DYED CONTACT LENSES COULD HELP CORRECT COLOUR BLINDNESS
While the use of contact lenses is common in correct vision, their use in correcting colour blindness has, so far, been less so. But researchers at the University in Birmingham have developed a contact lens that uses a safe low-cost dye to rectify the issue. The most common form of colour blindness is the inability to distinguish between red and green, meaning sufferers see a muddy yellow, causing issues with things like traffic lights. The newly developed contact lenses utilise a dye made out of rhodamine, which absorbs certain wavelengths of light between red and green. When those wavelengths are blocked, light is better absorbed by the red-sensitive and green-sensitive cones in the eye, allowing the sufferer to distinguish between the two colours. The next step is to develop a similar process to correct purple-blue blindness.