Evaluation of the visual field performance of Defocus Incorporated Multiple Segments lenses (DIMS) versus single vision lenses

Abstract

Purpose : The study evaluates if wearing the Defocus Incorporated Multiple Segments (DIMS) lens affects the visual field sensitivity when compare to wearing single vision (SV) lens.

Methods : Twenty-one children aged 9 to 14 years with spherical equivalent refraction (SER) ranged from -1.13D to -4.75D were recruited. Mid-peripheral near visual acuity (VA) under room lighting condition (500 lux ± 10%) was measured using DIMS and SV lenses. Automated static perimetry (Zeiss, Humphrey Visual Field HFA 750i) with SITA Fast 30-2 protocol was used to investigate the visual field sensitivity. During the test, study lenses (Plano DIMS or SV lens) were set into the lens holder of the instrument in front of the trial lenses with the calculated prescription of each child.

Results : Three children failed to complete the reliable visual tests due to high fixation loss (>20%) or high false positive rate (>15%) while eighteen children successfully completed the test. The mean visual field sensitivity was 29.20 ± 3.65 decibels (dB) and 29.30 ± 3.54 dB for wearing DIMS and SV lens. The mean sensitivity differences between DIMS and SV lens among 76 locations ranged from -2.44 ± 3.85 dB to 1.61 ± 3.94 dB. No statistically significant difference in sensitivity was observed across 76 locations within 30^o retinal locations between DIMS and SV lens (Wilcoxon signed rank test with bonferroni correction for multiple comparisons, p<0.00065).
Compared to SV lens, the mid-peripheral near VA was found approximately reduced by 0.06 logarithm of minimal angle of resolution (logMAR) with DIMS lens in all 4 quadrants (All p<0.05). However, no significant correlation was found between the mid-peripheral VA and visual sensitivity.

Conclusions : Although the mid-peripheral near VA was slightly reduced using DIMS lens, wearing DIMS lens did not change the children’s visual sensitivity to detect the static stimulus within 30^o visual field when compared to wearing SV lens.

This abstract was presented at the 2024 ARVO Annual Meeting, held in Seattle, WA, May 5-9, 2024.

 

Figure 1. The mean difference in visual sensitivity at each retinal location within 30-degree eccentricity between DIMS and SV lenses.

 

Figure 2. Comparison of mid-peripheral near VA between DIMS and SV lenses. The data presented inside the ring (Starting from the top, clockwise) indicates the mid-peripheral VA through the superior, temporal, inferior and nasal quadrant, respectively. The near VA was expressed in logMAR. *p<0.05. **p<0.01.