Retinal Imaging, OCT, and Eye Health Testing

Imaging & eye health: why people like it

Many people assume an eye exam is mainly about glasses.

But the part most patients find reassuring is seeing and understanding what’s happening with eye health — especially when images can be compared over time.

What is retinal imaging?

Retinal imaging captures a view of the back of the eye, where the retina and optic nerve live.

It can be useful for:

• documenting baseline eye health
• supporting assessment when there are symptoms
• tracking subtle changes over time

What is OCT?

OCT is a scan that can provide cross-sectional views of retinal layers and the optic nerve area.

It’s commonly considered when:

• there are specific findings that need closer assessment
• you have risk factors where tracking detail matters
• your optometrist needs a clearer baseline for future comparison

Why imaging matters

The reason imaging is worth doing comes down to timing. Many of the conditions that threaten sight — glaucoma, diabetic retinopathy, macular degeneration — cause no symptoms in their early stages. By the time you notice a change in your vision, damage has often already happened, and some of it cannot be reversed.

Imaging lets your optometrist see structural change directly, often years before you would notice anything:

• Retinal photography documents a detailed baseline of the back of the eye, so the smallest new change stands out when it is compared at your next exam.
• OCT looks beneath the surface at the individual retinal layers and the optic nerve, where early glaucoma thinning or fluid from diabetic or macular disease shows up first — before it reaches the part of your vision you would feel.

Catching these changes early is what keeps them treatable. That is the value the images add: not just a picture, but the chance to act while acting still makes a difference.

Do I always need imaging?

No.

The right question is:

• what is recommended for my case today?
• what is optional, and what value does it add?

A good exam makes this clear.

Will you show me the images?

You should expect:

• to see the images (when taken)
• a plain-language explanation of what’s normal vs what’s being watched
• guidance on what changes would matter in future exams

What about meibography?

Meibography is a separate type of imaging used for dry eye assessment — specifically to evaluate the meibomian glands (oil glands) in the eyelids.

It uses infrared light to photograph gland structure and can show atrophy or dropout that is not visible from symptoms alone. It is not part of a routine eye exam but is offered when there is clinical reason to assess meibomian gland health more closely.

See What is meibography and does Spadina Optometry offer it? for a full explanation.

Related pages

• Floaters and flashes – when to worry – why imaging and OCT matter for floater patients
• What is meibography and does Spadina Optometry offer it?
• What is the best eye exam in Toronto?
• What is myopia and how is it managed?
• Does screen time cause myopia?