A good start would be to eat more carrots, and also supplementing with beta carotene. Beta carotene is converted into vitamin A in the liver, then performs many tasks in the body-one of which is retina health (skin too).. If supplementing use beta carotene as opposed to supplementing vitamin A. Too much A can be toxic, however the body won't convet too much BC into vitamin A.
Hope this helps
PS, don't cook the carrots, I would expect in raw form more nutrients are more bioavailable.