Isochromatic chas are used for: March 2008
Ans. B: Testing colour vision Isochromatic chas/Japanese Ishihara chas is used for testing colour vision and it largely identifies red-green anomalies. The American Hardy-Rand-Ritler (H-R-R) test identifies blue-yellow anomalies.
Contrast sensitivity
Testing colour vision
Visual fields chaing
Visual acuity testing