A bit of a tengent, but... For those worrying about their eyesight when getting older... If you are into FLOSS, one last defense against your eyes failing when you get older is actually to contribute to accessibility before you (hopefully never) end up needing it. Disclaimer: I am blind myself.
I am not blind nor deaf etc., but I am frankly fed up with it. In my case, should I call myself "a person with programming, Czechness and fortysomething years"?
Nope, I am a middle-aged Czech programmer. Yes, that does not reflect my entire personality and humanity. So what. Better than this sort of language abuse.