Division 1: Vision and Colour

Human Colour Vision: 1. Colour Mixture and Retino-geniculate Processing

Normal humans can match any wavelength of light with a combination of three other wavelengths. This capacity, called trichromacy, is due to the presence of three types of cone photopigment in the photoreceptors. These photopigments differ in their peak absorption at either short (S), middle (M), or long (L) wavelengths. A match between two fields of differing spectral distribution occurs when t...

Colour-Vision and Colour-Blindness

Colour vision

The immense range of colours that we see belies the relative simplicity of the system underlying colour vision. We see colours because each of the three distinct types of cone photoreceptor in our retinae is sensitive to a different range of wavelengths of light. The L, M and S cones, colloquially called red (R), green (G), and blue (B), are selective for long, middle and short wavelengths, res...

Colour vision

Editorial Colour vision 2006 is an important bicentenary for the Ulster Medical Society. In 806, the Belfast Medical Society was founded and the later formation of the Belfast Clinical and Pathological Society in 853, allowed amalgamation of both societies to form the current Ulster Medical Society in 862. The vision of the early founders of the Belfast Medical Society, was far sighted, and som...

Colour, vision and ergonomics.

This paper is based on a research project - Visual Communication and Inclusive Design-Colour, Legibility and Aged Vision, developed at the Faculty of Architecture of Lisbon. The research has the aim of determining specific design principles to be applied to visual communication design (printed) objects, in order to be easily read and perceived by all. This study target group was composed by a s...