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Glaucoma is a group of conditions that cause a characteristic pattern of damage to the eye that is in part related to an intraocular pressure (eye pressure) that is too high for the eye.
The factors that cause glaucoma are not fully known. However, in many cases the pressure in the eye is thought to be responsible, at least in part, for the damage caused. The pressure in the eye is usually higher than the normal range but in some cases it is within the normal range ( Normal Pressure Glaucoma or Normal Tension Glaucoma) but is considered to be too high for the individual eye.
Other factors that are related to the damage caused include alterations in the blood flow to the optic nerve head (the front part of the optic nerve) , changes in the tissues supporting the optic nerve head, and genetic factors.
Glaucoma can also be caused by various conditions that affect the eye and lead to damage or changes to the trabecular meshwork ( the point where the eye fluid (the aqueous) leaves the eye).
Primary open angle glaucoma is the commonest type of glaucoma and affects 1-2% of the population. It increases with increasing age and is more common in black races than whites. Risk also increases if a family member is affected.
Other eye conditions can cause glaucoma (Secondary glaucoma) as well, such as Pseudo–exfoliation, Pigment dispersion, Uveitis, and it can also be associated with various vascular conditions that affect the eye such as diabetes and vein occlusions ( Rubeotic glaucoma).
Use of steroids may cause a rise in intraocular pressure in some people and can lead to the development of glaucoma. Previous injuries that damage the angle of the eye (angle recession glaucoma), can lead to glaucoma several years after the injury.
Angle closure glaucoma is a rarer condition that occurs when the drainage angle at the front of the eye is narrow and can block off quickly. This can lead to a sudden rise in pressure in the eye, that is associated with blurred vision ,eye pain, headaches, and nausea and vomiting.
Ocular hypertension occurs when the pressure in the eye is above normal and it is a risk factor for developing glaucoma. Depending on how high the pressure is and the thickness of the cornea, we may treat the pressure before you develop glaucoma to try and reduce the risk of getting glaucoma.
Open angle glaucoma and ocular hypertension usually have no symptoms unless it is associated with another condition. Most patients are unaware of their condition and it is discovered only on routine testing by the optician.
For the majority of patients the main problem is loss of the field of vision. Central vision and visual acuity (i.e. the smallest things that can be read on a vision chart) tend to be affected later on, although localised areas of loss of central vision can occur. “Tunnel vision” is only seen in advanced disease.
One important aspect is that it may affect your vision to the level that you fail the legal requirements to drive. You should inform the DVLA and your insurers if you have this condition. Many people however will still meet the legal visual requirements for driving.
Angle closure glaucoma can cause sudden onset of blurred vision, eye pain, headaches and nausea and vomiting.
The usual tests for the diagnosis of glaucoma include a complete eye examination, with measurement of the intraocular pressure, an examination of the drainage angle (gonioscopy), corneal thickness and optic disc, and an assessment of the visual field.
If the tests show a high pressure, loss of the field of vision or damage to the optic nerve then you may have glaucoma or a condition that requires monitoring.
Most patients with open angle glaucoma are treated with eye drops and just require regular follow up. In some patients their results may show changes that are suspicious of glaucoma (for example a suspicious optic disc or ocular hypertension) and they just need monitoring to see if they go on to develop glaucoma. Some patients will require further treatment such as laser or surgery.
Hear what Mrs Gates has to say about her treatment at Midland Eye.
Call us on:
0121 711 2020
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