Glasses fix Color Blindness March 14, 2015Posted by Retired Geezer in Heroes.
Imagine being unable to see the difference between red and green: a stop sign would be the same color as a tree. Picture a purple orchid, the fiery oranges and pinks in a sunset, or a rainbow—people with color blindness have never seen these things.
For the vast majority of 300 million people worldwide who have color vision deficiency (CVD) the key to seeing a full spectrum of colors for the first time is an ordinary-looking pair of sunglasses, with some extraordinary science behind them.
Color Blindness is Really Color Weakness
Our vision is based on cone cells, three types of light-sensitive nerve cells found in the retina, which allow us to see red, green and blue. A genetic condition causing red-green color blindness, the most common type of CVD, causes the red and green sensing cones’ functions to overlap more than normal. These overlaps weaken the signal of color information sent to the brain, causing shades of green, orange, brown, red, pink and purple to appear muddied or washed out.
This is the result:
Look at the difference when wearing the glasses.
Seeing is Believing
The million dollar machines EnChroma uses are the same as those used to make optical parts in satellites and lasers, so it should come as no surprise that prices for the special sunglasses start in the low $300’s.
For someone who’s seeing life in full color for the first time, that’s a bargain.