Color Vision Loss - peripheral v. central
Channel: Merrill Bowan
Date: 23/10/2011

Microprism application - John is featured in two other videos where his color vision is tested (12/11/10, 12/21/10). He has now been prescribed additional Base Down microprism as of this summer, with notable behavioral changes. His balance and ambulation skills have greatly improved, according to his family. He now has a therapeutic tint ordered by a low vision specialist in collaboration with our office. 

His perception of a red test card case (Lang Stereotest) is black with his R eye, strawberry with his L. His central perception of red letters (the very same ones used in the 3/28/11 video of Jon) vision is now black with his L eye, BLACKER with his R. Central v.peripheral color perception thus seems to use two different pathways, but the variability between cases is significant.

We will repeat the Ishihara at a future visit.