Glaucoma22:04 Nov 25 2009
Times Read: 954
So I went to the eye doctor today for the first time in a long while. Finally to get my new spectacles he told me he would have to refer me to a Glaucoma specialist and assure me that there's nothing to worry about. I don't get why they would say that but yet send me to a specialist.
For those that may not know what Glaucoma is
Glaucoma is a disease that affects the optic nerve and involves loss of retinal ganglion cells in a characteristic pattern. There are many different sub-types of glaucoma but they can all be considered as a type of optic neuropathy. Raised intraocular pressure is a significant risk factor for developing glaucoma (above 22 mmHg or 2.9 kPa). One person may develop nerve damage at a relatively low pressure, while another person may have high eye pressure for years and yet never develop damage. Untreated glaucoma leads to permanent damage of the optic nerve and resultant visual field loss, which can progress to blindness.
Glaucoma can be divided roughly into two main categories, "open angle" and "closed angle" glaucoma. Closed angle glaucoma can appear suddenly and is often painful; visual loss can progress quickly but the discomfort often leads patients to seek medical attention before permanent damage occurs. Open angle, chronic glaucoma tends to progress more slowly and the patient may not notice that they have lost vision until the disease has progressed significantly.
Glaucoma has been nicknamed the "sneak thief of sight" because the loss of vision normally occurs gradually over a long period of time and is often only recognized when the disease is quite advanced. Once lost, this damaged visual field can never be recovered. Worldwide, it is the second leading cause of blindness.[1] Glaucoma affects 1 in 200 people aged fifty and younger, and 1 in 10 over the age of eighty. If the condition is detected early enough it is possible to arrest the development or slow the progression with medical and surgical means.
The major risk factor for most glaucomas and focus of treatment is increased intraocular pressure. Intraocular pressure is a function of production of liquid aqueous humor by the ciliary processes of the eye and its drainage through the trabecular meshwork. Aqueous humor flows from the ciliary processes into the posterior chamber, bounded posteriorly by the lens and the zonules of Zinn and anteriorly by the iris. It then flows through the pupil of the iris into the anterior chamber, bounded posteriorly by the iris and anteriorly by the cornea. From here the trabecular meshwork drains aqueous humor via Schlemm's canal into scleral plexuses and general blood circulation.[2] In open angle glaucoma there is reduced flow through the trabecular meshwork;[3] in angle closure glaucoma, the iris is pushed forward against the trabecular meshwork, blocking fluid from escaping.
The inconsistent relationship of glaucomatous optic neuropathy with ocular hypertension has provoked hypotheses and studies on anatomic structure, eye development, nerve compression trauma, optic nerve blood flow, excitatory neurotransmitter, trophic factor, retinal ganglion cell/axon degeneration, glial support cell, immune, and aging mechanisms of neuron loss.[4][5][6][7][8][9][10][11][12][13][14]
The major types of glaucoma are discussed below.
"Glaucoma." Wikipedia, The Free Encyclopedia. 25 Nov 2009, 14:16 UTC. 25 Nov 2009 .
For more information visit Glaucoma
COMMENTS
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LadyDarkRayne
06:01 Nov 30 2009
Ya I have. Days like that too Fiz... hugs.