Eye Prescription to 20/20 Scale
Convert your eye prescription (diopter sphere power) to the approximate Snellen 20/xx equivalent. See what your uncorrected vision would be on the familiar 20/20 scale.
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How to Use
- Enter your sphere (SPH) power for each eye.
- View the approximate Snellen 20/xx equivalent.
- See the vision category (normal, moderate, severe).
Frequently Asked Questions
How accurate is the diopter to 20/20 conversion?
This is an approximate conversion. Actual visual acuity depends on many factors including cylinder power, pupil size, corneal health, and age. Always consult an eye care professional.
What does 20/20 vision mean?
20/20 means you can see at 20 feet what a person with normal vision sees at 20 feet. 20/40 means you need to be at 20 feet to see what a normal person sees at 40 feet.
Does this work for both nearsighted and farsighted?
Yes. Both negative (nearsighted) and positive (farsighted) sphere values can be converted to the Snellen scale.
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