Glaucoma vs Cataracts: Symptoms and Treatments

What Is Glaucoma?

Glaucoma is a group of eye diseases that damage the optic nerve, which is responsible for transmitting visual information from your eye to your brain. This damage is usually caused by abnormally high pressure inside the eye, known as intraocular pressure (IOP).

The most concerning aspect of glaucoma is that it often progresses slowly and without symptoms in its early stages. By the time you notice vision loss, significant and irreversible damage may have already occurred. This is why glaucoma is often called the “silent thief of sight.”

Types of Glaucoma

There are several types of glaucoma, but the two most common are:

• Open-angle glaucoma: The most common form, accounting for about 90% of cases. It develops gradually when the eye’s drainage system becomes less efficient over time, causing pressure to build up slowly.
• Angle-closure glaucoma: Less common but more serious, this occurs when the iris blocks the drainage angle in the eye, causing a sudden increase in eye pressure. This is a medical emergency that requires immediate treatment.

What Are Cataracts?

Cataracts are a clouding of the eye’s natural lens, which sits behind the iris and pupil. The lens is normally clear and helps focus light onto the retina at the back of the eye. When a cataract forms, the lens becomes cloudy or opaque, causing vision to become blurry, dim, or hazy.

Unlike glaucoma, cataracts don’t damage the optic nerve. Instead, they affect the clarity of the images reaching your retina. Think of it like looking through a foggy or frosted window. The “view” is still there, but it’s obscured by the cloudiness in front of it.

Cataracts are extremely common and are considered a natural part of aging. In fact, according to the National Eye Institute, by age 80, more than half of Americans either have a cataract or have had cataract surgery.

Glaucoma vs Cataracts: Key Differences

While both conditions can affect your vision as you age, glaucoma and cataracts are fundamentally different in how they develop, what they affect, and how they’re treated.

Glaucoma Symptoms

One of the most challenging aspects of glaucoma is that it often has no early warning signs, especially in open-angle glaucoma. Vision loss begins at the edges of your visual field (peripheral vision), which you may not notice until significant damage has occurred.

Early-stage Glaucoma Symptoms

• No symptoms at all (this is why regular eye exams are so important)
• Gradual loss of peripheral vision, often in both eyes
• Difficulty seeing in low light

Advanced Glaucoma Symptoms

• Tunnel vision (loss of peripheral vision on all sides)
• Blind spots in your central or peripheral vision
• Difficulty with tasks that require side vision, such as driving

Acute Angle-closure Glaucoma Symptoms

This is a medical emergency and requires immediate attention. Symptoms include:

• Severe eye pain
• Sudden blurred vision
• Halos around lights
• Redness in the eye
• Nausea and vomiting
• Sudden onset of visual disturbance

If you experience these symptoms, seek emergency care immediately.

Cataract Symptoms

Unlike glaucoma, cataracts typically cause noticeable changes to your vision as they develop. The symptoms are usually gradual but become increasingly disruptive over time.

• Blurry or cloudy vision, as if looking through a foggy window
• Difficulty seeing at night, especially while driving
• Sensitivity to light and glare, particularly from headlights, sunlight, or lamps
• Seeing halos around lights, especially at night
• Fading or yellowing of colors, making it harder to distinguish between shades
• Double vision in one eye (this is less common but can occur)
• Frequent changes in eyeglass or contact lens prescriptions, as your vision continues to deteriorate despite corrections

Cataracts usually affect both eyes, but they may develop at different rates, causing one eye to have worse vision than the other.

Can You Have Both Glaucoma and Cataracts?

Yes, it’s possible to have both glaucoma and cataracts at the same time, especially as you age. In fact, having one condition doesn’t make you immune to the other. Some patients even discover they have glaucoma during a pre-operative evaluation for cataract surgery.

If you have both conditions, your eye doctor will work with you to determine the best treatment approach. In some cases, cataract surgery can actually help lower eye pressure in patients with certain types of glaucoma, providing a dual benefit. 

Cataract Treatment Options

The only effective treatment for cataracts is surgery, but the good news is that cataract surgery is one of the most common and successful procedures performed in the United States.

When Is Cataract Surgery Necessary?

Not all cataracts require immediate surgery. In the early stages, you may be able to manage symptoms with:

• Updated eyeglass or contact lens prescriptions
• Brighter lighting for reading and other tasks
• Anti-glare sunglasses
• Magnifying lenses for close-up work

However, when cataracts begin to interfere with your daily activities, such as driving, reading, or working, surgery is the best option.

What Happens During Cataract Surgery?

Cataract surgery is a quick, outpatient procedure that typically takes less than 30 minutes. Here’s what happens:

1. Anesthesia: Your eye is numbed with drops or a local anesthetic.
2. Lens removal: The cloudy lens is broken up using ultrasound (phacoemulsification) and removed from the eye.
3. Lens replacement: A clear artificial lens, called an intraocular lens (IOL), is implanted in place of the natural lens.

Most patients notice improved vision within a few days, and full recovery takes a few weeks. Cataract surgery has a very high success rate, with most patients experiencing significantly improved vision and quality of life.

Types of Intraocular Lenses (IOLs)

There are several types of IOLs available, and your ophthalmologist will help you choose the best option based on your vision needs and lifestyle:

• Monofocal lenses: Provide clear vision at one distance (usually far), requiring reading glasses for close-up tasks
• Multifocal or accommodating lenses: Allow for clear vision at multiple distances, reducing dependence on glasses
• Toric lenses: Correct astigmatism in addition to cataracts

Expert Eye Care at Cascade Eye & Skin Centers

If you’re experiencing vision changes or are concerned about glaucoma or cataracts, the ophthalmology team at Cascade Eye & Skin Centers is here to help. We provide comprehensive eye exams, advanced diagnostic testing, and a full range of treatment options for both glaucoma and cataracts.

Serving patients throughout the South Sound, including Auburn, Bonney Lake, Gig Harbor, Puyallup, Sunrise, and University Place, we’re dedicated to helping you see clearly and live fully at every stage of life.

Schedule an eye exam today and take the first step toward protecting your vision.