tecnis(R) ZCB00 and the second which included 16 eyes implanted with Acrysof(R) IQ SN60WF. In addition, modulation transfer function (MTF) cut-off, Strehl ratio, and objective scattering index (OSI) were measured 6 months after cataract surgery in the 2 subject groups using Optical Quality Analysis System (OQAS, Visiometrics S.L., Terrasa, Barcelona, Spain) which is based on the double-pass technique.
RESULTS
There were no significant differences in the spherical equivalent, UCVA, BCVA, and OSI between the 2 groups. However, both the MTF cut-off, and Strehl ratio showed statistically significant differences. The MTF cut-off (28.0 +/- 7.79 vs. 20.4 +/- 9.51 c/deg, p = 0.025) and Strehl ratio (0.14 +/- 0.04 vs. 0.12 +/- 0.05, p = 0.042) were higher in the Tecnis(R) ZCB00-implanted group.
CONCLUSIONS
The difference in characteristics of intraocular lenses subtly affects the vision quality as measured by values such as MTF cut-off and Strehl ratio after cataract surgery. OQAS based on the double-pass technique is considered useful in more objective estimates of the real retinal image quality after cataract surgery which is difficult to explain simply by measuring visual acuity.

Keyword

Double-pass; Optical Quality Analysis System; Visual quality; 1-piece aspheric intraocular lenses

MeSH Terms

Cataract
Lenses, Intraocular*
Retinaldehyde
Visual Acuity
Retinaldehyde

Figure

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  Figure 1. Experimental diagram of the double-pass system. (AP1 = artificial pupil 1; AP2 = artificial pupil 2; BS = beam splitter; C1 = camera 1; C2 = camera 2; CCD = charge-coupled device; L1, L2, L3, L4, and L5 = lenses 1, 2, 3, 4; FC = focus corrector; BS = beam splitter; PC = per-sonal computer).

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  Figure 2. Comparison of MTF cutoff, Strehl ratio, OSI between the 2 groups measured using OQAS 6 months after operation. MTF = modulation transfer function; OSI = objective scattering index; IOL = intraocular lens.

Reference

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