Relationship between halo size and forward light scatter
Relationship between halo size and forward light scatter
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DOI：
10.1136/bjophthalmol-2014-304872
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发表时间：
2014-10-01
影响因子：
4.1
通讯作者：
Barrio, Ana
中科院分区：
文献类型：
--
作者：
Puell, Maria C.;Perez-Carrasco, Maria J.;Barrio, Ana
目的探讨眩光光源引起的晕圈大小与前向散射或视力的关系。方法对51例平均年龄29.3+/-7.5岁的健康人右眼进行测量。用视觉监视器测量光晕半径，在2.5m处显示低亮度(1cd/m(2))视标，计算出光晕半径与视角的差值，单位为弧分(弧分)。使用补偿比较技术测量前向散射或杂散光。在明视(85cd/m(2))和中视(0.15cd/m(2))亮度条件下，用高对比度(HC)(96%)和低对比度(LC)(10%)的Bailey-Lovie Log MAR字母表测量最佳矫正距离VA。结果平均晕环半径为202+/-43弧分(3.4+/-0.7度)，平均视网膜散光为0.95+/-0.12log单位。平均光距离HC-VA为-0.02+/-0.06，LC-VA为0.12+/-0.09logMAR。平均中间视距HC-VA为0.35+/-0.11，LC-VA为0.74+/-0.11 logMAR。正向逐步回归分析显示晕轮半径与散光(r=0.45)和中视LC-VA(r=0.48)显著相关，而与明视HC-VA和/或LC-VA和中视HC-VA无关。结论正常眼眩光光晕越大，前向散射(散光)越大，中视LC-VA越差。晕的大小似乎与明视的HC-VA或LC-VA和中间的HC-VA无关。
Purpose To determine the relationship between the size of a halo induced by a glare source and forward scatter or visual acuity (VA) in healthy eyes.Method Measurements were made in the right eyes of 51 healthy individuals of mean age 29.3 +/- 7.5 years. Halo radius was measured using the Vision Monitor and low luminance (1 cd/m(2)) optotypes presented at a distance of 2.5 m. The visual angle subtended by the radius of the halo was calculated in minutes of arc (arc min). Forward scatter or, straylight, was measured using the compensation comparison technique. Best-corrected distance VA was measured using high contrast (HC) (96%) and low contrast (LC) (10%) Bailey-Lovie logMAR letter charts under photopic (85 cd/m(2)) and mesopic (0.15 cd/m(2)) luminance conditions.Results Mean halo radius was 202 +/- 43 arc min (3.4 +/- 0.7 degrees) and mean retinal straylight was 0.95 +/- 0.12 log units. Mean photopic distance HC-VA and LC-VA were -0.02 +/- 0.06 and 0.12 +/- 0.09 logMAR, respectively. Mean mesopic distance HC-VA and LC-VA were 0.35 +/- 0.11 and 0.74 +/- 0.11 logMAR, respectively. Forward stepwise regression analysis revealed that halo radius was significantly correlated with straylight (r=0.45) and mesopic LC-VA (r=0.48), but not with photopic HC-VA and/or LC-VA and mesopic HC-VA.Conclusions In healthy eyes, the larger the halo size induced by a given glare source, the greater the forward-scatter (straylight) and worse the mesopic LC-VA. Halo size seems to be independent of photopic HC-VA or LC-VA and mesopic HC-VA.