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Colorimetry is the science of the measurement of colour, replacing subjective responses of colours with an objective numerical system. It plays an important role in all areas where colour generation, rendition and perception are involved. Perception of the colour of an object is governed by three factors: the nature of the illumination, the optical properties of the object itself and the response of the human eye. 

Discover how colour can alleviate visual discomfort and help with dyslexia.

Visual stress is a term used to describe visual discomfort and perceptual distortions in the printed text, suffered by many people who struggle to read. The condition is estimated to be present in about 40 % of poor readers and in 20 % of the general population in varying degrees.


Coloured overlays can improve reading speed and accuracy. They can enable longer periods of reading free of discomfort. When they do, it is an indication that the individual may benefit from Precision Tinted Lenses. The lenses are prescribed using specialist equipment called a Colorimeter.

Women having an eye exam
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