Faculty of Optics and Optometry, Complutense University, Madrid, Spain.
J Refract Surg. 2013 Sep;29(9):618-22. doi: 10.3928/1081597X-20130819-03.
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, Pérenchies, France) and to assess the repeatability of the method.
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.
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.
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.
使用 Vision Monitor（MonCv3；Metrovision，Pérenchies，法国）确定健康人各年龄段眼睛受强光刺激后视野内光环的大小，并评估该方法的可重复性。
对 147 名健康受试者（平均年龄：48.2 ± 16.2 岁）的右眼进行了测量，这些受试者被分为 6 个年龄组。使用 Vision Monitor，在 2.5 m 的距离处呈现低亮度视标。光环的视角用弧分（arc min）表示。通过计算 37 名 50 岁以上受试者的 Bland-Altman 可重复性系数，确定该方法的可重复性。
光环的平均半径为 111.6 ± 39.8 arc min。光环半径从 50 岁到 59 岁开始显著增加。光环半径与年龄（r = 0.65；P <.0001）之间的关系通过拟合幂函数来描述。光环大小与性别无关。该方法的可重复性系数为 ±44 arc min。
光环大小随年龄增长呈幂函数增加。提供的正常光环大小值有助于临床医生区分正常或异常眩光问题。光环大小测量的组间可重复性表明，该方法可用于评估由眩光引起的视力障碍。
