By means of this simple red-green test we can diagnose common refractive defects such as myopia and hypermetropia.
HOW TO CARRY OUT THIS TEST
Please place yourself about two metres away from the screen, cover one eye, observe the letters shown on both backgrounds of the chart and tell on what colour you see them sharper. Then cover the other eye and repeat the same exercise.
RED-GREEN TEST RESULTS
If you can see the letters on both colours equally sharp, apparently you haven’t got any refractive defects that require optical correction. If you use glasses and wearing them on you see both equally sharp, they are supposedly well prescribed.
If you see sharper characters on the red background half, you may suffer from myopia. In case you wore glasses already to correct it, then you might be undercorrected. If you are long-sighted you may be overcorrected.
If you see sharper characters on the green background half, you may suffer from hypermetropia. In case you wore glasses already to correct it, then you might be undercorrected. If you are short-sighted you may be overcorrected.
We advise you having your eyes tested by an ophthalmologist if you saw sharper characters on one colour scale than on the other.