PS260 Chapter Notes - Chapter 3: Lateral Geniculate Nucleus, Retinal Ganglion Cell, Optic Nerve
Document Summary
Cornea: the transparent tissue at the front of each eye that plays an important role in focusing the incoming light. Lens: the transparent tissue located near the front of each eye that (together with the cornea) plays an important role in focusing the incoming light. Muscles control the degree of curvature of the lens, allowing the eye to form a sharp image on the retina. Retina: the light-sensitive tissue that lines the back of the eyeball. Photoreceptor: a cell on the retina that responds directly to the incoming light; photoreceptors are of two kinds: rods and cones. Rod: a photoreceptor that is sensitive to very low light levels but that is unable to discriminate hues and that has relatively poor acuity. Cones: a photoreceptor that is able to discriminate hues and that has high acuity. Cones are (cid:272)o(cid:374)(cid:272)e(cid:374)t(cid:396)ated i(cid:374) the (cid:396)eti(cid:374)a"s fo(cid:448)ea a(cid:374)d (cid:271)e(cid:272)o(cid:373)e less f(cid:396)e(cid:395)ue(cid:374)t i(cid:374) the (cid:448)isual pe(cid:396)iphe(cid:396)y. ofte(cid:374) contrasted with rod.
