Define narrow angle glaucoma?

Narrow angle highiop. Narrow angle glaucoma is a condition where the eye pressure is elevated due to mechanical blockage of the trabecular meshwork by the peripheral iris.
Fluid obstruction. Narrow angle glaucoma is the condition in which the lens and iris are too far forward in the eye, and when pupillary dilation occurs some of these will have obstruction of the fluid outflow tract (meshwork) causing a dangerous elevation of the eye pressure (narrow angle glaucoma or acute glaucoma) which is a medical emergency.
A type of glaucoma. Typically, a shorter eye or anteriorly rotated ciliary body with a lens that is taking up room in the anterior chamber causing a narrow spacing from the iris to the trabecular meshwork drain of the eye. There is a spectrum of open, narrow and closed.

Related Questions

What is narrow-angle glaucoma?

Eye anatomy problem. The cornea of the eye comes down like a dome over the iris. Where the two meet is called the angle, and this is where fluid drains from the eye internally. In narrow-angle glaucoma, there is very little space between the cornea and the iris at the angle, and the drainage channels become physically blocked by the iris. This causes increased eye pressure, which then can lead to optic nerve damage. Read more...
Anatomical Proble. Angle closure glaucoma is far less common than open angle glaucoma. The pathology is based on an anatomical narrowing of the drainage site where fluid made inside the eye drains out. Think plumbing: a clogged drain backs up, and in the eye the pressure increases dramatically. Very painful and vision can be lost entirely in a few hours. High risk patients should be treated, but only if high risk. Read more...

Narrow angle glaucoma---who gets it? What is that?

Serious eye problem. Angle closure is when the outflow of aqueous humor is completely blocked and the eye pressure builds up to dangerous levels potentially causing blindness sometimes within 24 hours. It is more common in asian and native american populations particularly in alaskan eskimos. Read more...
Narrow angles. Narrow angle glaucoma is more common in persons of asian or inuit descent, females, those with family history of narrow angles or narrow angle glaucoma, far-sighted individuals, and older patients. It causes closure of the fluid drainage system of the eye and high pressures in the eyes which can cause optic nerve damage and loss of vision if not treated. Read more...

Can you tell me what is the difference between narrow-angle glaucoma and closed-angle glaucoma?

Yes. Narrow angle glaucoma means the drainage system in the eye is blocked off by internal eye structures and can result in acute dramatic pressure rises. Open angle means the drainage system is grossly open but the fine meshwork has too much resistance. This is a slow process. Read more...
Spectrum. A narrow angle vs. A closed angle is a spectrum from partially closed to completely closed as seen on gonioscopy or other angle imaging methods. A closed angle often has scarring, though it can be appositionally closed and thus still able to open. The angle status affects treatment of glaucoma, and sometimes narrow angle configuration is a precursor or risk factor for developing glaucoma. Read more...

Why should Valium not be used if I have narrow angle glaucoma?

Valium can be used. I am not aware of any connection between glaucoma and the use of valium. Read more...
Pressure can rise. Valium is in a class of drugs that the fda has listed as a contraindication because of a potential further reduction in the angle of the eye responsible for passage of the eye fluid. If that angle is already narrow, any further narrowing may result in blockage of fluid flow causing the eye pressure to build up and cause redness, pain, and glaucoma damage to the eye nerve, which can be permanent. Read more...

Why shouldnt Valium be used if you have narrow angle glaucoma?

Could cause pressure. Valium is a muscle relaxant which selectively affects skeletal muscle fibers more than smooth muscle fibers found in the iris and pupil. The thinking would be that if valium or diazepam relaxes the iris muscles it could trigger angle closure glaucoma -a medical emergency. I've never seen that happen to a patient on valium and if you have a laser iridotomy it will prevent this. Read more...

How is it that Valium should not be used if you have narrow angle glaucoma?

It depends. Valium belongs in a class of medications that, in theory, could precipitate an angle closure attack (as a weak anticholinergic). In practice, this is not an absolute contraindication. What is more important is to ensure that your narrow angles are managed by your ophthalmologist (either with laser+/-medication). Read more...