Colours in sight

to a British optician, even colour-blind people can now see red. Literally. David Harris, a uk -based medi cal expert, has developed lenses specially designed for people suffering from colour blindness. Though this fairly common eye disorder has no medical cure, Harris' invention, called chromatin, represents an important step along the road to finding one.

Colour blindness is caused by defective cells in the macula , a part of the retina. Harris discovered that enhanced colour differentiation can be achieved when individually-tailored precision tints are applied to the centre of normal contact lenses.

Harris, a research and constancy practitioner at the Corneal Laser Centre in Wirral, uk , has developed as many as 26 lenses

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