What the vision test measures and why it matters

The vision test at the DMV checks whether you can see well enough to drive safely. It is not a full eye exam — the DMV does not diagnose eye disease or prescribe glasses. Instead, it measures visual acuity (how clearly you see) and sometimes peripheral vision (what you can see to the sides without moving your eyes).

Most states use a standard acuity test: you read letters on a chart from a set distance, usually 20 feet away. The examiner records what you can read clearly. If you cannot meet your state's minimum standard — typically 20/40 or 20/50 vision in at least one eye — you will not pass and cannot be issued a license until you retest or provide proof of correction.

Some states also test color vision, because distinguishing red from green traffic lights matters for safety. A few states check eye tracking or the ability to follow moving objects. The specific test your state uses depends on state law, not on the DMV office you visit.

Key Takeaways

  • The DMV vision test measures how clearly you see letters on a chart from 20 feet away, and your state sets the minimum passing score — usually 20/40 or 20/50 vision.
  • You can wear glasses or contact lenses during the test if you normally wear them while driving, and the examiner will note this on your license.
  • If you fail, you can retake the test the same day in most states, and you do not need a new appointment or fee.
  • Some states require an eye doctor's report if you fail twice or have certain eye conditions, but a failed DMV test alone does not require a doctor's visit.
  • Bring your current glasses or contacts to your appointment even if you do not always wear them, because you can choose whether to use them during the test.

How to prepare for the vision test

If you wear glasses or contact lenses, bring them with you to your DMV appointment. You do not have to wear them during the test, but you can choose to — and the examiner will mark your license to show whether you passed with or without correction. If your license says "corrective lenses required," you must wear them every time you drive, and driving without them is a violation.

If you wear bifocals or progressive lenses, tell the examiner before the test starts. Some DMV offices have you stand at a specific distance or angle to read the chart, and bifocals can affect what you see depending on where you look. The examiner can adjust the test or let you position yourself differently.

Do not try to memorize the eye chart. DMV examiners use different charts or cover parts of the chart between tests, and memorizing one version will not help you pass if you cannot actually see the letters. If you are worried you might not pass, see an eye doctor before your appointment — that way you will know whether you need glasses and can get them in time.

What happens if you fail the vision test

If you do not meet your state's minimum vision standard, you will not pass. The examiner will tell you the result and usually offer you a chance to retake the test when ready, at no extra charge. You do not need a new appointment or a new fee. Many people pass on the second try because they know what to expect or because they put on glasses the second time.

If you fail twice in the same visit, most states will not let you test again that day. You will have to schedule another appointment, usually at least a few days later. Some states require you to bring a letter from an eye doctor after two failures, confirming that you can see well enough to drive safely with or without correction.

A failed DMV vision test does not automatically require you to see an eye doctor. However, if you fail and you do not wear glasses, it is a good idea to get an eye exam. You may have a vision problem you did not know about, and an eye doctor can prescribe correction if you need it.

State differences in vision test standards

Every state sets its own minimum vision standard, and these vary. Most states require 20/40 vision in at least one eye, meaning you can read letters from 20 feet away that a person with perfect vision could read from 40 feet away. Some states allow 20/50 or even 20/60 in one eye if the other eye is better. A few states have higher standards — 20/30 or better — especially for commercial driver licenses.

Some states test both eyes separately and require a minimum in each eye. Others test both eyes together and only require the combined result to meet the standard. If you have vision in only one eye, most states will still issue you a license, but some require you to pass a special road test or have restrictions on your license.

A handful of states also test peripheral vision — how much you can see to the sides. This is less common than acuity testing, but it matters because you need to see traffic and pedestrians outside your direct line of sight. If your state uses a peripheral vision test and you do not pass, you may be required to have special mirrors or other equipment on your vehicle.

Corrective lenses and license restrictions

If you pass the vision test while wearing glasses or contacts, your license will be marked "corrective lenses required." This is a legal restriction. You must wear the same type of correction you wore during the test every time you drive. Driving without them is a traffic violation and can result in a fine or points on your license, even if you can technically see without them.

If you wear contacts and you pass with contacts, you must wear contacts while driving — glasses alone will not satisfy the restriction. If you wear glasses and you pass with glasses, you must wear glasses while driving. If you switch to a different type of correction (glasses to contacts or vice versa), you should retake the vision test to make sure you still meet the standard, and your license will be updated to reflect the change.

If you pass the vision test without wearing any correction, no restriction will be added to your license. You are free to wear glasses or contacts while driving if you want to, but you are not required to.

What to bring and what to expect on test day

Bring your glasses or contacts if you wear them, even if you do not plan to use them during the test. Bring your current ID and any documents required for your license process — the vision test is usually one part of a longer appointment, and you will need everything at once.

The vision test itself usually takes 2 to 5 minutes. You will stand or sit in front of a chart with letters or symbols. The examiner will ask you to read lines of text, starting with large letters and moving to smaller ones. You will read with both eyes together, then cover one eye and read again. Tell the examiner if you cannot see a line clearly — do not guess or try to read letters you cannot actually see.

If the DMV office has a vision screening machine instead of a chart, you will look into a device and read letters or symbols on a screen inside. The process is the same, just automated. Some machines also test color vision or peripheral vision at the same time.

Frequently Asked Questions

Can I wear sunglasses during the vision test?

No. You must remove sunglasses and any tinted eyewear during the test. If you wear prescription sunglasses, you can wear them, but the examiner may ask you to remove them so they can see your eyes clearly. Regular glasses or contacts are fine.

What if I fail the vision test but I know I can see well enough to drive?

If you believe the test result is wrong, you can retake it when ready in most states. If you fail again, ask the examiner what the specific result was. You can then see an eye doctor and bring their report to the DMV. An eye doctor's letter confirming your vision is safe for driving can override a failed DMV test in some states.

Do I have to wear the same glasses I wore during the test every time I drive?

No — you have to wear corrective lenses if your license says "corrective lenses required," but they do not have to be the exact pair you wore during the test. As long as they correct your vision to the same standard, any glasses or contacts that work for you are legal. If your prescription changes significantly, you should retake the vision test.

What happens if I have one eye that is much worse than the other?

Most states test each eye separately and allow one eye to be worse than the other, as long as at least one eye meets the minimum standard. Some states require a minimum in each eye. The examiner will tell you the result for each eye. If one eye does not meet the standard, ask whether you can still be issued a license — the answer depends on your state's rules.

Can I retake the vision test if I want a better result?

Most states do not allow you to retake a passed vision test just to try for a better score. Once you pass, your result is recorded on your license. If your vision actually changes or your prescription changes, you can retake the test at your next license renewal or when you renew your license early.