arcus senilis
(ophthalmology) A faint whitish ring around the iris in elderly people; discoloration of the iris with age.
Approximately monoenergetic
Describing a situation in which there are only two choices. / Describing a situation in which there is a choice between two different plans of action, but both together are not possible
Not esoteric.
定期的な眼科検査で眼科医は虹彩を取り巻く老人環（高齢者に見られる淡い白色の輪）を確認し、変化がないか経過観察を勧めた。
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