system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Isochromatic chas are used for: March 2008
assistant
The correct answer is  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.