What to Expect at Your Eye Test Appointment

What happens during an eye test

An eye test — also called a comprehensive eye exam or vision screening — is a series of tests that measure how well you see and check the health of your eyes. The appointment usually lasts 30 to 60 minutes, depending on whether you need dilated pupils (where the eye doctor puts drops in your eyes to open them wider for a better view of the back of your eye).

You'll sit in a chair facing different machines and answer questions about your vision, medical history, and any eye problems you've had. The eye doctor will test your vision using a chart with letters that get smaller, check how your eyes move together, measure the pressure inside your eyes, and look at the structures at the front and back of your eye. If dilation is part of your exam, your vision will be blurry for a few hours afterward, so plan for that if you're driving.

Key Takeaways

• Bring your insurance card, photo ID, and a list of any medications you take, because some drugs affect eye health and pressure.
• Arrive 10 to 15 minutes early to fill out a health history form, which asks about your medical conditions, family eye history, and current symptoms.
• If your eyes will be dilated, your pupils will stay enlarged for 3 to 5 hours, making bright light uncomfortable and reading difficult — wear sunglasses or bring them with you.
• The eye doctor will discuss your results before you leave and may write a prescription for glasses or contact lenses if you need one.
• If you wear contacts, you may be asked to remove them before certain tests, so plan to bring a case or wear glasses that day instead.

What to bring and how to prepare

Bring your current insurance card and a photo ID. If you have vision insurance separate from your medical insurance, bring both cards. The office will need to verify coverage before your appointment, and having the card there speeds up check-in.

Write down any medications you take — including over-the-counter drugs, supplements, and eye drops — and bring the list with you. Some medications affect eye pressure, tear production, or how your eyes focus, and the eye doctor needs to know what you're on. If you wear glasses or contacts, bring them to the appointment so the doctor can check your current prescription.

If you wear contact lenses, remove them before you arrive or plan to remove them at the office. Some tests are more accurate without contacts in, and the eye doctor may want to examine your cornea. Wear glasses instead if you have them, or plan to sit in the waiting room for a few minutes while your eyes adjust.

The vision and pressure tests

The eye doctor will start by testing how clearly you see. You'll look at a chart across the room — usually the familiar one with a big E at the top and smaller letters below — and read the smallest line you can see. This is your visual acuity. The doctor may use a machine called a phoropter, which has different lenses, and ask "Is this better, or is this better?" as they flip lenses in front of your eyes. This helps them find the right prescription if you need glasses or contacts.

Next, the doctor will measure the pressure inside your eyes using a test called tonometry. You'll rest your chin on a small support, and a machine will gently touch the front of your eye — or a puff of air will blow across it — to measure pressure. High eye pressure can indicate glaucoma, a serious eye condition. This test is painless, though the puff of air can be startling the first time.

The doctor will also check how well your eyes work together and how they move. You'll follow a small light or object as it moves across your field of vision. This test shows whether your eye muscles are balanced and whether you have any problems with eye alignment.

Dilation and the back of your eye

If your exam includes dilation, the eye doctor will put numbing drops in your eyes first, then dilating drops. The numbing drops sting slightly for a few seconds. The dilating drops take 20 to 30 minutes to work fully, so you may wait in the reception area while they take effect. During this time, your pupils will open wider, letting more light into your eye so the doctor can see the retina, optic nerve, and blood vessels at the back.

Once your eyes are dilated, the doctor will use a special light and magnifying lens to examine the back of your eye. This part is painless. You may see bright flashes of light, which is normal. The doctor is looking for signs of disease, damage, or other problems that aren't visible without dilation.

After dilation, your vision will be blurry and your eyes will be sensitive to light for 3 to 5 hours. Wear sunglasses on the way home, avoid driving if possible, and don't plan to read or do detailed work right after the appointment. Your pupils will return to normal size on their own — no drops are needed to reverse the effect.

Understanding your results and prescription

Before you leave, the eye doctor will discuss what they found. They'll tell you whether your vision is normal, whether you need glasses or contacts, and whether there are any eye health concerns. If you need a new prescription, they'll write it down for you. This prescription is yours to keep and use at any glasses or contact lens retailer — you're not required to buy from the eye doctor's office.

The prescription will include numbers for each eye: sphere (the main focusing power), cylinder (for astigmatism if you have it), and axis (the angle of astigmatism). It will also include your pupillary distance, or PD — the distance between your pupils — which you'll need if you order glasses online. If you don't see the PD on your prescription, ask the office for it.

If the doctor found any problems — such as early signs of glaucoma, cataracts, macular degeneration, or diabetic eye disease — they'll explain what it means and what the next steps are. Some conditions need follow-up appointments or treatment. Others just need monitoring at your next regular exam.

When to schedule your next appointment

How often you need an eye test depends on your age, eye health, and whether you have any conditions. Adults with no eye problems and no family history of eye disease typically need an exam every one to two years. If you have diabetes, glaucoma, or another eye condition, or if you're over 60, you may need exams every year or more often. The eye doctor will tell you when to come back.

If you notice vision changes, eye pain, flashes of light, or a sudden increase in floaters (small spots that drift across your vision) between appointments, contact your eye doctor right away. These can be signs of a serious problem that needs prompt attention.

Frequently Asked Questions

Do I need to fast or prepare in any special way before an eye test?

No fasting is required. You can eat and drink normally. If your eyes will be dilated, avoid driving afterward, so arrange a ride or plan to take public transit home. Otherwise, there's no special preparation beyond bringing your insurance card and medication list.

Will the eye test hurt?

No. The tests are painless, though some people find the puff of air in the tonometry test startling. Dilating drops may sting for a few seconds when they go in, but that passes quickly. If you have very sensitive eyes, tell the staff before the exam starts.

What if I can't see the letters on the vision chart?

That's exactly what the eye doctor is there to find out. The chart is designed to show what you can and can't see. The doctor will use the phoropter to find lenses that help you see more clearly, and they'll determine whether you need glasses or contacts.

Can I wear my contacts during the eye test?

You can, but the doctor may ask you to remove them for certain tests, especially if they're checking your cornea or measuring your eye's shape. It's easier to remove them before you arrive. If you don't have glasses, let the office know when you schedule so they can plan the appointment timing.

How long does it take to get glasses or contacts after my appointment?

If you order from the eye doctor's office, glasses usually take 1 to 2 weeks. Contact lenses may be ready the same day or within a few days. If you order online from another retailer, timing depends on the company. Ask the office how long their typical turnaround is when you pick up your prescription.