About the Glaucoma Clinic

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​​​​​​​​​​​Toronto Western Hospital | map iconMaps & Directions
East Wing 6th Floor​​

Hours & Contact

​​​Monday– Friday
9:00 am ​– 4:00 pm

Appointments with Dr. Graham Trope
Phone: 416 603 5317

Appointments with Dr. Yvonne Buys
Phone: 416 603 5682

What We Do

​Glaucoma gradually steals your peripheral vision through damage to the optic nerve. There's no pain or other symptoms, and most patients don't even know they have the disease until they've lost a significant part of their vision.

Glaucoma is one of the leading causes of blindness around the world. There's no cure and once the damage is done, it can't be reversed – but there are medications that can slow down its progress.  Ophthalmologists can detect and treat glaucoma before most patients experience any vision loss, which is why it's so crucial that people over 40 have their eyes checked regularly.

Our Glaucoma Clinic is part of the Donald K. Johnson Eye Centre. We treat more than 5,000 patients a year with the latest technology in optic nerve imaging and visual fields. We have special expertise in laser treatments and surgical techniques, including the use of glaucoma drainage devices such as the Ahmed Glaucoma Valve.

 The Inspiration behind the Donald K. Johnson Eye Centre

Toronto Western Hospital celebrated a major milestone in November 2007, with the announcement of a $5 million gift from Board Member and Vision Champion Donald K. Johnson. For almost 20 years, Don has been part of an effort to create a world-leading vision institute in Canada. He soon learned that the best place for that was right here at Toronto Western Hospital. "The Vision Program at TWH has the critical combination of a large patient base, outstanding clinicians and a comprehensive research program," says Don. "It has the potential to become the top eye disease centre in North America."

To support the Donald K. Johnson Eye Centre, please visit TGWH Foundation​

 Types of Glaucoma

​Primary open-angle glaucoma

This is a common type that gradually reduces your peripheral vision without other symptoms. By the time you notice it, permanent damage has already occurred.


​Angle-closure glaucoma

This produces sudden symptoms, such as eye pain, headaches, halos around lights, dilated pupils, vision loss, red eyes, nausea and vomiting.


Normal-tension glaucoma

This type can cause visual field loss due to optic nerve damage.


Pigmentary glaucoma

This is a rare form caused by clogging of the drainage angle of the eye thanks to pigment that has broken loose from the ir​​is, cutting down the fluid outflow from the eye.


Secondary glaucoma

After ​an eye injury, symptoms may show this form of the disease, which can also develop with the presence of eye infection, inflammation, a tumour or e​nlargement of the lens due to a cataract.


Congenital glaucoma

This is an inherited form present at birth. Most cases are diagnosed by age one. 

 Treatment for Glaucoma

​​​Most cases of glaucoma can be controlled with one or more drugs. But some people may require surgery to reduce their intraocular pressure (fluid pressure in the eye) further to a safe level by improving the outflow or drainage of fluids.

Surgery can occasionally eliminate the need for glaucoma eye drops, but you may need to continue with eye drops even after having glaucoma surgery.​

 Health Information

Visit our health information section.