'astigmatism-correcting' originates from Greek and Latin, specifically the New Latin/Greek-based word 'astigmatismus' (from Greek elements 'a-' + 'stigma') and the Latin verb 'corrigere', where 'a-' meant 'not/without', 'stigma' meant 'point' or 'mark', and 'corrigere' meant 'to make right or correct'.

'astigmatism' changed from New Latin 'astigmatismus' (itself based on Greek roots) and eventually became the modern English 'astigmatism'; 'correcting' derives from Old French/Latin via Latin 'corrigere', which evolved into English 'correct' and the present participle 'correcting'.

Initially, the root related to the idea of 'without a point/mark' (optical notion of failing to form a point image), but over time it evolved into the modern medical/optical meaning of 'an optical defect causing blurred or distorted vision', and 'correcting' retained the sense 'making right' or 'compensating for' that defect.