| optic glioma | <oncology, tumour> A tumour of the optic nerve that can result in blindness to the pressure and destruction (caused by the tumour) of the optic nerve. There is an association between optic gliomas and neurofibromatosis. Surgical excision or radiation therapy is the general coarse of treatment. (27 Sep 1997) |
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| optic groove | The groove on the upper surface of the sphenoid bone running transversely between the optic canals bounded anteriorly by the sphenoidal limbus and posteriorly by the tuberculum sellae; forms in relationship to the optic chiasm. Synonym: sulcus prechiasmatis, chiasmatic sulcus, optic groove, prechiasmatic sulcus. (05 Mar 2000) |
| optic layer | A layer of white matter interspersed with nerve-cell bodies, immediately below the superficial gray layer of the superior colliculus, composed of myelinated fibres originating in the retina and striate cortex, the inner layer of the retina, consisting of the fibres originating from the cells of the ganglionic layer of optic nerve; in their further course these fibres combine to form the optic nerve or optic tract. Synonym: stratum opticum. (05 Mar 2000) |
| optic lobe | In invertebrate zoology, a lateral lobe of the forebrain in certain arthropods. In vertebrate zoology, either of the corpora bigemina of lower vertebrates. (12 Dec 1998) |
| optic nerve | <anatomy, nerve> The optic nerve. The nerve carrying impulses for the sense of sight. Projection from the vertebrate retina to the midbrain. Embryologically, a CNS tract rather than a peripheral nerve. Popular experimental preparation for studies of regeneration of retino tectal projections in lower vertebrates and also for studies of glial cell lineage in CNS. Synonym: cranial nerve II. (18 Nov 1997) |
| optic nerve diseases | Diseases of the optic nerve. (12 Dec 1998) |
| optic nerve drusen | Basophilic, calcareous, laminated acellular bodies within the optic nerve anterior to the scleral lamina cribrosa. (05 Mar 2000) |
| optic nerve glioma | <radiology> F = M, child / young adult (75% less than 10 yrs, 90% less than 20 yrs), fusiform, isodense mass, with or without enhancement, rarely calcified associated with neurofibromatosis Cf: optic nerve meningioma (12 Dec 1998) |
| optic nerve head | The portion of the optic nerve seen in the fundus with the ophthalmoscope. It is formed by the meeting of all the retinal ganglion cell axons as they enter the optic nerve. Because the retina at the optic disk has no photoreceptors there is a corresponding blind spot in the visual field. (12 Dec 1998) |
| optic nerve hypoplasia | Congenitally small optic disk resulting from failure of development of retinal ganglion cells, with a reduced number of axons; visual impairment may be marked. See: de Morsier's syndrome. (05 Mar 2000) |
| optic nerve meningioma | <radiology> Female (80%), middle age, (24% occur before 10 yrs, but are associated with neurofibromatosis), tubular, hyperdense mass, intense tramtrack enhancement, ** Cf: optic nerve glioma (12 Dec 1998) |
| optic nerve sheath decompression | A venting of the optic nerve sheath into the retrobulbar space, by slitting or by fenestrating the sheath. See: optic nerve sheath fenestration. (05 Mar 2000) |
| optic nerve sheath fenestration | The cutting of a window in the dura of the optic nerve sheath to relieve papilledema and prevent further loss of optic nerve fibres. (05 Mar 2000) |
| optic neuritis | <pathology> Inflammation of the optic nerve. This may occur secondary to a wide variety of causes: multiple sclerosis, posterior uveitis, vascular lesions of the optic nerve (interruption of blood supply to the optic nerve), temporal arteritis, central retinal artery occlusion, methyl alcohol poisoning, drug side effects and acute demyelinative disease of the optic nerves (destruction of optic nerve sheath). (27 Sep 1997) |
| optic neuroma | A benign tumour of the optic nerve. (12 Dec 1998) |
Synonyms : Blind Spots, Disk, Optic, Disks, Optic, Head, Optic Nerve, Heads, Optic Nerve, Nerve Head, Optic, Nerve Heads, Optic, Optic Disks, Optic Nerve Heads, Optic Papillas, Papilla, Optic, Papillas, Optic, Spot, Blind, Spots, Blind
Synonyms : Drusen, Optic Disc, Optic Disc Drusen, Optic Disc Drusens, Optic Disk Drusens, Optic Nerve Drusen
Synonyms : Bigemina, Corpora, Lobe, Optic, Lobes, Optic, Optic Lobes
Synonyms : Cranial Nerve IIs, Cranial Nerve, Second, Cranial Nerves, Second, II, Cranial Nerve, IIs, Cranial Nerve, Nerve II, Cranial, Nerve IIs, Cranial, Nerve, Optic, Nerve, Second Cranial, Nerves, Optic, Nerves, Second Cranial, Optic Nerves, Second Cranial Nerves
Synonyms : Cranial Nerve II Disorder, Neural-Optical Lesion, Disk Disorder, Optic, Disk Disorders, Optic, Foster Kennedy Syndrome, Lesion, Neural-Optical, Lesions, Neural-Optical, Neural Optical Lesion, Neural-Optical Lesions, Neuropathies, Optic, Neuropathy, Optic
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| optician |
a worker who makes glasses for remedying defects of vision
Ãâó: wordnet.princeton.edu/perl/webwn
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| optics |
the branch of physics that studies the physical properties of light
Ãâó: wordnet.princeton.edu/perl/webwn
|
| optimism |
the optimistic feeling that all is going to turn out well a general disposition to expect the best in all things
Ãâó: wordnet.princeton.edu/perl/webwn
|
| optimum |
most favorable condition or greatest degree or amount possible under given circumstances most desirable possible under a restriction expressed or implied; "an optimum return on capital"; "optimal concentration of a drug"
Ãâó: wordnet.princeton.edu/perl/webwn
|
| optometrist |
a person skilled in testing for defects of vision in order to prescribe corrective glasses
Ãâó: wordnet.princeton.edu/perl/webwn
|
| OPT | the crossing of the optic nerves from the two eyes at the base of the brain |
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| OPT | the crossing of the optic nerves from the two eyes at the base of the brain |
| OPT | (embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina |
| OPT | the point where the optic nerve enters the retina |
| OPT | the point where the optic nerve enters the retina |
| OPT | serves the retina |
| OPT | serves the retina |
| OPT | of or relating to or involving light or optics |
| OPT | relating to or using sight |
| OPT | of or relating to or resembling the eye |
| OPT | an optical phenomenon resulting from the failure of a lens or mirror to produce a good image |
| OPT | apparatus for observation and measurement of optical phenomena |
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