This book consists of articles from Wikia or other free sources online. Pages: 85. Chapters: Abducens nerve, Accommodation reflex, Amacrine cells, Annulus of Zinn, Anterior chamber, Anterior segment, Aqueous humour, Astigmatism, Astigmatism, Biochemistry of the retina, Bipolar cell of the retina, Brownout, Bruch's membrane, Channelrhodopsin-2, Choroid, Ciliary muscles, Color receptors, Compound eye, Cones, Conjunctiva, Contrast threshold function, Convergence, Convergence micropsia, Cornea, Corneal endothelium, Dark adaptation, Divergence, Drusen, Evolution of the eye, Eye, Eye color, Eye colour, Eye disorders, Eye movements, Fixation reflex, Fixational eye movement, Frontal eye fields, Ganglion cell layer, Ganglion cells, Ganglion cells, Giant retinal ganglion cells, Horizontal cell, Hyperopia, Inferior oblique muscle, Inferior rectus muscle, Lacrimal canaliculi, Lacrimal glands, Lacrimal sac, Lacrimal system, Lateral rectus muscle, Lens, Levator palpebrae superioris muscle, List of eye diseases and disorders, Macula, Mesopic vision, Microsaccade, Miosis, Nictating membrane, Nictitating membrane, Ocular accommodation, Ocular tremor, Oculomotor muscles, Optic cup, Optic disc, Optic stalk, Optic vesicles, Photopic vision, Photoreceptor cells, Photosensitive ganglion cell, Photostimulation, Presbyopia, Pupil, Pupil dilation, Retina, Retinal pigment epithelium, Rhabdom, Rhodopsin, Schlemm's canal, Sclera, Scotopic vision, Stabilized images, Superior rectus muscle, Tapetum lucidum, Tears, Trabecular meshwork, Uvea, Vergence, Visual prosthesis, Visual tracking, Vitreous humour, Zonule of Zinn. Excerpt: The abducens nerve (the sixth cranial nerve, also called the sixth nerve or simply VI) is a motor nerve (a "somatic efferent" nerve) that controls the movement of a single muscle, the lateral rectus muscle of the eye. Homologous abducens nerves are found in all vertebrates except lampreys and hagfishes. The Latin name for the sixth cranial nerve is nervus abducens. The...