About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 55. Chapters: Eye, Retina, Optic chiasm, Optic nerve, Human eye, Visual modularity, Photosensitive ganglion cell, Smooth pursuit, George Wald, Lateral geniculate nucleus, Visual phototransduction, Phosphene, Two Streams hypothesis, Saccadic masking, Retinal ganglion cell, List of systemic diseases with ocular manifestations, Trichromacy, Phantom eye syndrome, Choroid, Retinotopy, Glob, Saccadic suppression of image displacement, Greyout, Koniocellular cell, Optic radiation, Grassmann's law, Visual routine, Optic tract, Prisoner's cinema, Emmetropia, Simple cell, Monocular deprivation, Parvocellular cell, Magnocellular cell, Pretectal area, Cortical magnification, Complex cell, Ocular dominance column, Midget cell, Orienting system, Bistratified cell, Cyclopean stimuli, Optokinetic reflex, Parasol cell, Reduced eye, Foveola, Choroid fissure, Vision for perception and vision for action, Redout, Hypercomplex cell, Medial eye fields, Optic cup, Visual processing. Excerpt: Eyes are organs that detect light and convert it to electro-chemical impulses in neurons. The simplest photoreceptors in conscious vision connect light to movement. In higher organisms the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain through complex neural pathways that connect the eye via the optic nerve to the visual cortex and other areas of the brain. Eyes with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in molluscs, chordates and arthropods. The simplest "eyes," such as those in microorganisms, do nothi...
