What is Duochrome Test? Why red and green test Important?

It is based on principle of chromatic aberration.The Patient is asked to read the red and green letters. The Duochrome Or Bichromatic Test Is Commonly Used As A Check On The Best Vision Sphere During Monocular Refraction.

  • Therefore, to an emmetropic patient letters of both colours look equally sharp.
  • If The Letters Of The Green Side Are Clearer +0.25 D Sphere Is Added.
  • If The Letters On The Red Side Are Clearer -0.25 D Sphere Is Added.

The duochrome test is not used with patients whose visual acuityis worse than 20/30 (6/9), because the 0.50 D difference between the two sides is too small to distinguish.

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