light reflex light reaction • light second · · · Info · Definitions · Synonyms · Characters · · light reflex · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller. Synonyms: light reflex, pupillary reflex, miosis, myosis. · · Noun Definition 1 Synonyms · · · pupillary reflex · · Synonym 1 miosis · · Synonym 2 myosis · · Synonym 3 Characters · · space U+0020 e latin small letter e U+0065 f latin small letter f U+0066 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C r latin small letter r U+0072 t latin small letter t U+0074 x latin small letter x U+0078