where ravers are using a fluid known as fluoroscein to make their contact lenses turn green under ultra-violet light. The South African Optometric Association issued the warning on Monday.

Sure enough, adjusting the "lumens per watt" slider to search for products with efficacy between 170 and 200 lm/W (which is the maximum the site allows), reveals only one product: a Green Ray RED ...

Researchers have developed a contact lens that ... wavelengths of light in the optical spectrum. Researchers found that the dye blocked the band that lies between the red and green wavelengths ...

All around the country, traffic lights help maintain order on roadways by signaling when it’s time to stop (red), slow down (yellow), or continue (green ... lenses fell off, revealing a white light.