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Glaucoma
Glaucoma is called the “silent thief of sight” because it often shows no early symptoms. If not treated, it can cause permanent vision loss.
Glaucoma is a specific pattern of optic nerve damage and visual field loss caused by a number of different eye diseases that can affect the eye. Most, but not all of these diseases, are characterized by abnormally high pressure within the eye created by the fluid (aqueous fluid) in one or both eyes.
When this pressure (called the intraocular pressure) remains elevated over a period of time, damage occurs to the delicate optic nerve. Currently, damage from glaucoma cannot be reversed. If left untreated, blindness often results. Glaucoma usually affects both eyes. In Malaysia, some form of glaucoma affects about 1 in 2000 people.
Types of Glaucoma
1. Open-Angle Glaucoma (Most Common): Slow drainage of eye fluid increases eye pressure.
2. Angle-Closure Glaucoma: A sudden blockage of fluid drainage, leading to a rapid rise in eye pressure.
3. Congenital Glaucoma: Present at birth due to abnormal eye development.
4. Normal-Tension Glaucoma: Damage occurs despite normal eye pressure.
This disease causes `silent blindness´ because it strikes without obvious symptoms. Therefore, the person with glaucoma is usually unaware of it until serious loss of vision has occurred. In fact, half of those suffering damage from glaucoma do not know it.
Glaucoma is a leading cause of blindness in people over forty. Early detection and treatment of glaucoma are the only way to prevent visual impairment and blindness.
Are there different types of glaucoma?
Yes. There are 2 main types.1. Chronic glaucoma (chronic = slow) in which the eye pressure rises very slowly and there is no pain to show there is a problem, but the field of vision gradually becomes impaired.
2. Acute glaucoma (acute = sudden) is much more common in Asian eyes. This happens when there is a sudden and complete blockage to the flow of aqueous fluid in the eye. This can be quite painful and will cause permanent damage to vision if not treated promptly.
There are however other types of glaucoma that is beyond the scope of this discussion.
Who is at Risk?
There are a few predisposing factors related to this disease which tend to put some people at greater risk:- People over the age of 45
- People who have a family history of glaucoma
- People with abnormally high intraocular pressure (IOP)
- Diabetes
- Myopia (nearsightedness)
- Regular, long-term steroid/cortisone use
- A previous eye injury
How is chronic glaucoma detected?
In the early stages, a person will not experience any symptoms. The early visual changes are very slight, usually only affecting peripheral vision. The centre of the visual field is last affected, so that eventually it appears like the patient is looking through a long tube, in the late stages, the so-called 'tunnel vision'. In time even this sight would be lost.
It is therefore, important to have our eyes checked regularly, because early detection and treatment of glaucoma are the only way to prevent visual impairment and blindness. In Malaysia, screening tests for glaucoma is generally done by ophthalmologists (eye doctors). Please consult the chart below to determine how often you should visit your eye doctor for a comprehensive glaucoma examination.
| If You Have No Risk Factors For Glaucoma | If You Have Risk Factors for Glaucoma | |
| Under 45 years old | Every 4 years | Every 2 years |
| 45 years & older | Every 2 years | Every year |
A number of tests may be performed, which will help to determine whether or not you have glaucoma, or are especially likely to develop the disease -- even before you have any symptoms. These tests are:
- Measuring the pressure in the eye using a special instrument
- Viewing your optic nerve utilising a special instrument
- Perimetry is a computer assisted test that maps the field of vision
How is glaucoma treated?
Glaucoma can be treated with:
- Eye drops
- Pills
- Laser Surgery
- Eye Operations
- or a combination of methods
In acute glaucoma, pressure can usually be brought under control in a few hours with medication and surgery. Similar treatment to the other eye may be recommended to prevent an acute attack.
In chronic glaucoma, treatment is usually started with eye drops. The aim is to lower the pressure in the eye. Some eye drops also aim to improve the blood supply of the optic nerve. If this does not help, the surgeon may suggest either laser treatment or a surgery to improve the drainage of fluids from the eye and thus reduce the pressure.