視力

視力（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Cline D; Hofstetter HW; Griffin JR. Dictionary of Visual Science. 4th ed. Butterworth-Heinemann, Boston 1997. ISBN 0-7506-9895-0。低视力（low visual acuityMoussa G, Bassilious K, Mathews N. A novel excel sheet conversion tool from Snellen fraction to LogMAR including 'counting fingers', 'hand movement', 'light perception' and 'no light perception' and focused review of literature of low visual acuity reference values. Acta Ophthalmol. 2021;99(6):e963-e965. doi:10.1111/aos.14659Becker R, Teichler G, Gräf M. Reproducibility of visual acuity assessment in normal and low visual acuity. Strabismus. 2007;15(1):3-6. doi:10.1080/09273970601172435），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Thylefors B, Négrel AD, Pararajasegaram R, Dadzie KY. Global data on blindness. Bull World Health Organ. 1995;73(1):115-121.。

 参见 
 角分辨率
 （又稱為斯耐倫視力表、史奈侖視力檢查表、施氏視力表、驗眼圖、標準視力測驗圖形）
 视觉
折光度
 視力測試

 近视

 参考文献 

 扩展阅读 
 Duane's Clinical Ophthalmology, V.1 C.5, V.1 C.33, V.2 C.2, V.2 C.4, V.5 C.49, V.5 C.51, V.8 C.17, Lippincott Williams & Wilkins, 2004.
  Головин С.С. Сивцев Д.А. Таблица для исследования остроты зрения. 3 изд. М., 1927
 GB 11533—1989, 中国大陆的视力表标准

 外部链接 
 How Visual Acuity is Measured 
 Visual Acuity of the Human Eye
 Golovin-Sivtsev Table for testing visual acuity  - used in the USSR and post-Soviet states in different formats (as pdf or cdr files)
 Visual Acuity Chapter from the Webvision reference, University of Utah

Category:视觉

nl:Visus