In case of staying up late, drink a cup of water after each hour or half hour. Protect your eyes from dust, smoke, strong sunlight and strong wind. Avoid staying longer in such conditions. In case you have to stay, blink often and massage the closed eyes gently with your palms. Try to maintain regular and clean bowel movements.
Constipation weakens the eye sight.
Regular eye exercise maintains perfect eye sight. Rub the palms of both hands for about 30 seconds, close the eyes and gently place the warm palms over the eyes. Eating cabbage and carrots is very beneficial for the eyes. These should be eaten raw. It is all right to drink cabbage and carrot juice mixed together or separately.