Optical Pertaining to vision or its organ, or to the science of optics. O. Angle. See Angles, Table of. O. Atrophy, atrophy of the optic nerve. See Atrophy. O. Axis, the axis of the eye. O. Center, the point in the main axis of the crystalline lens at which the rays of light meet. Also applied to the nervous center concerned in the visual function. O. Chiasm. See Commissure, Optic. O. Commissure. See Commissure. O. Cup, the concave area formed by the involution of the distal extremity of the primary optic vesicle. O. Disc. See Disc. O. Foramen. See Foramina, Table of. O. Groove, the groove on the sphenoid bone for the optic chiasm. See Groove. O. Lobes, the corpora quadrigemina. O. Nerve. See Nerves. O. Neuritis. See Papillitis. O. Papilla. See Disc, Optic. O. Radiations, the term given by Gratiolet to the large fasciculus of nerve-fibers joining the corona radiata of the optic thalamus and the occipital lobe of the cerebrum. O. Section. See Section. O. Stalk, a soft process on the head of molluscs supporting an eye; an ommatophore. O. Thalamus. See Thalamus. O. Tract. See Tract. O. Vesicle, in embryology, a diverticulum from each side of the primary anterior vesicle, which forms the basis of the future eye.
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