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Medical Forum / General / Vision / October 2006Can you average out a prescription?
By that I mean, if the prescription is -2 and -2.50 would you say it was an average -2.25? > By that I mean, if the prescription is -2 and -2.50 would you say it was an > average -2.25? Do you mean the left eye and the right eye? I guess you could, but other than OTC reading glasses, it doesn't make sense. Say your right foot needed a size 8 shoe and the left needed a 9. Your average would be 8.5, but what good is knowing that? If you put an 8.5 on your left foot you will have sore toes.  SignatureDan Abel dabel@sonic.net Petaluma, California, USA I've heard this rounded up to a kind of *mean* prescription that would make you the average of your two prescriptions although I don't know exactly how helpful that is to anyone! > By that I mean, if the prescription is -2 and -2.50 would you say it was > an > average -2.25? Depends on what you're trying to do. It's common to "average" that way, but only in certain circumstances. If the cornea measures -2.00 along one meridian and -2.50 90 degrees away, we'd use a -225 contact lens. If somebody wore -2.00 in one eye and -2.50 in the other and only used contacts rarely, it might make sense to buy only one box of -2.25. Some wouldn't like it full-time. If you've had two prescriptions very close together and they came out -2.00 in both eyes, then -2.50, I might choose one or the other, or the average, based on your age and your intended use for the glasses. Give us some more detail. -MT > > By that I mean, if the prescription is -2 and -2.50 would you say it was > > an > > average -2.25? > > Depends on what you're trying to do. > If somebody wore -2.00 in one eye and -2.50 in the other and only used > contacts rarely, it might make sense to buy only one box of -2.25. Some > wouldn't like it full-time. The other nice thing with using the same strength contacts in both eyes is that you don't have to worry about mixing them up. SignatureDan Abel dabel@sonic.net Petaluma, California, USA > By that I mean, if the prescription is -2 and -2.50 would you say it was an > average -2.25? > > -- > Message posted via http://www.medkb.com Why would you? Youll develop eyestrain! |
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