Calculation of Diopter Question

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Calculation of Diopter Question

Postby blan11 » Wed Jan 03, 2007 4:00 am

I have a question about calculation of diopters. Is it simply sphere + cylinder? An Optometrist once told me you halve something and then add, and another say you just add the two.

My prescription is (I know, I know – my myopia and astigmatism are significant. This is why I have been researching PRK so long):
OD -6.75 -3.00 25
OS -7.75 -3.25 161
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Postby LasikExpert » Wed Jan 03, 2007 5:43 am

What you appear to seek is the equivalent sphere. See how to read eyeglass prescription for details.

Your myopia is moderately high and your astigmatism is very high.
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Postby GodsClay » Mon Jan 22, 2007 5:28 pm

What range is considered high astigmatism..... or...... is it a combo of both eyes?

I guess I'm asking how can you tell if your astigmatism is high, moderate or low?

Thank you :)
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Postby LasikExpert » Mon Jan 22, 2007 6:28 pm

Astigmatism over about 2.00 diopters would be rather high and would very likely affect vision quality. Astigmatism that is more than half the myopia can be more challenging to correct.
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