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Patients who have normal-tension glaucoma are thought to have more susceptible optic nerves, such that even at normal eye pressures the optic nerve slowly degenerates. Moreover, even though the eye pressure is “normal,” the treatment is the same: lowering the eye pressure through medications, laser, or surgery.
What Is Considered Normal Eye Pressure? Unfortunately, the answer is not any single number. While the average eye pressure is approximately 15, the range of normal eye pressure is much larger. About 90 percent of people will fall between a pressure of 10 and 21. Even so, this does not mean that if you have a pressure of 22 or higher it is abnormal.
The laser beam is aimed and multiple laser “shots” are placed into the iris. (Laser surgery is not painful although the patient may feel a “pop” in the eye or an occasional pin-prick type sensation.) At the end of the laser peripheral iridotomy surgery, the contact lens is removed and the eye rinsed out.
Primary open-angle glaucoma occurs due to a deeper issue, that impacts the eye's natural drained system. The eye’s drainage system works like a sink. If a blockage develops, or if fluid is produced faster than it can escape, an overflow will occur. In the eye, this overflow causes the pressure to elevate.
The second was intraocular pressure (IOP) – the higher the IOP the greater the risk for developing glaucoma. Fortunately, we can affect IOP by taking medications to lower it. The third risk factor is family history (genetics). Another risk factor is corneal thickness, the thickness of the clear outer surface of the eye.
The valve function of a glaucoma drainage device limits the flow of eye fluid in one direction, which puts a theoretical limit to how low the eye pressure can drop. However, in many patients, supplemental glaucoma medications such as eye drops are still required after an Ahmed valve is implanted to keep eye pressure within a normal range.
Current treatments for all glaucomas are focused on reducing eye pressure through medications, laser, or surgery. While eye pressure is a major risk factor for primary open-angle glaucoma, there is also a subtype of glaucoma in which eye pressure is not elevated, which some call “normal-tension glaucoma” or “low-tension glaucoma ...
Ocular hypertension is a condition in which the measured eye pressure (intraocular pressure or IOP) is consistently greater than “normal." However, there is no obvious damage to the optic nerve as detected by an eye examination, optic nerve imaging, or evidence of visual field change. In other words, there is no evidence of glaucoma yet.
Published on: December 12, 2023. This article summarizes some of the tests that you may experience during an eye exam for glaucoma, including the visual field test, corneal thickness and angle tests, optic nerve imaging, and the eye pressure check. Glaucoma is an umbrella term, which covers a group of diseases with a characteristic pattern of ...
The doctor will evaluate vision, the pupils, eye pressure, and corneal thickness, and examine the front and back of the eye. There is also an examination of the drainage “angle” or drainage system of the eye by using a special lens with mirrors, called gonioscopy. It is important to determine whether the drainage angle is open or closed.