0

Eye read that in eye tests red and green colors are used. For example:

enter image description here

But in Snellen/Eye chart, these are not background colors. These are lines only. What is the purpose of it?

enter image description here

1

Its for a 'Red-Green duochrome test'.

A primary task of the eye care professional is determining the refraction, or optical correction, of a patient. The duochrome red-green test is a standard tool for verification of the final refraction. Traditionally, it is recommended for use both prior to and subsequent to determining the cylindrical or astigmatic component of the refraction.

Red-Green Duochrome testing

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.