Optometrist supports Hamilton's theory

Dr. Richard L. Ison, O.D., an optometrist since 1990 who is practicing in Murphy, Texas, northeast of Dallas, said Rangers' outfielder Josh Hamilton's thoughts that having blue eyes makes it tougher on him to see during the day than those with darker eyes is true.

"Because of the lack of pigment in lighter color eyes, like blue or green eyes as opposed to brown, you get a lot more unwanted light and that can create glare problems," Dr. Ison said.

Dr. Ison said the phenomenon is called intraocular light scatter, meaning the light scatters as it enters, producing a focal point that isn't as good.

His solution for Hamilton: Find a pair of sunglasses that he's completely comfortable wearing while batting.

Dr. Ison noticed that in one of the Rangers' recent day games in Atlanta, Hamilton was adjusting the sunglasses he was wearing twice during one at-bat and then with two strikes, took them off completely.

"He has to find a pair that he likes and that will be the right tint for him," Dr. Ison said. "He just has to try some different kinds and figure out the right light transmission factor for him."

Hamilton told ESPN 103.3 FM's Bryan Dolgin that he's found another pair of sunglasses that he used while he was in the field last season and will try those this weekend when the club has two day games against the New York Mets.