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how to calculate your eye prescription?

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How can I calculate my prescription for computer glasses?
The only formulas I can find online are for longsighted people. My near vision is perfect. For example, my prescription is:

Right  SPH -1.50, CYL -1.00, AXIS 85
Left SPH -1.25, CYL -1.00, AXIS 90

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asked Feb 12 in Health by smyadmin

5 Answers

0 votes
The nice thing about the optics of the eye is that the formulas are the same for everyone:

1/D = f

Where D is your lens power in diopters
And f is the focal distance in meters

So if you want your computer screen 80 cm from your face that is 0.8 m

1/D = 0.8
1/0.8 = D
D = 1.25 = +1.25

Now just add this +1.25 to the spherical portion of your prescription (for both eyes) and voilĂ  you have computer glasses.

Note: this is just an example, different people like different distances and will need different prescriptions. Also this assumes that your distance prescription has not changed. Also it is important to get regular eye check ups from your optometrist or ophthalmologist to check for other eye diseases that may or may not have any symptoms. This answer is not a substitute for professional medical advice, please consult your medical professional for your own healthcare needs.
answered Feb 12 by Mitul Mehta
0 votes
You simply can't.  To do it properly there is too many factors involved.  Age, amount of accomodation left, symptoms, screen position, office layout etc. Power will have to be reduced for closework  but amount of reduction needed must be measured first. Besides there a lot of different type of lenses available for computer use and you well advised to get advice on which one would fulfill your needs first. Cheapest or simplest solution not always the wisest.
answered Feb 12 by Sergey Bobyk

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