I went to an optometrist and got a prescription. I actually went to two different optometrists and one of them misdiagnosed me. My prescription is extremely minimal, +1.25 on one eye and -1.25 on the other or something like that but it makes all the difference. If your eyes are extremely strained you may need to ask for the extremely strong eye relaxant drops when you visit your optometrist.. and warn him or her that you may have minus eyes. Apparently it's hard to properly diagnose minus eyes without doubling up on the eye drops.