O.D. = Right eye
-0.75 = three quarters of a diopter sphere for myopia
-0.50 = half a diopter of cylinder for astigmatism
170 = one hundred seventy degrees is the orientation of the cylinder correction
O.S. = Left eye
-0.50 = half a diopter diopter sphere for myopia
-0.75 =three quarters of cylinder for astigmatism
180 = one hundred seventy degrees is the orientation of the cylinder correction
Most people with this type prescription only wear the glasses to see extra well at distance since it is not a strong prescription.
