Table 3.

Visual acuity and definitions of visual impairment.^26,40Reproduced with permission from Fiske et al., Special Care Dentistry: Quintessentials of Dental Practice, Quintessence Publishing, 2009⁴⁰

Visual acuity	Visual impairment
VA 6/12 to >6/18	Patient may not be able to drive; may have difficulty reading small print, even with glasses
VA 6/18 to >3/60	Patient is partially sighted and has a severe sight problem; can only read the top letter of the eye chart from ≤6 m
VA <3/60	Patient is legally blind; can only read the top letter of the eye chart from ≤3 m