Original Research

Chromagen lenses and abnormal colour perception

O. Matthew Oriowo, Abdullah Z Alotaibi
African Vision and Eye Health | South African Optometrist: Vol 70, No 2 | a101 | DOI: https://doi.org/10.4102/aveh.v70i2.101 | © 2011 O. Matthew Oriowo, Abdullah Z Alotaibi | This work is licensed under CC Attribution 4.0
Submitted: 11 December 2011 | Published: 11 December 2011

About the author(s)

O. Matthew Oriowo, Department of Optometry, Faculty of Health Sciences, University of Limpopo, South Africa
Abdullah Z Alotaibi, Department of Optometry, College of Applied Medical Sciences, King Saud University, Saudi Arabia

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Abstract

Background: The Chromagen lens system comprises of tinted spectacle or contact lenses, each with a specific colour wavelength filter which controls the spectra of the light entering the eye. This study investigated whether spectacle-mounted Chromagen lenses would enhance colour perception in individuals with abnormal colour vision.

Methods: The Ishihara colour test was used to test for colour vision deficiency (CVD) and also to evaluate the effect of the Chromagen spectacle lens on colour perception in 13 subjects. An Oculus
Anomaloscope was used to confirm and sub-classify the types of CVD. Subjects comprised of school age children from the Riyadh area in Saudi Arabia.

Results: The distribution amongst the male participants comprised two subjects with protanomaly, two with protanopia, five with deuteranomaly, and two with deuteranopia. Amongst the two female participants, one subject showed deuteranomaly, and one showed protanomaly. Different types of Chromagen spectacle lenses displayed some levels of colour vision enhancement depending on type of CVD.

Conclusion: The findings support the notion that chromagen lenses could enhance colour vision perception in some cases of red-green colour vision defects. Clients with CVD should be managed on an individual case basis. (S Afr Optom 2011 70(2) 69-74)

 


Keywords

Chromagen lenses; colour vision deficiency; Ishihara colour test; anomaloscope

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