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.

Dunno about eyes, but feet sure have untapped potential :p https://github.com/alevchuk/vim-clutch