Hathibelagal Amithavikram R, Leat Susan J, Irving Elizabeth L, Nandakumar Krithika, Eizenman Moshe
*BOptom, MSc †PhD, FCOptom, FAAO ‡OD, PhD §BOptom, PhD ∥PhD School of Optometry and Vision Science, University of Waterloo, Ontario, Canada (ARH, SJL, ELI, KN); and Institute of Biomaterials and Biomedical Engineering, University of Toronto, Ontario, Canada (ME).
Optom Vis Sci. 2015 Jul;92(7):823-33. doi: 10.1097/OPX.0000000000000613.
To validate a method of measuring grating acuity with remote gaze tracking (GT) against a current clinical test of visual acuity (VA), the Teller Acuity Cards (TACs), as part of the development of an automated VA test for infants.
Visual acuity for computer-generated horizontal square-wave gratings was determined from relative fixation time on a grating area compared with the background. In experiment 1, binocular VA was based on eye movements with a GT in 15 uncorrected myopic adults and compared with VA measured with subjective responses with the same stimuli and with the TACs. In experiment 2, binocular VA was determined in 19 typically developing infants aged 3 to 11 months on two visits with both the GT and TACs.
In adults, the mean difference between VA measured by the GT and TACs was 0.01 log cycles per degree (cpd) and the 95% limits of agreement were 0.11. One hundred percent of GT VA results were within 0.5 octave of the TACs' VAs. The mean difference between the GT and TACs for infants was 0.17 log cpd on both the first and second visit (95% limits of agreement, 0.42 and 0.47, respectively). The mean difference between test and retest for infant GT VA was 0.06 log cpd, and limits of agreement for repeatability were 0.48 log cpd. In infants, both the TACs and the GT had a reliability of 89% within less than or equal to 1 octave between visits. Gaze tracking VA improved with age and is in agreement with published norms.
The agreement between the TACs and GT in adults and infants validates the method of measuring grating acuity with the remote GT. These results demonstrate its potential for an automated test of infant VA.
作为婴儿自动视力测试开发的一部分，将一种利用远程注视追踪（GT）测量光栅视力的方法与当前的视力（VA）临床测试——泰勒视力卡片（TACs）进行验证。
通过与背景相比在光栅区域上的相对注视时间来确定计算机生成的水平方波光栅的视力。在实验1中，15名未矫正近视的成年人基于GT的眼动确定双眼视力，并与使用相同刺激的主观反应和TACs测量的视力进行比较。在实验2中，对19名年龄在3至11个月的正常发育婴儿进行两次检查，同时使用GT和TACs确定双眼视力。
在成年人中，GT测量的视力与TACs测量的视力之间的平均差异为每度0.01对数周期（cpd），95%的一致性界限为0.11。100%的GT视力结果在TACs视力的0.5倍频程范围内。婴儿第一次和第二次检查时，GT与TACs之间的平均差异均为0.17 log cpd（95%一致性界限分别为0.42和0.47）。婴儿GT视力测试与复测之间的平均差异为0.06 log cpd，重复性的一致性界限为0.48 log cpd。在婴儿中，TACs和GT在两次检查之间小于或等于1倍频程内可靠性均为89%。注视追踪视力随年龄增长而提高，且与已发表的标准一致。
TACs与GT在成年人和婴儿中的一致性验证了利用远程GT测量光栅视力的方法。这些结果证明了其在婴儿VA自动测试中的潜力。
