Open-Angle vs. Angle-Closure Glaucoma: What You Need to Know

What Is Glaucoma?

Glaucoma is a group of eye diseases that damage the optic nerve. High eye pressure often causes this damage.

regular eye tests for glaucoma detection

Open-Angle Glaucoma

Open-angle glaucoma is the most common type. It develops slowly when the drainage angle stays open, but the trabecular meshwork becomes clogged. This leads to increased eye pressure. Many people don’t notice symptoms until vision loss occurs.

Regular eye exams are critical for early detection. Treatment includes eye drops, medications, or laser therapy to reduce pressure and prevent further damage.

Angle-Closure Glaucoma

Angle-closure glaucoma is a medical emergency. It happens when the iris blocks the drainage angle, causing a sudden pressure spike. Symptoms include severe eye pain, nausea, redness, and sudden vision changes.

Immediate treatment is vital. Options include laser iridotomy or surgery to prevent permanent vision loss.

Key Differences

Open-angle glaucoma is linked to aging or genetics. Angle-closure glaucoma is more common in farsighted individuals or those with a family history.

When to Seek Help

Recognizing these differences helps you seek timely care. If you experience sudden vision changes or eye pain, consult an eye specialist immediately to protect your vision.


If you are unsure whether your symptoms require emergency attention, it is always safer to contact your healthcare provider or eye clinic for guidance.

At The Eye Center – Dr. Mahnaz Naveed Shah & Associates in Karachi, patients benefit from the care of internationally trained specialists across every sub-specialty of ophthalmology. Led by Dr. Mahnaz Naveed Shah, a highly experienced and dedicated glaucoma specialist with extensive training in advanced eye care, the team provides trusted support for both routine check-ups and urgent eye conditions. They will guide you on whether you need a screening, further investigation, or immediate treatment, always with your safety and comfort in mind. For expert consultation, contact 0304-111-9544 to book an appointment.

With a strong record of excellence in glaucoma and cataract care, Dr. Mahnaz Shah and her team remain committed to helping you protect your vision—with confidence.