Blur perception throughout the visual field in myopia and emmetropia.
Blur perception throughout the visual field in myopia and emmetropia.
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DOI：
10.1167/17.5.3
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发表时间：
2017-05-01
影响因子：
1.8
通讯作者：
Vera-Diaz FA
中科院分区：
文献类型：
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作者：
Maiello G;Walker L;Bex PJ;Vera-Diaz FA
我们评估了正视眼和近视眼观察者在单眼或双眼观察条件下检测和区分视网膜模糊的能力。我们招募了39名年轻（23-30岁）健康成人（n = 19名近视患者），每只眼睛的最佳矫正视力为0.0 LogMAR（20/20）或更好，无双眼或双眼功能障碍。单眼和双眼的模糊辨别阈值测量作为一个功能的基座模糊使用自然的刺激与自适应4AFC程序。刺激在40 cm处的46°直径窗口中呈现。高斯模糊矢量被限制在0°、4°、8°或12°偏心率的环中，模糊增量仅应用于图像的一个象限。自适应过程有效地估计了一个具有两个参数的勺形模糊判别阈值函数：固有模糊和模糊灵敏度。视网膜偏心度超过4°时，固有模糊量增加（p < 0.001），双眼情况下的固有模糊量低于单眼情况（p < 0.001），但屈光组之间的固有模糊量相似（p = 0.47）。模糊敏感度随着视网膜偏心率的增加而降低（p < 0.001），并且在双眼观看时最高，但仅在中央视觉时最高（p < 0.05）。近视者单眼模糊敏感度比正视者差（p < 0.05），但双眼模糊敏感度与正视者无差异（p = 0.66）。正如预期的那样，模糊感知在视觉周边和双眼总和是最明显的中央视觉。此外，近视患者表现出在双眼条件下改善的模糊灵敏度的单眼损害。近视发展的影响进行了讨论。
We evaluated the ability of emmetropic and myopic observers to detect and discriminate blur across the retina under monocular or binocular viewing conditions. We recruited 39 young (23–30 years) healthy adults (n = 19 myopes) with best-corrected visual acuity 0.0 LogMAR (20/20) or better in each eye and no binocular or accommodative dysfunction. Monocular and binocular blur discrimination thresholds were measured as a function of pedestal blur using naturalistic stimuli with an adaptive 4AFC procedure. Stimuli were presented in a 46° diameter window at 40 cm. Gaussian blur pedestals were confined to an annulus at either 0°, 4°, 8°, or 12° eccentricity, with a blur increment applied to only one quadrant of the image. The adaptive procedure efficiently estimated a dipper shaped blur discrimination threshold function with two parameters: intrinsic blur and blur sensitivity. The amount of intrinsic blur increased for retinal eccentricities beyond 4° (p < 0.001) and was lower in binocular than monocular conditions (p < 0.001), but was similar across refractive groups (p = 0.47). Blur sensitivity decreased with retinal eccentricity (p < 0.001) and was highest for binocular viewing, but only for central vision (p < 0.05). Myopes showed worse blur sensitivity than emmetropes monocularly (p < 0.05) but not binocularly (p = 0.66). As expected, blur perception worsens in the visual periphery and binocular summation is most evident in central vision. Furthermore, myopes exhibit a monocular impairment in blur sensitivity that improves under binocular conditions. Implications for the development of myopia are discussed.