The Eye: Window to the World

angle appear artist astigmatic bipolar blind blood vessels blue brain called camera cataracts century choroid chromosomes ciliary color vision colorblindness cones contact lenses cornea created dark depth cues device disease distance distortion E. H. Gombrich experiment eye's eyeball fluid focus fovea ganglion cells glass glaucoma green Helmholtz Hermann von Helmholtz horizontal Hubel Huygens illusion illusory impulses inverted iris Kepler kittens Kühne layer lens Leonardo lines look ment mind moon move muscles nearsightedness nerve cells nerve fibers neurons Newton normal objects ophthalmologist ophthalmoscope Opsin optic nerve painting patient's perceived perception photoreceptors physician pigment presbyopia primary colors pupil rays of light receptive field rectus refractive refractive errors respond retina rhodopsin rods saccade scene scientists sclera sensitive shape sight signals spectrum striate cortex surface surgeon theory three-dimensional tiny tion tissue visual cortex visual field visual ray visual system vitamin vitreous wavelengths waves Wiesel yellow