Coloured Filters

Vision for people with some eye diseases can be improved by using colour filters.  The filters recommended to aid certain conditions are outlined in the table below:

Colour Filters Chart

Filters absorb the short wave, high-energy ultraviolet and blue elements of the light so enhancing contrast and reducing photosensitivity. Filter colours differ depending on the absorption range, which is how much ultra violet light is filtered out. The higher the number the more UV light is absorbed by the filter and the less light is transmitted through to the eye.

Colour Selection
Each filter colour gives an outline of the uses and eye conditions that they are particularly recommended for but selection can also be made on cosmetic colour choice together with the amount of light transmission needed for the tasks to be undertaken whilst wearing them.

Polarising filters
The filters are also available with an additional polarising filter.  A polarising filter allows light to enter the lens of the eye in a specific direction whilst absorbing other light.  Its effect is to remove reflections from a shiny surface.