'astigmometry' originates from New Latin/Modern scientific coinage, specifically built from the Greek elements 'a-' (not) + 'stigma' (point) and the combining form 'metron' meaning 'measure'.

'astigmometry' changed from the New Latin/Greek-derived root 'astigmat-' (seen in 'astigmatism') and the suffix '-metry' (from Greek 'metron'), and was coined in modern scientific English as 'astigmometry'.

Initially the Greek-derived element 'astigma' conveyed the idea of 'without a point' (an optical defect); over time the compound came to be used specifically for 'measurement related to that defect', giving the specialized modern meaning 'measurement of astigmatism'.