What the eye test measures and why you need to pass it
The eye test for your driver's license is a vision screening, not an eye exam. The DMV tests whether you can see well enough to drive safely on public roads. You will read letters or numbers on a chart from a set distance — usually 20 feet — and the examiner records what you can and cannot see clearly.
Every state requires this test before issuing or renewing a license. You cannot skip it or take it at home. The test takes about two minutes and happens at the DMV counter or in a separate vision station before you move to the written knowledge test or road test.
The standard passing score is 20/40 vision in at least one eye, though some states require 20/30. That means you can read letters from 20 feet away that an average person can read from 40 feet away. If you wear glasses or contacts, you take the test while wearing them — and your license will be restricted to "corrective lenses required" if you do.
Key Takeaways
- You must achieve at least 20/40 vision (some states require 20/30) in at least one eye to pass the DMV vision test.
- If you wear glasses or contacts, bring them to the DMV and wear them during the test; your license will note the restriction.
- The test happens before your written knowledge test, so failing it means you cannot proceed that day.
- If you fail, most states let you retake it the same day or within a few days at no extra charge.
- A recent eye exam from an optometrist or ophthalmologist can sometimes substitute for the DMV vision test, depending on your state.
Bring your corrective lenses if you use them
If you wear glasses or contacts, wear them to the DMV. Do not try to pass the test without them if you normally use them to drive. The DMV is testing your actual driving vision, not your uncorrected vision.
Make sure your glasses are clean and your contacts are fresh. If your prescription changed recently, get new glasses or contacts before your appointment if possible. An outdated prescription can cause you to fail even if your current lenses would let you pass.
If you wear bifocals or progressive lenses, let the examiner know. Some vision tests require you to look through a specific part of the lens, and the examiner may adjust how you position yourself.
What happens during the test and common reasons for failure
You will stand or sit about 20 feet from a vision chart (usually a Snellen chart with rows of letters that get smaller toward the bottom). The examiner will ask you to read the smallest line you can see clearly. You read one eye at a time, starting with your right eye, then your left, then both together.
You fail if you cannot read the required line with at least one eye. The most common reason for failure is an outdated or incorrect prescription. The second most common reason is not wearing corrective lenses when you should be. A smaller number of people fail because they have a vision condition — such as cataracts, macular degeneration, or severe astigmatism — that cannot be corrected enough with lenses alone.
Some states also test your peripheral vision (side vision) and color blindness, though these are less common. If your state does, the examiner will tell you what to expect.
What to do if you fail the vision test
If you fail, ask the examiner what the next step is. Most states allow you to retake the test the same day at no charge. You get one or two attempts before you have to leave and come back another day.
If you fail twice, you will need to see an eye care professional — an optometrist or ophthalmologist — before you can try again. They will perform a full eye exam, write a report of your vision, and you will bring that report back to the DMV. Some states require the report to be on a specific form; ask the DMV which form your state uses.
Do not schedule your road test or written test until you have passed the vision test. Some DMV locations will not let you proceed to the next step if you fail vision screening.
Using an eye exam from your optometrist or ophthalmologist instead
Some states allow you to bring a recent eye exam report from your optometrist or ophthalmologist instead of taking the DMV vision test. This is not true in all states, so check your state DMV website first.
If your state allows it, the exam must be recent — usually within 60 days of your DMV visit — and must include your visual acuity (the 20/40 or 20/30 measurement). The report must be on the optometrist's or ophthalmologist's letterhead and signed by them. Some states require a specific form; ask your eye care provider whether they have the DMV form or whether you need to request it.
Bring the original report or a certified copy to the DMV. A photo or scan may not be accepted. If you use this route, you still cannot wear sunglasses or a hat that blocks the examiner's view of your eyes during your license photo.
State-by-state vision requirements and retesting rules
Vision requirements vary slightly by state. Most require 20/40 in at least one eye, but some states require 20/30. A few states test both eyes together and require a combined score. Check your state DMV website for the exact requirement before your appointment.
Retesting rules also vary. Some states let you retake the test when ready if you fail. Others require you to wait a few days or schedule a new appointment. Some charge a small fee for a retest; others do not. A few states require you to see an eye doctor before you can retake the DMV test at all.
If you are renewing your license by mail or online in a state that allows it, you may not need to retake the vision test if your previous test is still valid. Check whether your state honors vision tests from your last license renewal.
How to prepare so you pass on your first attempt
Get a current eye exam before your DMV appointment if your prescription might have changed. An eye exam costs between $100 and $300 depending on where you go, but it is cheaper than failing the DMV test and having to come back.
If you wear glasses, clean them the morning of your appointment. If you wear contacts, put in a fresh pair before you leave home. Avoid contact lenses that are old, torn, or uncomfortable — they can blur your vision enough to cause a failure.
Eat a normal breakfast and get enough sleep the night before. Vision can be affected by fatigue and low blood sugar. Arrive at the DMV with time to spare so you are not rushed or stressed during the test.
If you have a known vision condition — such as astigmatism, presbyopia, or early cataracts — talk to your eye doctor before your DMV appointment. They can tell you whether your current prescription is strong enough to pass the DMV test, or whether you need an updated one.
Frequently Asked Questions
Can I wear sunglasses during the vision test?
No. You cannot wear sunglasses, tinted glasses, or a hat during the vision test. The examiner needs to see your eyes clearly and watch how they move as you read the chart. You can wear regular glasses or contacts.
What if I fail the vision test but pass it at my eye doctor's office?
This can happen if the DMV chart is different from the one your eye doctor uses, or if you were nervous at the DMV. Bring your eye doctor's report to the DMV showing you passed their vision test. Most states will accept this as proof you meet the vision requirement.
Do I have to pass the vision test before I take the written knowledge test?
Yes. The vision test happens first, before you move to the written test or road test. If you fail vision, you cannot proceed that day. You will need to pass vision before scheduling or taking any other test.
What if I have one eye that is much worse than the other?
The DMV tests each eye separately and requires at least one eye to meet the standard (usually 20/40). If one eye is worse, the examiner will record that, but you can still pass if your better eye meets the requirement. Your license will not be restricted unless you fail both eyes.
How long is the vision test valid once I pass it?
The vision test is valid for the length of your license — usually four to eight years depending on your state and age. When you renew your license, you will take the vision test again. Some states allow you to renew by mail if your vision test is still current, but most require a new test at renewal.