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;
note:
the other (young), no, may answer, only for grandfather: @JetCash.
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;.........!
ha.ha.ha. a little humor.
What if i'm colorblind 
Not visible at all.This method is used by ophthalmologists for patients, age 78.
You know he can do some tricks over internet to read the numbers.
@OP I am around 5 years old here.