What is the correlation (if any) between the visual acuity measured on the Snellen chart and diopter correction required? For example, I assume 20/20 correlates to plano. How many diopters are required to completely correct the refractive error for 20/30, 20/40, 20/50, and on down the line...(-1, -2, -3 etc...)
And a second related question... If the dominant eye is corrected to 20/20 and the non-dominant eye is corrected to a mini-monovision ( and, I know contact lens measurements are completely different), what Snellen value is generally aimed at to give a minimal amount of near vision correction for a completely presbyopic patient (over age 52).