Eye Test

Doing an Eye test is simple ...
I tried below and see how this works for you.
Stand at about 1 metre away from your screen showing this page, and tell yourself if you can see all these characters correctly?

E e A a M m B b z Z
E e A a M m B b z Z
1 2 3 4 5 6 7 8 9 0

1 2 3 4 5 6 7 8 9 0

If you cannot see the smallest one, you could be tired.
But if you cannot see the character second pair small characters, you probably need to see the optician for a check.

Keep you eye healthy !!!