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Millions of Americans suffer from glaucoma and cataracts. They can impair your vision and eventually lead to blindness.
While both lead to vision loss and blindness, cataracts and glaucoma are two distinct eye conditions. Each affects certain parts of the eye. They are also associated with different causes and symptoms.
Glaucoma is caused by optic nerve damage. It is triggered by high intraocular pressure (IOP) or increased pressure in the eye.
In a healthy eye, the lens projects light to the retina, which sends nerve impulses to the brain. Your visual cortex (located at the back of your brain) then interprets them as images.
These impulses travel via the optic nerve. Damage from ocular hypertension can lead to vision loss and blindness.
Your signs and symptoms will depend on the type of glaucoma and the severity of your condition.
There are two types of glaucoma:
It affects 4 million Americans, making it the most common type of glaucoma. Symptoms include:1
Open-angle glaucoma causes gradual vision loss that begins on the sides. Unfortunately, most people won't know they have it until they lose their central vision.
Also known as narrow-angle glaucoma or acute glaucoma, it is a rare form of glaucoma with the following symptoms:2
Angle-closure glaucoma causes noticeable symptoms that quickly develop. They can cause immediate damage to the optic nerve and lead to rapid vision loss.
A cataract is a cloudy formation that appears on your eye lens. In a healthy eye, the lens should be clear.
The eye lens consists of proteins that break down with old age. This causes cataracts to form on the surface of your lens.
Cataracts develop slowly and will not affect your eyesight early on. As it progresses, you may experience:
If you have a cataract, your color perception may change. Colors will appear faded or more yellow. You may also feel the need to use more light when reading or performing activities.
Glaucoma and cataracts are among the leading causes of blindness in elderly Americans.3
Glaucoma and cataracts are different eye disorders with some similarities and differences:
Here's what glaucoma and a cataract have in common:
Here are the differences between glaucoma and a cataract:
None of these conditions are worse than the other. Both glaucoma and cataracts lead to vision loss if left untreated.
For these reasons, we recommend that you visit an ophthalmologist as soon as you notice any vision changes.
The doctor can perform a routine eye exam to diagnose your condition. From there, they can help you explore treatments. If you happen to be in a medical emergency, they can provide immediate treatment.
Acute glaucoma is an ocular emergency. Without treatment, it can cause irreversible blindness.
Cataracts do not cause glaucoma. That said, they can increase your risk for elevated eye pressure and glaucoma.
Glaucoma also does not cause cataracts. But certain glaucoma surgeries can put you at risk of developing cataracts.
A cataract starts as a thin membrane that forms on the lens surface. As it worsens, it becomes cloudier and thicker.
Cataracts can push the iris back to the trabecular meshwork — a spongy tissue that drains the aqueous humor. If this gets blocked, it prevents any excess eye fluid from draining.
This causes pressure to build up inside your eye, leading to angle-closure glaucoma. In these cases, you can undergo cataract surgery to reduce any symptoms of glaucoma and treat your cataract. Though you may still need additional treatments to restore normal intraocular pressure.8
Doctors treat glaucoma by reducing eye pressure. Some treatment options include a surgery called trabeculectomy and fluid drainage devices like tube shunts.
Unfortunately, they can lead to cataract development.9
Even though they are completely different eye diseases, it's possible to have both conditions at the same.
Your eye doctor will likely recommend cataract surgery and combine it with glaucoma treatments such as:
Sometimes, cataract removal is enough to reduce eye pressure without glaucoma surgery.10
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