Figure 1 Distribution of visual acuity (VA) and visual field (VF) impairment. Categories of VA impairment in ocular toxoplasmosis: normal ⩾20/25; mildly impaired 20/60–20/25; moderately impaired (low vision according to WHO criteria) 20/400–20/60; severely impaired (blind according to WHO criteria) <20/400. Categories of VF damage in ocular toxoplasmosis: normal, with a mean defect that falls within the normal range (−2 to +2 dB). Damage to the VF was scored as: mild (mean defect ⩽+4 dB), moderate (mean defect +4 to +12 dB) or severe (mean defect >+12 dB), on Octopus standard automated perimetry.