A Simple Model of the Accommodating Lens of the Human Eye

Autor/inn/en	Oommen, Vinay; Kanthakumar, Praghalathan
Titel	A Simple Model of the Accommodating Lens of the Human Eye
Quelle	In: Advances in Physiology Education, 38 (2014) 2, S.183-184 (2 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1043-4046
DOI	10.1152/advan.00105.2013
Schlagwörter	Human Body; Physiology; Vision; Photography; Models; Anatomy; Medical Students; Medical Education + Suchen Sie Ihr Suchwort? Menschlicher Körper; Physiologie; Fotografie; Analogiemodell; Anatomie; Medizinische Ausbildung
Abstract	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. (ERIC).
Anmerkungen	American Physiological Society. 9650 Rockville Pike, Bethesda, MD 20814-3991. Tel: 301-634-7164; Fax: 301-634-7241; e-mail: webmaster@the-aps.org; Web site: http://advan.physiology.org/
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10