OPTI 200 Lecture Notes - Lecture 17: Choroid, Retina, Cell Nucleus

• School: University of Arizona
• Department: Optical Sciences
• Course: OPTI 200
• Professor: ALL

Document Summary

Accommodation - change focus by changing focal length of eye lens which is performed by ciliary muscles. Distant object - relaxed muscle, taut ligaments. Near object - tight muscle, slack ligaments. Suspensory ligaments changed focal length of eye lens. In the eye, the iris lies between the cornea and eye lens. Cones are most sensitive to the yellow green and less sensitive to blue. On top of the fovea lies the macula lutea a small yellow pigmented layer that covers the fovea further rejecting blue light. Iris controls light admitted to the eye. The iris stops down to reduce aberrations and increase the depth of field. Resolution the ability to see fine detail. Photo receptors (rods and cones) absorb light. Plexiform layer consists of several types of nerve cells that process the signal is generated by the rods and cones and relay them to the optic nerve. Choroid carries a major blood vessels to nurture the retina.