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Xialin Liu, Yao Ni, Chang He, Li Wang, Yizhi Liu; Macular function contributes to the near vision performance in the patients with monofocal intraocular lens: a functional Multifocal ERG study. Invest. Ophthalmol. Vis. Sci. 2013;54(15):4276.
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To investigate the relationship between macular function and individual near vision performance in normal pseudophakic eyes with monofocal intraocular lens (IOLs).
In this study, 36 eyes after standard phacoemulsification with foldable monofocal IOLs implantation, and a postoperative uncorrected distance visual acuity of 0.8 or better were enrolled. Best corrected distance of visual acuity (BCVA), uncorrected near visual acuity (UNVA) and distance corrected near visual acuity (DCNA) were assessed. Macular function was measured by the multifocal ERG system (VERIS; Electro-Diagnostic Imaging, Inc., Redwood City, CA), with 103 scaled hexagons. The latencies and amplitude densities were analyzed according to 6 concentric ring averages.
All the pseudophakic eyes had a BCVA (logMAR) of 0.00 or better. Typical normal multifocal ERGs were obtained from these eyes. There was a positive correlation between DCNA (logMAR) and latencies of N1 in ring1(r=0.431, p=0.008). Except ring1, the other measures of latencies and average amplitude densities (ring 2-6) from multifocal ERG components were not correlation with DCNA. Additionally, there were no correlations between UNVA (logMAR) and all of the latencies and average amplitude densities.
Ring 1 (ranged from 0-1.5°) represented the fovea which was responsible for sharp central vision.The data from the bipolar cell-dominated multifocal ERG revealed slightly functional differences between the enrolled individuals. A positive correlation between DCNA and latencies of N1 in ring1 implied that the more robust status of macular fovea may contribute to better DCNA. Our finding may offer a new perspective to understand the phenomenon of pseudo-accommodation.
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