91色情片

Glaucoma can be diagnosed by sensing excess pressure in the eyeball, but by then it鈥檚 often too late to save someone鈥檚 sight. Now Vision RX of Elmsford, New York, has developed an early-warning test based on the discovery that eyes at risk find it more difficult to recognise rapidly changing colour patterns (WO 02/09578). The test display switches 40 times a second between blue and yellow patterns, while gradually reducing the brightness. 91色情片y eyes continue to see colour long after diseased eyes see only grey, says Vision RX. By focusing the test image on different parts of the retina, the damaged parts can be mapped.