Glossary

Glossary

Anomalous trichromats

People with problems seeing and distinguishing colours in the same ways as those with normal vision; they can have deuteranomaly or protoanomaly.

Colour blindness

A term referring to colour vision deficiency.

Colour vision deficiency

Difficulty with seeing differences between (some or all) colours that other people can see. Also sometimes referred to as colour blindness.

Cones

The three types of cone cells in the retina of the eye absorb light from different parts of the spectrum and hence allow us to perceive colour.

Dichromats

People how cannot see some hues in the spectrum; one of their three types of cone cells is dysfunctional.

Deuteranomaly (Mild)

A colour vision deficiency where there is a reduction in sensitivity to the green end of the spectrum.

Deuteranomaly (Moderate)

A colour vision deficiency where there is a reduction in sensitivity to the green end of the spectrum.

Deuteranopia (Severe)

A colour vision deficiency where cones sensitive to green end of the spectrum are missing. Like protanopes, deuteranopes have difficulty perceiving red-green hues.

Protanomaly (Mild)

A colour vision deficiency where there is a reduction in sensitivity to the red end of the spectrum.

Protanomaly (Moderate)

A colour vision deficiency where there is a reduction in sensitivity to the red end of the spectrum.

Protanopia (Severe)

A colour vision deficiency where cones sensitive to red end of the spectrum are missing. Protanopes have difficulty perceiving red-green hues.

Trichromats

People with normal colour vision.