Have you ever skipped your annual eye exam because your vision seemed perfectly fine? You are not alone. It is one of the most common reasons people delay booking an appointment. Life gets busy, and if nothing seems wrong, why bother?
But here is the thing: your eyes can be telling a very different story.
Early in my career, I had a patient who made this exact assumption. He was a healthy young man, seeing 20/20 in both eyes, with no complaints whatsoever. During routine visual field testing, however, we found that both sides of his peripheral vision were completely absent. He had no idea. His brain had been quietly compensating, filling in the gaps using information from the other eye.
When we completed his comprehensive eye exam, we identified signs of papilledema, which is swelling of the optic nerves. We referred him immediately for neuroimaging, which led to the diagnosis of a pituitary gland tumour. Because it was caught early, he was able to have successful surgery with no ongoing symptoms or recurrence.
While this is a rare case, it highlights an important point: eye exams can reveal serious underlying health conditions long before symptoms appear.
Your Eyes Are a Window Into Your Overall Health
Your eyes are one of the only places in the body where blood vessels, nerves, and connective tissue can be observed directly, without any invasive testing.
That makes a comprehensive eye exam one of the most valuable preventive health tools available.
Your optometrist is not only checking whether you need a new glasses prescription.
They are examining the health of your retina, optic nerve, and the structures throughout your eye for early signs of both ocular and systemic disease.
What a Comprehensive Eye Exam Can Detect
Even when vision feels completely normal, a full eye health assessment can uncover early signs of conditions affecting both your eyes and your general health. These include:
Diabetes
Changes in the retina are sometimes visible before a formal diabetes diagnosis is made.
High Blood Pressure
Hypertension can affect the blood vessels at the back of the eye, often with no symptoms.
Glaucoma
Often called the silent thief of sight, this condition can progress significantly before you notice any vision loss.
Macular Degeneration
Age-related changes to central vision are far easier to manage when detected early.
Neurological Conditions
Changes in the optic nerve or visual field can point to issues along the entire visual pathway.
Autoimmune Conditions
Some systemic diseases first appear as changes in or around the eye.
None of these conditions necessarily cause pain or obvious vision changes in their early stages. That is exactly what makes regular eye exams so important.
Waiting for symptoms is often waiting too long.
Why "Seeing Fine" Is Not the Whole Picture
Reading an eye chart measures one thing: your visual acuity. But a comprehensive eye exam evaluates much more.
During a full assessment, your optometrist will examine:
- Eye pressure (intraocular pressure), which is relevant to glaucoma risk
- Retinal health, including the blood vessels, macula, and optic disc
- Optic nerve appearance, which can reflect neurological and systemic health
- Visual field function, including peripheral vision
- Anterior segment health, including the cornea, lens, and iris
- Binocular vision and eye coordination
It is entirely possible to see clearly at 20/20 while early-stage disease is developing in the background. That is why a pharmacy kiosk vision test or an online check is not a substitute for a proper clinical exam.
Prevention Is the Goal
Routine eye care is not just about updating your prescription. It is about detecting change early, monitoring over time, and protecting your vision for decades to come. Many of the conditions that lead to permanent vision loss are far more manageable when caught before symptoms appear.
At Mission Eye Care, our team of optometrists uses advanced diagnostic technology to give you a complete picture of your eye health at every visit. We have been serving Calgary patients for over 20 years, and what we find at a routine exam can genuinely change outcomes.
When Should You Have an Eye Exam?
For adults between 19-65 years old, a comprehensive eye exam is recommended every one to two years. Annual visits are recommended if you have a family history of glaucoma, macular degeneration, or diabetes, or if you wear contact lenses.
Children under the age of 19 should be assessed annually, especially as undetected problems can affect classroom learning. Alberta Health offers coverage towards eye exams for Albertans under 19 and over 65 years old. For adults between 19 and 64, coverage depends on your extended health benefits. Our team can help you understand your coverage before your visit.
Watch: Why Eye Exams Matter More Than You Think
Check out Mission Eye Care’s very own, Dr. Sheila Morrison, who was recently on the news discussing the importance of Senior Eye Exams for the early detection of eye diseases. These diseases can include diabetes, high blood pressure, cataracts, glaucoma and macular degeneration.
Your Take-Home Message
Even if your vision feels perfect, a comprehensive eye exam is still one of the most worthwhile health appointments you can book. It takes less than an hour and can catch conditions that have no warning signs.
If it has been more than a year since your last exam, or if you have never had a full assessment, now is a good time to schedule one.
Dr. Andrea Lasby Optometrist (FAAO, FSLS, FCCSO)
Dr. Lasby is a private practice clinician and partner at Mission Eye Care in Calgary. She is residency trained in corneal disease and custom contact lenses. She is also a well-renowned speaker and serves on the board of the Alberta Association of Optometrists.
Frequently Asked Questions About Eye Exams
For most healthy adults, every one to two years is the standard recommendation. If you have risk factors such as a family history of glaucoma or macular degeneration, diabetes, or you wear contact lenses, annual exams are generally advised. Your optometrist will recommend a schedule based on your individual health history.
Alberta Health covers annual eye exams for children under 19 and adults 65 and older. Adults between 19 and 64 are not covered under the provincial plan but may have coverage through extended health benefits. Our front desk team is happy to help you figure out what your plan includes before your visit.
Yes. Because the blood vessels and nerves in your eyes can be viewed directly, an eye exam can reveal early signs of systemic conditions including diabetes, hypertension, and some neurological conditions, sometimes before other symptoms are present. Your optometrist will refer you to your family physician if anything concerning is found.
A vision test, like reading an eye chart, only checks your visual acuity. A comprehensive eye exam includes an assessment of eye pressure, retinal health, optic nerve appearance, peripheral vision, and the health of all eye structures. It is a full clinical evaluation, not just a prescription check.
Your visit will typically include a review of your health history, visual acuity testing, an assessment of your eye pressure, a retinal and optic nerve evaluation, and a review of your visual field. Depending on your age and health history, dilation may be recommended to allow a more thorough view of the back of the eye. Most appointments take approximately 45 to 60 minutes.
Yes. Many serious eye conditions, including glaucoma and early macular degeneration, develop without any noticeable symptoms. By the time vision changes appear, significant damage may already have occurred. Regular exams allow problems to be caught and managed early, which leads to much better outcomes.
