Colour Vision

Around 8% of UK males have red/green colour deficiency (deuteranomoly)

Acquired colour problems suggest optic nerve or retinal problems. Test colour vision when suspecting

  • Optic neuritis
  • Graves Orbitopathy (GO)

The simplest (and best screening) test for aquired colour defect is subjective red desaturation:

Show the patient a red top specimen bottle to each eye in turn. Ask whether the brightness and redness of the colour was the same.

For a more repeatable test, use the Ishihara colour testing book, plates 1-17.

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