Colour Vision

The Ishihara plates provide a popular and effective method for screening for colour vision defects (Figure 3.4). The patient is presented with a series of plates on which are printed numerous coloured dots. The normal-sighted subject will see numbers on the majority of the plates, whereas the colour-defective patient will fail to see many of the numbers. The test is easy to do and will effectively screen out the more common red-green deficiency found in 8% of the male population. There are other tests available that will measure blue-green defects, for example, the City University test. Other tests, such as the Farnsworth 100 Hue test, are available for the more detailed analysis of colour vision.

Was this article helpful?

0 0

Post a comment