Scientists have created the first color-blind lenses to help correct this condition.
Previously, tinted glasses with tinted lenses were created for the same, but they turned out to be potentially harmful. In their new work, the researchers used gold nanoparticles to create lenses.
Such routine actions as determining whether a banana is ripe and seeing what kind of light is on at a traffic light are very difficult for color blind people.
Most people with this genetic disorder have problems distinguishing between red and green hues. To do this, the researchers decided to develop special tinted contact lenses, but in clinical trials they leached out the dye, leading to concerns about their safety.
The new gold nanocomposites are non-toxic and have been used for light scattering for many years. To make contact lenses, the researchers uniformly mixed gold nanoparticles into a hydrogel polymer that filtered light in the 520-580 nm range, wavelengths where red and green overlap.
The most effective were contact lenses with gold nanoparticles 40 nm wide, because in tests these particles did not stick together and did not filter more color than necessary. In addition, these lenses were not toxic to the body. The new lenses also matched the wavelength range of colored contact lenses.
According to scientists, the next step in their work will be to conduct clinical trials with humans to assess the comfort and overall experience of wearing the lenses.