I don't wear glasses or contact lenses if that is what you mean. Perhaps I eat carrots, and that is the answer. 
If that, grandfather's answer: @JetCash.grandfather, grandson there are some questions & exams that l want to give to grandfather...!
I want to test how great the eyes of someone who always eats carrots, against the eyes at the age of 78 years.
Come on grandfather, I tested grandfather's eyes, how sharp the eyes at the age of 78, grandfather, not, use lenses, naturally.
Grandfather see this picture;
There are 9 round columns, each of which has: (number), what number is in it...!
If this can be answered, I'm sure, the age of @Jet Cash is now;.........!