Eye tests for biological age may be inaccurate if performed without glasses.

“this test they often don't do without glasses and then it's is not accurate for biological aging assessment — you've got to follow the testing guideline this is for um it's one of the oldest tests ever made actually for biological age quantification and literally in 1912 in the paper it's like show me the age of your eyes and like well show me your show me your result in this test I can guess your age and it's really uncanny it's uh kind of scary because it's uh this measures uh lens stiffness index essentially and ancillary muscle uh aging as well but it's how close you can focus your irons”