The effect of abnormal colour vision on the ability to identify and outline coloured clinical signs and to count stained bacilli in sputum
Article first published online: 9 JUN 2009
Clinical and Experimental Optometry
Volume 88, Issue 6, pages 376–381, November 2005
How to Cite
Campbell, J. L., Griffin, L., Spalding, J. A. B. and Mir, F. A. (2005), The effect of abnormal colour vision on the ability to identify and outline coloured clinical signs and to count stained bacilli in sputum. Clinical and Experimental Optometry, 88: 376–381. doi: 10.1111/j.1444-0938.2005.tb05103.x
- Issue published online: 9 JUN 2009
- Article first published online: 9 JUN 2009
- Revised: 16 May 2005; Accepted for publication: 18 June 2005
- colour in medical diagnosis;
- congenital colour vision deficiency;
- occupational handicap
Aim: To determine if medical practitioners with congenital colour vision deficiencies (CCVD) are less able to identify and delineate the extent of coloured abnormal signs than those with normal colour vision.
Method:Twenty-two medical practitioners with CCVD and 17 with normal colour vision, matched for age and gender, were shown 10 photographs. They were asked to identify and outline the extent of the clinical sign in eight that were of vomit or stool (six of these showing fresh blood), one of a skin rash and for one to mark the position of bacilli in sputum stained by the Ziehl-Neelsen method.
Results:There were statistically significant differences between the CCVD practitioners and those with normal colour vision in their ability to outline abnormalities in five of the six photographs that showed fresh blood, in the photograph of a rash and in marking the position of bacilli in the photograph of a stained slide.
Conclusion:Medical practitioners with CCVD are handicapped in their evaluation of the presence and extent of coloured clinical signs. Medical schools should ensure that students with CCVD are aware of their deficiency and know its severity, so they can take special care in clinical practice.