What Causes Redness In The Eyes?

My eyes have always been very white with the center bright blue but 3 years ago for a couple months the whites of my eyes turned really red. I started using eye drops and 3 years later their not as red but they are always glossy and not that pure white anymore and they get red more often. I don t smoke, do drugs or use the computer that often. I get plenty of sleep, exercise and eat healthy. I saw a doctor once about it and he said that I burned the top layer of my eyes from the sun and wind and that they will never be white again. Is that all true? What do you recommend. I want my pretty eyes back! I m only 27.