Eye Know O.D. logo
Register
Email Address: *
First Name: *
Last Name: *
Title:
Profession:
Password: *
Confirm Password: *

By clicking “Register” you are agreeing to the Terms and Conditions and Privacy Policy.

afterimage test


A method for assessing retinal correspondence by projecting afterimages of two flashing lights, one vertical and one horizontal, onto each eye. In normal retinal correspondence (NRC), the afterimages form a cross. In anomalous retinal correspondence (ARC), the afterimages are offset, indicating a mismatch between the fovea of one eye and an extra-foveal point in the other eye.