In his investigations on colour blindness, Dr. Houstoun produced two identical patches of colour on a screen; one of these patches was gradually altered until a difference in tint could just be observed. These two patches were at a distance of 8 mms. apart on the screen, and Dr. Houstoun suggested that if these patches were juxtaposed the observer's colour sensitivity might be improved. The following communication records the results of investigations carried out under that suggested condition.

The use of eyewear as a platform for mobile display systems is gaining acceptance, owing to the high degree of miniaturization that is now possible in optics, electronics, and microdisplays. Eyewear offers unique features for display integration. This paper will review important aspects of eyewear display design and provide a progress report on eyewear display development.

This paper reports the successful construction and demonstration of a lightweight wearable stereoscopic display. The imaging element is an active matrix liquid crystal display. The optics are specially designed for wearable, portable applications and comprise a color corrected refractive magnifying system. The diagonal field of view of the VGA system is 20 degrees.