Utilize our 20/20 Vision Calculator for 2020 to quickly interpret your eye test results. Input your testing distance and the smallest line you can read to understand your visual acuity relative to the ideal 20/20 standard. Determine if your vision is sharper, normal, or requires attention based on Snellen chart measurements, perfect for reviewing your visual acuity.
Formula:
The 20/20 vision calculation is based on the Snellen fraction, a fundamental measure of visual acuity:
Vision = Test Distance (X) / Smallest Line Read (Y)
Where:
- Test Distance (X): The fixed distance in feet at which you take the eye test (typically 20 feet in the US).
- Smallest Line Read (Y): The denominator of the Snellen fraction, representing the distance in feet at which a person with normal vision can read the same line you read. This value is printed next to each line on a standard Snellen eye chart (e.g., 20, 30, 40, 50, 70, 100, 200).
A result of 20/20 indicates normal visual acuity.