18 and my eyesight is 20/20 on one eye, and on other it's bad, not really a problem for every day work.
Memory is okay (i hope it is), i can remember 98% things about different fields of engineering but when it comes to fkn literature, history and geography (only statistics) i can't remember two things...
However my calculations are very limited to what i can to with my brain, i use calculator for almost everything, i wish i could break that habit... but analysing schematics and figuring out how stuff works isn't a problem at all.