That will make my eye super tired. Just looking at a word doesn't need much effort but focus on very precise location in between two character is very different

That will make my eye super tired. Just looking at a word doesn't need much effort but focus on very precise location in between two character is very different. Try it with for example iiiiiiiiiiiiiiiiiiii or |||||||||||. Actually, the presence of a cursor makes it much easier. Place a cursor and looking at it vs Place the cursor by looking at a place are very different.