Crossword clue: (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point

The most common answer is astigmatism (11 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

astigmatism 11 letters wn-def

(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point

astigmia 8 letters wn-def

(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point