Without good vision, it's difficult to play any position well. If you can correct your vision with glasses, contracts or surgery, then any position may work. You maybe best to start with first base, where height is an advantage.
Ability run is mainly an advantage on the base paths and in the outfield, but vision is important and becoming a decent fielding outfielder takes some practice.
If vision will be an issue, then pitching may be your best option. A keen eye is less critical when pitching than hitting or fielding, as long as you can see well enought to read the catcher's signals.