How long does it take for a senior vision to change?

Impossible. Impossible to answer. Some seniors have great vision, some are not so great. It is very individual.

Related Questions

How long does it take for a seniors vision to change from aging?

Depends. Old age is not incompatible with good vision, but more diseases become more common as we age like presbyopia, cataracts, glaucoma, macular degeneration, etc. Regular eye exams are key to picking up eye diseases before they cause permanent damage. Read more...