How goes your eye sight get worst? I can understand if you don't ever wear your glasses and/or contact lenses because you would be straining your eyes. Or even squinting. But if you wear contact lenses every day, and glasses every evening, how can it get worse? I went from a -2.50 in both eyes perviously, to a -3.00 in the right and -3.25 in the left from my recent eye exam. Anyone know? I don't want to be blind by the time im thirty.