half-blindness; partial blindness
Medical term for partial loss of vision, not complete blindness. Often used in clinical or ophthalmological contexts.
Patients with half-blindness have a partial loss of their visual field.
Compound of 半 (half) + 盲 (blind) + 症 (condition/disease). The exact historical derivation is uncertain, but the kanji straightforwardly indicate a condition of partial blindness.