Stoney Creek Eye Care & Eyewear Boutique - Dr. L Bahoshy & Assoc.
15 Mountain Ave S #110 Stoney Creek ON L8G 2V6 (905) 662-8863

(289) 205-2338

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Stoney Creek, ON
(905) 662-8863

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What is Optical Coherence Tomography (OCT)?

You may have heard your optometrist recommend OCT imaging during your eye exam, but what is it really? OCT is a powerful tool your optometrist uses to monitor your eye health and diagnose eye disease

3D Digital Eye Exams

Optical coherence tomography, or OCT for short, is sometimes referred to as a “3D” or “digital” eye exam. That’s because OCT involves taking 3D, digital images of your eye. Specifically, OCT takes a cross-sectional image of your retina, the light-sensitive part of your eye. 

Diagram explaining how OCT shows the retina in the eye

How Does OCT Work?

OCT works similarly to an ultrasound. It provides real-time images of your eye’s internal structures like an ultrasound, but OCT uses light waves instead of sound waves. These light waves illuminate and scan your retina, giving your optometrist a detailed view. So detailed, that your optometrist can evaluate your retina at a near-cellular resolution. 

What to Expect During an OCT Exam

From start to finish, an OCT exam takes about 10 minutes. The exam is non-invasive and painless. You simply place your chin into a chin rest and keep your eye open as you look at a target (often a blinking dot or a small picture). Then, without touching it, the OCT machine scans your eye. 


Depending on your risk level or history of eye disease, your optometrist might recommend that your eyes are dilated during the OCT exam. Dilating your eyes is a simple procedure and gives your optometrist an even larger view of your retina.

If you’re undergoing dilation, your optometrist will put eye drops into your eyes that cause your pupils to expand, or dilate. Most patients find dilation painless, although some light sensitivity is to be expected. You’ll still be able to drive yourself home from the exam, but make sure you bring a pair of sunglasses to help with the light sensitivity.

Benefits of OCT Testing


OCT testing gives your optometrist an in-depth look into your eyes without feeling in-depth. The process is quick and painless, with nothing touching your actual eye. It’s no more hassle than getting a school photo done, except in the case of OCT, the photo is of your retina. 

Early Disease Diagnosis

OCT is a great tool in diagnosing eye disease. In some cases, OCT can help your optometrist diagnose eye disease earlier, which allows for more effective treatment. Because OCT images give your optometrist such a detailed view of your retina, they can detect small indications of eye disease.

In addition to early disease diagnosis, OCT can also help with:

Do I Need an OCT Exam?

Your optometrist will likely recommend an OCT exam if you have an increased risk of eye disease. You probably have an increased risk if you are over age 50 or have:

  • A personal history of certain eye conditions
  • A family history of eye disease
  • Diabetes
  • High blood pressure (hypertension)

Even if you don’t have a high risk of eye disease, OCT exams are still a great way to help protect your eye health. By having OCT exams regularly, it creates a baseline that your optometrist can reference. Using this baseline, your optometrist can detect the smallest changes to your eyes over time. 

A normal, healthy macular OCT image

What Diseases Can OCT Help Diagnose?

Age-Related Macular Degeneration

Age-related macular degeneration (AMD) is one disease OCT can help diagnose, often earlier than other methods. AMD affects the macula, which is the central part of the retina. 

Wet age-related macular degeneration OCT image

OCT provides detailed images of the retina and macula, showing irregularities caused by AMD. With OCT imaging, your optometrist can detect signs of AMD like drusen (tiny clumps of protein) caused by dry AMD and abnormal blood vessels and bleeding caused by wet AMD.

Advanced dry age-related macular degeneration OCT image


In addition to producing detailed images of the retina, OCT can also show the optic nerve, which is the part of the eye affected by glaucoma. OCT can help with diagnosing glaucoma by showing damage and changes to the optic nerve. 

