Light and Sight

Non-Visual Photoreception: Sensing Light without Sight

Recent work in blind human subjects has confirmed the presence of a non-visual ocular photoreceptive mechanism similar to that described in blind mice. This system appears to subserve circadian photic entrainment, the pupillary light response, and a number of other aspects of neurophysiology and behavior.

Sight and Life

Timing sight and sound

It has been proposed that there is a perceptual compensation for the difference between the speeds of light and sound. We examined this possibility using a range of auditory-visual tasks, in which performance depends on the relative timing of auditory and visual information, and manipulated viewing distance to test for perceptual compensation. We explored auditory-visual integration, cross moda...

First sight

But despite the portrait and interrogation by doctors in London, Jesty never received credit for his pioneering work, with all the credit and financial rewards going to Jenner with his many friends in the medical establishment in London who spent considerable time and money refining the technique. Jenner never accepted that he had been preempted over vaccination by Jesty. However, the Jestys fr...

Sight Testing

By p. Davidson, iyi^. frice Vs. 6d. This little volume on sight testing lias now reached its fifth edition and would therefore appear popular with the practitioner. The author lays great stress on the importance of the general practitioner including, in his daily work, that of refraction and the prescription of glasses to his patients direct. The author undertakes in his book to teach a simple ...