LASIK: The Day After
November 1st, 2009I had my next-day check-up and wow, I see better now than I did with my glasses. 20/15 in fact, which is better than normal 20-20 vision.
Sweet…
This prompted me to dig into how vision is tested since I always assumed 20/20 was perfect and anything else (20/15 for example) would be bad. I also assumed that was left-eye (20)/right-eye(20) which also turned out to be wrong.
20/20 means that you see as well from 20 feet as what doctors consider “a normal person” sees from 20 feet.
20/15 means I see as well from 20 feet as a “normal person” sees from 15.
While 20/20 is average there is variation, and some rare people naturally have eyes as good as 20/8.
They estimate the vision of eagles at 20/2.