Dolce Jackson C, Nti Augustine N, Berntsen David A
University of Houston College of Optometry, Houston, Texas.
Optom Vis Sci. 2025 Jul 1;102(7):421-426. doi: 10.1097/OPX.0000000000002271. Epub 2025 Jun 12.
Multifocal contact lenses have been shown to slow myopia progression in children. Understanding their impact on visual performance is important. While these lenses have little effect on high-contrast visual acuity, they reduce low-contrast visual acuity and contrast sensitivity, with these reductions being greater as pupil size increases.
This study aimed to determine the effect of pupil size on visual performance with center-distance multifocal contact lenses used for myopia control.
Twenty-four myopic, nonpresbyopic adults were fitted with a single vision (Biofinity) and a center-distance multifocal (Biofinity D +2.50 add) contact lens, in random order. The pupil was dilated, and visual acuity (high and low contrast) and contrast sensitivity were measured through a 3 and 6 mm aperture.
Visual acuity differed by contrast level and depended on lens design and pupil size (p=0.0040). With both pupil sizes, high-contrast acuity with the multifocal lens was only two letters worse than with the single vision lens (p=0.0001). Lens design effects on low-contrast acuity were pupil size-dependent (p=0.0006). Compared with single vision lenses, low-contrast acuity with multifocal lenses was about three letters worse for a 3 mm pupil (mean ± standard error of the mean = 0.07 ± 0.02 logMAR, p=0.0010) and about two lines worse with a 6 mm pupil (0.19 ± 0.02 logMAR; p<0.001). While wearing the multifocal lens, low-contrast acuity decreased by nearly two lines when pupil size increased from 3 to 6 mm (0.17 ± 0.02 logMAR; p<0.0001). The effect of lens design on the area under the log contrast sensitivity function was pupil-size-dependent (p=0.024). When compared with a 3 mm pupil, the greatest reduction in area under the log contrast sensitivity function at the larger 6 mm pupil size was with the multifocal lens, causing a 17% decrease compared with a 9% decrease for the single vision lens (p<0.0001).
Multifocal contact lenses perform similarly to single vision lenses under high-contrast and smaller pupil conditions; however, visual performance reductions increase with lower contrast and a larger pupil size.
多焦点隐形眼镜已被证明可减缓儿童近视进展。了解它们对视觉性能的影响很重要。虽然这些镜片对高对比度视力影响不大，但它们会降低低对比度视力和对比敏感度，且随着瞳孔大小增加，这些降低幅度会更大。
本研究旨在确定瞳孔大小对用于近视控制的中心距多焦点隐形眼镜视觉性能的影响。
24名近视、非老花眼成年人被随机顺序佩戴单焦点（Biofinity）和中心距多焦点（Biofinity D +2.50附加光度）隐形眼镜。瞳孔被散瞳，通过3毫米和6毫米孔径测量视力（高对比度和低对比度）以及对比敏感度。
视力因对比度水平而异，并取决于镜片设计和瞳孔大小（p = 0.0040）。在两种瞳孔大小下，多焦点镜片的高对比度视力仅比单焦点镜片差两个字母（p = 0.0001）。镜片设计对低对比度视力的影响取决于瞳孔大小（p = 0.0006）。与单焦点镜片相比，对于3毫米瞳孔，多焦点镜片的低对比度视力大约差三个字母（平均值±平均标准误差 = 0.07±0.02 logMAR，p = 0.0010），对于6毫米瞳孔则大约差两行（0.19±0.02 logMAR；p < 0.001）。佩戴多焦点镜片时，当瞳孔大小从3毫米增加到6毫米时，低对比度视力下降近两行（0.17±0.02 logMAR；p < 0.0001）。镜片设计对对数对比敏感度函数下面积的影响取决于瞳孔大小（p = 0.024）。与3毫米瞳孔相比，在较大的6毫米瞳孔大小时，对数对比敏感度函数下面积最大的降低是多焦点镜片，与单焦点镜片9%的降低相比，降低了17%（p < 0.0001）。
在高对比度和较小瞳孔条件下，多焦点隐形眼镜的表现与单焦点隐形眼镜相似；然而，随着对比度降低和瞳孔大小增大，视觉性能下降会增加。
