Is the Eye Smart or the Brain Forgiving.
ILLINOIS UNIV AT URBANA-CHAMPAIGN DEPT OF PSYCHOLOGY
Pagination or Media Count:
Somehow we see things clearly, or at least are unaware that they are unclear, when in fact the images on our retinas are badly out of focus as determined by an infrared optometer. Although the average accommodation distance may be far from the distance of the viewed object, the more or less rhythmic fluctuations in accommodation distance are sufficiently large to bring an out-of-focus object into focus momentarily every so often, at which times it may be sampled by the brain. Furthermore, if objects are brought into focus regardless of accommodation distance by the use of a small artificial pupil, the accommodative mechanism will quickly lapse toward its intermediate resting position and then, after a minute or two for many subjects, will embark upon a series of extreme fluctuations, as if searching for an out-of-focus image to back away from. These and other incidental experimental observations are now subjects of an ongoing systematic investigation. Author
- Anatomy and Physiology