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ERIC Number: EJ1029664
Record Type: Journal
Publication Date: 2014-Jun
Pages: 2
Abstractor: ERIC
Reference Count: 2
ISSN: ISSN-1043-4046
A Simple Model of the Accommodating Lens of the Human Eye
Oommen, Vinay; Kanthakumar, Praghalathan
Advances in Physiology Education, v38 n2 p183-184 Jun 2014
The human eye is often discussed as optically equivalent to a photographic camera. The iris is compared with the shutter, the pupil to the aperture, and the retina to the film, and both have lens systems to focus rays of light. Although many similarities exist, a major difference between the two systems is the mechanism involved in focusing an object. In a camera, the focal length of each lens is fixed, and changes in focus are brought about by movement of the lenses. However, in the human eye, changes in focus are brought about by changes in the power of the lens by varying its curvature. Functional models of the eye are commercially available. Current prices of such models range from $400 upward. This article describes a simple and inexpensive model to illustrate the change in curvature of the human lens during accommodation.
American Physiological Society. 9650 Rockville Pike, Bethesda, MD 20814-3991. Tel: 301-634-7164; Fax: 301-634-7241; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A