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2:55 Plus or minus 7. What about SPH -5.50 CYL -1.50? If you add them up, you get -7.00. Would vertex distance matter in that particular case?
8:47 "This actually causes the prescription to get weaker, which means the patient would see a BIGGER image . . " -- I think you mispoke. With minus lenses, as you move the lens further away from the eye, the patient perceives a SMALLER image.
2:55 Plus or minus 7. What about SPH -5.50 CYL -1.50? If you add them up, you get -7.00. Would vertex distance matter in that particular case?
8:47 "This actually causes the prescription to get weaker, which means the patient would see a BIGGER image . . " -- I think you mispoke. With minus lenses, as you move the lens further away from the eye, the patient perceives a SMALLER image.