The Eye: Window to the World

Alhazen angle appear 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 E. H. Gombrich experiment eye movement eye's eyeball farsightedness fluid focus fovea ganglion cells glass glaucoma Helmholtz Hermann von Helmholtz horizontal Huygens illusion illusory impulses inverted iris Kepler kittens Kühne layer lens Leonardo light rays lines look ment mind move muscles nerve cells nerve fibers neurons Newton normal objects ophthalmologist ophthalmoscope 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 striate cortex surface surgeon theory three-dimensional tiny tion tissue trabecular meshwork visual cortex visual field visual ray visual system vitamin vitreous wavelengths waves yellow