视力(visual acuity,VA)是指视觉的灵敏度及清晰度,主要取决于眼睛视网膜中心对视觉图像的敏锐程度和大脑中视皮层对图像的解析能力[1]低视力(low visual acuity[2][3]),按世界卫生组织的标准,是指患者较好眼的最佳矫正视力 <0.3 但 ≥0.05 时的现象[4][5]

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