Depth Perception and Grasp in Central Field Loss.
Depth Perception and Grasp in Central Field Loss.
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DOI：
10.1167/iovs.15-18336
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发表时间：
2016-03
影响因子：
4.4
通讯作者：
Fletcher DC
中科院分区：
文献类型：
--
作者：
Verghese P;Tyson TL;Ghahghaei S;Fletcher DC
我们着手确定患有中央视野丧失的个体是否从使用两只眼睛执行抓握任务中受益。具体来说，我们验证了这种优势与粗糙立体视觉相关的假设，以及视力、对比敏感度和双眼视野的双目综合指数。16名黄斑变性患者和9名年龄匹配的对照组将钉子放在钉板上，同时记录他们的眼睛和手的运动。重要的是，钉板被放置在接近眼睛高度，以尽量减少单眼线索对钉位置的贡献。所有的参与者都用双眼和单眼来完成这项任务。在实验之前，我们进行了显微镜观察，以确定每只眼睛的视野损失情况和偏心固定的位置（如果适用）。此外，我们还通过使用RanDot测试和自定义立体测试来测量单眼和双目的敏锐度和对比灵敏度，以及立体视觉。在患者组和对照组中，使用双眼观察的受试者比使用单眼观察的受试者出现更少的错误。在具有可测量立体视的参与者中，立体视敏度与钉钉放置时间的双眼优势显著相关（ρ = - 0.78; P = 0.003）。在没有可测量立体视觉的患者中，双眼优势与两眼间暗点重叠显著相关（ρ = - 0.81; P = 0.032）。抓握能力和立体视敏度之间的高相关性表明，粗糙的立体视可能有利于中央视野丧失患者的日常生活任务。
We set out to determine whether individuals with central field loss benefit from using two eyes to perform a grasping task. Specifically, we tested the hypothesis that this advantage is correlated with coarse stereopsis, in addition to binocular summation indices of visual acuity, contrast sensitivity, and binocular visual field. Sixteen participants with macular degeneration and nine age-matched controls placed pegs on a pegboard, while their eye and hand movements were recorded. Importantly, the pegboard was placed near eye height, to minimize the contribution of monocular cues to peg position. All participants performed this task binocularly and monocularly. Before the experiment, we performed microperimetry to determine the profile of field loss in each eye and the locations of eccentric fixation (if applicable). In addition, we measured both acuity and contrast sensitivity monocularly and binocularly, and stereopsis by using both a RanDot test and a custom stereo test. Peg-placement time was significantly shorter and participants made significantly fewer errors with binocular than with monocular viewing in both the patient and control groups. Among participants with measurable stereopsis, binocular advantage in peg-placement time was significantly correlated with stereoacuity (ρ = −0.78; P = 0.003). In patients without measurable stereopsis, the binocular advantage was related significantly to the overlap in the scotoma between the two eyes (ρ = −0.81; P = 0.032). The high correlation between grasp performance and stereoacuity indicates that coarse stereopsis may benefit tasks of daily living for individuals with central field loss.