What to expect from a comprehensive eye exam after 40

After 40, the eye changes faster than most people realise. Even if your vision feels stable, a comprehensive eye exam every one to two years catches conditions that are silent until they're advanced — glaucoma being the most important example. Here's what a thorough exam looks like and what each test is actually for.

Before you arrive

• Bring your current glasses and any contact-lens prescription.
• List your medications — several (steroids, some antihistamines, certain antidepressants) affect the eye.
• Note family history of glaucoma, macular degeneration, or diabetic eye disease.
• Allow two hours; dilated pupils blur near vision for 4–6 hours afterwards, so arrange transport if you drive.

The core tests

• **Visual acuity** — the familiar letter chart, each eye separately.
• **Refraction** — fine-tuning your glasses prescription.
• **Cover test and eye-movement check** — looks for muscle imbalance and squint.
• **Slit-lamp examination** — a microscope view of the front of the eye: cornea, iris, lens. Picks up cataract, dry-eye disease, and early conjunctival lesions.
• **Tonometry** — measures intraocular pressure. High pressure is the main modifiable risk factor for glaucoma.
• **Dilated fundus exam** — drops widen the pupil so the retina, macula, and optic nerve can be examined directly.

Tests worth asking about after 40

• **OCT (optical coherence tomography)** — a non-contact scan that maps the retinal layers and the optic nerve in micrometre detail. Essential for glaucoma monitoring and for catching early macular degeneration.
• **Visual field testing** — flags peripheral vision loss before you'd notice it yourself.
• **Fundus photography** — a baseline image for comparison year to year.

What "normal" looks like at this age

Some near-vision blurring (presbyopia) is universal from the mid-40s onwards and is corrected with reading glasses or progressives. Mild floaters that have been stable for years are usually benign. A sudden shower of new floaters, flashes of light, or a curtain in your vision is an emergency — go the same day.

Conditions the exam is screening for

• Glaucoma — gradual peripheral vision loss, irreversible if untreated.
• Cataract — clouding of the lens, eventually treated surgically.
• Age-related macular degeneration — affects central reading vision.
• Diabetic retinopathy — even in well-controlled diabetes. If you're newly diagnosed with diabetes, start with our type 2 diabetes guide.

If your exam flags anything that needs follow-up, our directory helps you find a board-certified ophthalmologist by city, with verified hospital affiliations.