pupil dilation; mydriasis
Medical term for abnormal or induced widening of the pupil. Synonym: 散瞳.
See also: 散瞳
Pupil dilation occurs in dark places or due to certain medications.
The doctor checked for the presence of mydriasis.
Synonym also meaning pupil dilation; 散瞳 is slightly more common in clinical contexts, while 瞳孔散大 is more descriptive.
Antonym meaning pupil constriction (miosis).
Compound of 瞳孔 (どうこう, 'pupil') and 散大 (さんだい, 'dilation, enlargement'). The exact historical derivation is uncertain, but the kanji directly reflect the medical meaning.