The Eye: Window to the World

angle appear aqueous artist astigmatic bipolar blind blood vessels blue brain called camera cataracts century chemical choroid chromosomes color vision colorblindness contact lenses cornea created dark depth cues detect device disease distance distortion E. H. Gombrich experiment eye movement eye's eyeball farsightedness fluid focus fovea ganglion cells glass glaucoma Helmholtz Hermann von Helmholtz Huygens illusion illusory impulses inverted iris Kepler kittens Kühne lacrimal layer lens Leonardo light rays lines look ment mind move 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 refractive errors respond retina rhodopsin saccade scene scientists sclera sense sensitive shape sight signals spectrum spot striate cortex surface surgeon theory three-dimensional tiny tion tissue visual cortex visual field visual ray visual system vitamin vitreous wavelengths waves yellow