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A claim from researchers in the US that they have developed spectables which can reduce the effects of colour blindness. This works mainly with the red-green colour blindness. Daniel Bor is,a neurologist at the University of Sussex and also red-green colour blind. He volunteered to test the spectacles after Mark Chanigzi, co-inventor of the Oxy-Iso glasses, said he began to receive letters from people with red-green colour blindness.
Bor completed the test, the Ishihara plate test, wearing glasses during normal activities. He noted that the colour spectrum suffered and yellow lghts were actually visable. His score was in fact nil without the spectacles. Bill Harvey, the Optician clinical editor said that the Ishihara test relies on presenting mixes of two colours which fall within the isochromatic zones of protan or deutan defectives, while being perceived as different to those with normal colour perception in whom the large isochromatic bands are absent.
As a student, you would know that the lighting used for these knid of tests is essential. The wrong source may well render some of the targets such that, they may actually be perceived as no longer isochromatic.