A new study from the UC Davis Eye Center, in collaboration with France’s INSERM Stem Cell and Brain Research Institute, has found that spectral notch filters in spectacles can enhance colour vision for those with anomalous trichromacy.

The EnChroma glasses that contain the filters are designed to increase the separation between colour channels to helps those with anomalous trichromacy see colours more distinctly.

Researchers found that wearing the filtered glasses increased responses to chromatic contrast in individuals with red-green colour blindness.

UC Davis Health professor John S. Werner explained: ‘We found that sustained use over two weeks not only led to increased chromatic contrast response, but, importantly, these improvements persisted when tested without the filters, thereby demonstrating an adaptive visual response.’