In particular, OCT can help diagnose forms of glaucoma that don’t cause increased intraocular pressure and therefore, can’t be diagnosed with standard glaucoma tests. 

Diabetic Retinopathy

Diabetic retinopathy causes damage to the retina, specifically to the blood vessels. OCT imaging shows these damaged or abnormal blood vessels, allowing for diagnosis.  

Diabetic retinopathy with diabetic macular edema OCT image
Diabetic retinopathy with an epiretinal membrane OCT image

Other Problems in the Retina & Macula

Because OCT gives such detailed images of the retina and macula, it can help diagnose a variety of other conditions, including:

Central serous retinopathy OCT image

OCT provides your optometrist with a wealth of information about your eye health. Whether you’re at risk for eye disease or simply having a routine eye exam, OCT images are a valuable tool that provide valuable insight. 

Written by Dr. Louis P. Bahoshy

Dr. Bahoshy attended the University of Waterloo, where he graduated with an Honours Bachelor of Science Degree (B.Sc), as well as a Doctor of Optometry (OD) Degree.

As part of his optometry training, Dr. Bahoshy completed an externship at the prestigious Omni Eye Institute in Baltimore, gaining extensive experience in diagnosing and managing ocular health conditions. He worked alongside a pediatric ophthalmologist at their satellite location in White Marsh.

While in optometry school, Dr. Bahoshy spent two summers as a researcher at the world-renowned Centre for Contact Lens Research (CCLR) at the University of Waterloo, School of Optometry, learning about the latest in contact lens technology.

Dr. Bahoshy began practicing at Stoney Creek Eye Care (formerly known as Dueck Optometry) in 2001. In October 2017, Dr. Bahoshy became the clinic’s new owner, continuing the commitment of serving Stoney Creek and the surrounding community.

Today, Dr. Bahoshy is an active member of the Ontario Association of Optometrists (OAO), the Canadian Association of Optometrists (CAO), and the Hamilton and District Society of Optometrists. He is also an affiliate doctor at TLC Laser Eye Centres.

When not seeing patients, Dr. Bahoshy enjoys swimming, going to the gym, and spending time with his wife Cynthia, and their two young boys, Pierre and Leo.

More Articles by Dr. Louis P. Bahoshy

Our Vision in Action

At Stoney Creek Eye Care & Eyewear Boutique our trusted team of eye doctors is committed to providing you with high-quality eye care, stylish frames, and personalized attention. We offer a wide variety of services, including:

Convenient Location, Extended Hours,
and Direct Billing

We understand that life is hectic. We want to help make it a little simpler, which is why our centrally-located practice offers extended hours on Saturdays. We’re also happy to directly bill most major insurance companies on your behalf. And on top of all that? We’ve got plenty of free parking. Stoney Creek Eye Care & Eyewear Boutique will always do whatever we can to make your life a little easier, located in the Health Science Building.

Stoney Creek Eye Care & Eyewear Boutique

  • 15 Mountain Ave S #110
  • Stoney Creek, ON L8G 2V6

Contact Information

Clinic Hours

  • Monday9:00 AM - 6:00 PM
  • Tuesday9:00 AM - 6:00 PM
  • Wednesday9:00 AM - 6:00 PM
  • Thursday9:00 AM - 6:00 PM
  • Friday10:00 AM - 5:00 PM
  • Saturday8:00 AM - 1:00 PM
  • SundayClosed

Eyeglass Frames & Lenses

A truly complete eye care experience includes the best eyewear the world has to offer. Our Boutique is well-stocked with globally-recognized brands like Dior, Ray-Ban, Kate Spade, Fossil, and much more.

But of course, your eyewear is much more than just your frames. We offer Zeiss lenses; the paragon of quality lens technology. By pairing the best in optical lenses with filters and coatings for improved performance, Stoney Creek Eye Care & Eyewear Boutique is here to help you look your best, see your best, and feel your best.

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