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The optic nerve can be damaged when exposed to direct or indirect injury. Direct optic nerve injuries are caused by trauma to the head or orbit that crosses normal tissue planes and disrupts the anatomy and function of the optic nerve; e.g., a bullet or forceps that physically injures the optic nerve.
The anterior optic nerve receives blood primarily from the posterior ciliary arteries. The anterior optic nerve, a.k.a. the optic nerve head, is surrounded by the scleral canal, and is vulnerable to crowding of nerve fibers. The portion of the optic nerve head that is visible by looking into the eye with an ophthalmoscope is called the optic disc.
Glaucoma is a group of eye conditions that damage the optic nerve, usually due to high pressure in the eye. ... glasses, contact lenses, and surgery are used to correct them as necessary. Other ...
The surgery aims to cover the thinning posterior pole with a supportive material to withstand intraocular pressure and prevent further progression of the posterior staphyloma. The strain is reduced, although damage from the pathological process cannot be reversed. By stopping the progression of the disease, vision may be maintained or improved.
Principal causes of secondary glaucoma include optic nerve trauma or damage, [2] eye disease, surgery, neovascularization, [3] tumours [4] and use of steroid and sulfa drugs. [2] Risk factors for secondary glaucoma include uveitis, [ 1 ] cataract surgery [ 5 ] and also intraocular tumours. [ 5 ]
In these cases, an ophthalmologist maintains optic health by administering pre-surgical treatment, advising proper surgical techniques so that the optic nerve is not in danger, and managing post-surgery eye care. Common problems include: [citation needed] Visual field defects; Reduced visual activity; Visually evoked potential (VEP) abnormalities
The optic nerve is the bundle of axons that carry the visual signals from the eye to the brain. This optic nerve must penetrate through the wall of the eye, and the hole to accommodate this is usually 20-30% larger than the nerve diameter. In some patients the optic nerve is nearly as large as the opening in the back of the eye, and the optic ...
The clinically important structures surrounding the orbit include the optic nerve at the apex of the orbit as well as the superior orbital fissure which contains cranial nerves 3, 4, and 6 therefore controlling ocular muscles of eye movement. [15] Inferior to the orbit is the infraorbital nerve which is purely sensory.