Billy R Hammond, Jacob B Harth, Lisa M Renzi-Hammond
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引用次数: 0
Abstract
Purpose: To evaluate the visual performance of a blue-light filter (BLF). The following visual parameters were assessed: glare disability (GD); chromatic contrast (CC); two-point light thresholds; and dysphotopsia symptoms (snowball and spoke diameter).
Methods: Twenty-five pseudophakic patients previously implanted with a "UV-only" intraocular lens (IOL) were tested using a single-masked randomized cross-over design. In the control condition, a UV-only filter (matched to the implant) was used. In the test condition, a BLF was used (matching the absorbance profile of a common BLF IOL; Acrysof Natural and Clareon; Alcon Research Ltd). The intensity (expressed as log relative energy, LRE) of broad-band xenon light and a sky-blue background needed to veil a central grating target was used to measure GD and CC, respectively. The diameter of spokes/snowballs was determined by measuring their lateral extent induced by a bright white point source. Two-point light thresholds were measured as the separation between two small relatively intense point sources of light (Rayleigh criterion).
Results: The BLF test lens resulted in improved CC (LRE 2.04 vs 1.83) and GD (LRE = 2.46 vs 2.27, p < 0.001). Snowballs (49 vs 69 mm, p < 0.01) and spoke (139 vs 171, p < 0.001) diameters were also reduced in the BLF condition.
Conclusion: About 6% and 10% more light energy was needed to occlude the grating stimulus for GD and CC. Light spread measured using the two-point technique was about 26% less for the BLF. The BLF reduced snowballs and spokes by about 24% and 19%. The BLF significantly improved function across a variety of visual indices.
目的:评价一种蓝光滤光片(BLF)的视觉性能。评估以下视觉参数:眩光失能(GD);彩色对比;两点光阈值;和呼吸困难症状(雪球和辐条直径)。方法:采用单盲随机交叉设计对25例先前植入“仅紫外线”人工晶状体(IOL)的假性白内障患者进行测试。在对照条件下,使用与植入物匹配的紫外线过滤器。在测试条件下,使用BLF(与普通BLF IOL的吸光度相匹配);acryysof Natural and Clareon;爱尔康研究有限公司)使用宽频带氙光强度(表示为对数相对能量,LRE)和遮挡中心光栅目标所需的天蓝色背景分别测量GD和CC。辐条/雪球的直径是通过测量明亮的白点源引起的辐条/雪球的横向范围来确定的。两点光阈值被测量为两个相对较强的小点光源之间的距离(瑞利准则)。结果:BLF测试透镜改善了CC (LRE = 2.04 vs 1.83)和GD (LRE = 2.46 vs 2.27, p p p p结论:对于GD和CC,遮挡光栅刺激所需的光能分别增加约6%和10%,使用两点技术测量的BLF光传播减少约26%。BLF使雪球和辐条分别减少了24%和19%。BLF显著改善了各种视觉指标的功能。
期刊介绍:
The principal aim of Current Eye Research is to provide rapid publication of full papers, short communications and mini-reviews, all high quality. Current Eye Research publishes articles encompassing all the areas of eye research. Subject areas include the following: clinical research, anatomy, physiology, biophysics, biochemistry, pharmacology, developmental biology, microbiology and immunology.