Vision requirements for a driver's license vary by state, but all states set a minimum standard you must meet to drive legally

Every state requires you to pass a vision test before you get or renew a driver's license. The test checks how well you see at a distance, because you need to read road signs and spot hazards from far away. Most states require you to see at least 20/40 vision in each eye, though some are stricter. If you wear glasses or contacts, you can take the test with them on — and if you pass that way, your license will have a restriction saying you must wear them while driving.

The vision test itself is straightforward: you read letters on a chart from a set distance, usually 20 feet away. The examiner records what you can see clearly. If you fail, you can usually retake it the same day or come back later. Some states also check your peripheral vision (side vision) and your ability to see in color, though color blindness alone does not automatically disqualify you.

Key Takeaways

  • Most states require 20/40 vision or better in at least one eye, though some require 20/30 or 20/20.
  • You can wear glasses or contacts during the vision test, and your license will note that requirement if you pass with them.
  • If you fail the vision test, you can usually retake it the same day or schedule another appointment.
  • Some states check peripheral vision and color vision, but requirements and what disqualifies you vary by state.
  • Your state's DMV website lists the exact vision standard for your state and what happens if you do not meet it.

What the 20/40 standard actually means

The numbers in "20/40 vision" describe what you can see compared to what a person with normal sight can see. The first number is the distance you stand from the chart — 20 feet. The second number is the distance at which a person with normal vision could read the same letters. So 20/40 means you have to stand 20 feet away to read what someone with normal vision could read from 40 feet away. You see half as much detail.

This is why 20/40 is the floor for most states: it is the minimum distance at which you can safely read a road sign before you pass it. If your vision is worse than 20/40, you cannot see signs in time to react. Some states set the bar higher — 20/30 or even 20/20 — because they want drivers to spot hazards sooner. A few states allow 20/50 or 20/60 in one eye if your other eye meets the standard, but this varies.

How to find your state's exact requirement

Your state's Department of Motor Vehicles (DMV) website publishes the vision standard you must meet. Search "[your state] DMV vision requirements" and look for a page titled "Vision Standards" or "Medical Requirements." The page will tell you the minimum acuity, whether both eyes must meet it or just one, and what happens if you fail.

Some states also list what medical conditions or medications might affect your ability to pass. If you wear glasses or contacts, bring them to your test. If you have had eye surgery, cataract removal, or a condition like macular degeneration, tell the examiner before the test starts — they need to know your history to interpret the results correctly.

What happens if you fail the vision test

If you do not meet your state's vision standard, you will not get a license that day. Most DMVs let you retake the test when ready or within a few days. Some require you to see an eye doctor first and bring a signed form confirming your vision, especially if you failed by a large margin.

If you wear glasses or contacts and failed without them, the examiner will test you with them on. If you pass that way, your license will say "Corrective lenses required" — you must wear them every time you drive, or you are breaking the law. If you fail even with correction, you will need to see an optometrist or ophthalmologist. They can tell you whether your vision can be corrected to the legal standard, or whether you cannot drive safely in your state.

Corrective lenses and license restrictions

If you pass the vision test while wearing glasses or contacts, your license will carry a restriction code. The exact code varies by state, but it means you are legally required to wear your correction while driving. Driving without them, even if you think you can see fine, is a violation and can result in a ticket.

If your vision changes — you get new glasses, have cataract surgery, or your eyesight gets worse — you do not have to retake the test until your license renewal. However, if you are pulled over and an officer notices you are not wearing your required correction, you can be cited. It is your responsibility to keep your glasses or contacts current and with you when you drive.

Medical conditions that may affect your vision test

Certain conditions can make it hard to pass a vision test, even if you can see well on most days. Cataracts, macular degeneration, diabetic retinopathy, glaucoma, and retinitis pigmentosa all affect how much detail you can see or how wide your field of vision is. If you have one of these conditions, tell the examiner before the test. They will note it in your record.

Some states have a process for drivers with progressive eye conditions: you may get a license with a shorter renewal period (one or two years instead of the usual four to eight) so your vision can be checked more often. Other states may require you to see an eye doctor regularly and bring updated paperwork. A few states will not issue a license if your condition makes driving unsafe, even with correction. Your eye doctor can tell you whether your condition meets your state's standard.

Frequently Asked Questions

Can I wear sunglasses during the vision test?

No. The examiner needs to see your eyes clearly and test your vision in standard lighting. You can wear regular glasses or contacts, but not sunglasses or tinted lenses. If you have a medical reason for tinted lenses (like severe light sensitivity), tell the examiner before the test and bring documentation from your eye doctor.

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

Most states require only one eye to meet the standard, not both. So if your left eye is 20/40 and your right eye is 20/100, you can still get a license. The examiner will test each eye separately and record the results. If you wear glasses or contacts that correct one eye but not the other, your license will still require correction.

Do I have to retake the vision test when I renew my license?

Yes. Every time you renew, you will take a new vision test at the DMV. The standard does not change, but your vision may have. If your vision has gotten worse and you now need glasses, or if your glasses prescription has changed, the renewal test will catch that and your license will be updated.

What if I am colorblind?

Colorblindness alone does not disqualify you from driving in most states. The vision test focuses on acuity (how sharp your sight is) and peripheral vision, not color perception. However, if your colorblindness is severe enough that you cannot distinguish red from green traffic lights, some states may restrict your license or require you to take an additional test. Check your state's DMV website for specifics.

Can I get a license if I am blind in one eye?

It depends on your state and how well your other eye sees. Most states allow you to drive if your better eye meets the vision standard (usually 20/40 or better). Some states require 20/30 or better in the good eye to compensate for the lack of peripheral vision from the blind eye. A few states have additional restrictions, like requiring you to take a special driving test. Contact your state DMV to find out the rule where you live.