Week12

is the region of highest visual acuity, has the highest light threshold

cornea, dorsal face of the lens, sclera, frontal face of the lens

convergence of eyeballs, miosis, lens more convex

organized into on-center, off-surround receptor fields, responsible for the high visual acuity of visual system, provide information about the color of an object

larger in size, not located within the fovea

blue, red, green

bipolar cell, cone, rod, horizontal cell

light induces hyper polarization of photoreceptors., cones are responsible for photonic vision, retinal is bound to opsin in its 11 cis retinal form in the absence of light activation, photopigments are located in the outer segments of the photoreceptors

vitamin A is necessary for photoreceptors, in darkness the cGMP in the receptor is relatively high, in light the membrane potential can decrease to -80mV

part of optic nerve fibers decussate in the chiasm, non crossed fibers of the optic tract originate from the temporal parts of the retinas., the optic radiation ends in the primary visual cortex

is a special form of lateral inhibition, will enhance visual contrast

photopigments can be located in the stacks of disc membranes of the cones, the human eye senses the light in the 400-700nm wavelength range