2 years ago Julian's eye Dr. checked his eyes using 15 different prisms...Dr. Y found that Julian could read better and focus better if he was given glasses tinited blue...he showed Julian sentences on different colored paper and found that the blue was the best for Julian...He examined Dante' and found him to need a yellow tint to keep the eyes from getting irriatated...This Dr. Y works with the special needs children and adults...he is great...we even went thorugh vision therapy...Julian's problem was corrected, but Dante' still needs more work...but then again Dante' needs vitamin A where Julian does not...according to Dr.Y the boys inherited this problem from me...you can see it in the eye picture that was taken...At home if I am reading for a long time...I will place over pages a pink plastic see through divider and I can see so clear...it is fasinating.Try it on your self...the palstic sheets are $3.00 at walmart...