低视力的概念出现于20世纪60年代,表示介于功能视力和盲之间的一种视觉功能状态。所谓功能视力指正常视力或能进行一般正常活动的视力,又称有用视力。通常认为视力达到0.3以上者即能够保证进行一般的正常活动。盲指两眼中最好视力0.05。而低视力指患者经过治疗和标准的屈光矫 The concept of low vision appeared in the 1960s, indicating a visual state of function between functional vision and blindness. The so-called functional vision refers to the normal visual acuity or can carry out normal activities of normal vision, also known as useful vision. Generally considered that the visual acuity of 0.3 or more can guarantee the normal normal activities. Blind refers to the best visual acuity in both eyes. Low vision refers to patients treated and standard refractive correction