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The duochrome test, also known as the red-green test, is a test commonly used to refine the final sphere in refraction, which makes use of the longitudinal chromatic aberration of the eye. The test, based on color distortion, occurs because different wavelengths of light are curved at different levels.

Duochrome Test

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Duochrome test. Non-static.

Do you still remember? You were once one of them. That war in 1999 took away your comrades, and your eyes.

All alone, wandering on this endless path.

How lucky you are, still blessed to enjoy the scenery of the Horizon.

How unlucky you are, blinded to the outside world.

Your right ear hears cheers and laughter, coming from the good old days.

Your left ear hears chants and whispers, coming from the final prayers.

The sky is still azure, the wheat still oily green.

The Road still stretches, the Horizon still broad.



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