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Reading prescription

2019-04-08 20:46:52
How to find the spherical equivalent( including cylinder) in terms of -D power if I have both spherical and cylindrical? If the prescription is as below: Left eye sph -4.5 Cyl -3.5 axis 10 Right eye sph -4 cyl -3 axis 180 What is the spherical equivalent? Should I add both spherical and cylindrical power together? What is the formula?
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Hello Spherical equivalent: spherical power+ cylindrical power/2 In above case: right eye: 4+3/2= 5.5

Answered2019-04-09 01:40:10

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