A corneal transplant can cure some forms of blindness and visual impairment. The United States bans men from donating if they have had gay sex in the past five years; Canada has a 12-month restriction.
from WebMD Health https://www.webmd.com/eye-health/news/20200929/rules-on-cornea-donations-from-gay-men-prevent-sight-restoring-surgery-study?src=RSS_PUBLIC
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