BIO 365S Lecture Notes - Lecture 12: Visual System, Retina, Retinal Ganglion Cell
Light: A narrow band of electromagnetic
Light: A narrow band of electromagnetic radiation
that can be conceptualized as a wave or a stream
of photons
Visual system can only detect the small range of
band of electromagnetic light.
Retina helps light focus perfectly on the fovea. On the inside of the
eyeball.
For clear vision, the focal point must fall on
the retina.
Light bends a little bit when going into the eye, and bends a lot as enter
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Document Summary
Light: a narrow band of electromagnetic radiation that can be conceptualized as a wave or a stream of photons. Visual system can only detect the small range of band of electromagnetic light. Retina helps light focus perfectly on the fovea. For clear vision, the focal point must fall on the retina. Light bends a little bit when going into the eye, and bends a lot as enter eye through lenses in order to focus on the fovea. Shape of lens changes how the light bends, and changes length. Changes in lens shape are controlled by the ciliary muscle. Iris = eye color, creates opening = pupil. Light strikes the photoreceptors in the fovea directly because overlying neurons are pushed aside. In the center has fovea = sharpest part of the eye. S(cid:395)uid = puts (cid:396)eti(cid:374)a o(cid:374) the outside, so it"s (cid:373)o(cid:396)e supe(cid:396)io(cid:396). Rod = 1; rhodopsin = respond to visible light.
