Bertera J H
Eye Research Institute of Retina Foundation, Boston, Massachusetts 02114.
Invest Ophthalmol Vis Sci. 1988 Mar;29(3):470-5.
A simulated scotoma was stabilized on the fovea of 23 normal human subjects while they searched for acuity targets in arrays of non-targets. Search time doubled with a 20 min arc scotoma, and eye fixation duration increased by about 15% when compared to no-scotoma control conditions. Search difficulty was graded by adjusting acuity target size, search element density and contrast. Search time and eye fixation duration generally increased with display difficulty in no-scotoma conditions. Results are discussed in terms of sensory loss and motor disruption due to the simulated scotoma. The simulated scotoma method may be useful in studying adaptation to visual field loss in patient populations where the size, position and severity of the scotoma can be controlled.
在23名正常人类受试者的中央凹上稳定呈现一个模拟暗点，同时他们在非目标阵列中搜索视力目标。与无暗点对照条件相比，20分视角的暗点使搜索时间加倍，并且眼注视持续时间增加了约15%。通过调整视力目标大小、搜索元素密度和对比度来分级搜索难度。在无暗点条件下，搜索时间和眼注视持续时间通常随着显示难度的增加而增加。从模拟暗点导致的感觉丧失和运动干扰方面对结果进行了讨论。模拟暗点方法可能有助于研究在暗点大小、位置和严重程度可控制的患者群体中对视野丧失的适应情况。
