Normal Values for the Size of a Halo Produced by a Glare Source
Normal Values for the Size of a Halo Produced by a Glare Source
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DOI：
10.3928/1081597x-20130819-03
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发表时间：
2013-09-01
影响因子：
2.4
通讯作者：
Palomo-Alvarez, Catalina
中科院分区：
文献类型：
--
作者：
Puell, Maria C.;Perez-Carrasco, Maria J.;Palomo-Alvarez, Catalina
目的：利用Vision Monitor （MonCv3; Metrovision, Perenchies, France）测定所有年龄段健康眼睛在强光下产生的视场晕的大小，并评估该方法的可重复性。方法：对147名健康受试者（平均年龄：48.2±16.2岁）进行右眼测量，并将其分为6个年龄组。使用视觉监视器，在2.5 m的距离上显示低亮度的光型。光晕半径所对应的视角以分弧（弧分）为单位计算。通过计算可重复性的Bland-Altman系数，在37名50岁以上的受试者中确定了该方法的可重复性。结果：光晕的平均半径为111.6±39.8弧min，光晕半径从50 ~ 59岁开始明显增大。光晕半径与年龄之间的关系（r = 0.65; P < 0.0001）通过拟合幂函数来描述。光晕大小与性别无关。该方法的重复性系数为+/- 44弧min。结论：光晕大小随年龄增大，遵循幂次模型。提供的正常光晕大小值可以帮助临床医生区分正常或异常眩光问题。光晕大小测量的间歇可重复性表明，该方法可用于评估眩光引起的视力损害。
PURPOSE: To determine the size of a halo in the visual field induced by bright light in healthy eyes of all ages using the Vision Monitor (MonCv3; Metrovision, Perenchies, France) and to assess the repeatability of the method.METHODS: Measurements were made in the right eyes of 147 healthy subjects (mean age: 48.2 +/- 16.2 years) who were classified into six age groups. Using the Vision Monitor, optotypes of low luminance were 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). The repeatability of the method was determined in a subset of 37 subjects older than 50 years by calculating the Bland-Altman coefficient of repeatability.RESULTS: The mean radius of the halo was 111.6 +/- 39.8 arc min. Halo radius started to increase significantly from the age of 50 to 59 years. The relationship between halo radius and age (r = 0.65; P < .0001) was described by fitting a power function to the data. Halo size was independent of gender. The coefficient of repeatability of the method was +/- 44 arc min.CONCLUSIONS: Halo size increases with age following a power model. The normal halo size values provided could help clinicians distinguish between normal or abnormal glare problems. The intersession repeatability observed for halo size measurement indicates this method could be useful for assessing visual impairment caused by glare.