The vision test checks whether you can see well enough to drive safely

The vision test is a separate requirement from the written knowledge test. While the knowledge test measures what you know about traffic laws and safe driving, the vision test measures your actual ability to see the road, signs, and hazards. Most states require you to pass a vision screening before you can take the written test or before your license is issued.

The test itself is brief — usually two to five minutes. A DMV staff member or automated machine checks your visual acuity (how clearly you see at a distance), and some states also test your peripheral vision (what you can see to the sides without moving your eyes) and color recognition (whether you can distinguish red and green traffic lights). You will look through a machine called a vision screener or read a chart on the wall, depending on the equipment your local DMV uses.

The passing standard is consistent across most states: you must see at least 20/40 vision in each eye, with or without correction. That means what a person with normal vision sees at 40 feet, you must be able to see at 20 feet. If you wear glasses or contacts, you take the test wearing them — and your license will be marked with a restriction requiring you to wear correction while driving.

Key Takeaways

  • The vision test measures how clearly you see at a distance and, in some states, your peripheral vision and ability to see traffic light colors.
  • You must achieve at least 20/40 vision in each eye to pass; if you wear glasses or contacts, you take the test with them on.
  • If you fail the vision test, you can retake it after visiting an eye doctor and obtaining a corrective lens prescription or medical clearance.
  • Some states allow you to bring a recent eye exam report from an optometrist or ophthalmologist instead of taking the DMV vision test.
  • Vision requirements vary slightly by state and by license type — commercial driver's licenses have stricter standards than regular licenses.

What the vision screener actually tests

The standard vision test at the DMV focuses on visual acuity — how sharply you can see objects at a distance. You will look into a machine or at a wall chart and read letters or numbers that get progressively smaller. The DMV records the smallest line you can read accurately in each eye. This is the familiar 20/20, 20/40 measurement you may have heard from an eye doctor.

Many states also test peripheral vision, which is your ability to see objects to the sides without turning your head. This matters for driving because you need to notice vehicles and pedestrians approaching from the side. The test usually involves looking straight ahead while the examiner or machine checks whether you can detect movement or objects in your outer field of view.

Some states test your ability to recognize traffic light colors — specifically red and green. This is a quick color discrimination check, not a full color blindness test. You may be shown colored lights or asked to identify colored circles. If you have red-green color blindness, you may still pass if you can distinguish the position of the lights (red on top, green on bottom) rather than the color itself.

Passing score and what happens if you fail

The minimum passing vision is 20/40 in each eye. Some states allow one eye to be slightly worse if the other is better, but most require both eyes to meet the standard. If you wear glasses or contacts, you take the test with them on, and your license will carry a restriction code — usually something like "corrective lenses required" — that means you must wear them every time you drive.

If you fail the vision test, you cannot proceed with your license process that day. You will need to see an eye care professional — an optometrist or ophthalmologist — who can test your vision more thoroughly and determine whether you need a new prescription, whether a medical condition is affecting your sight, or whether you are not a safe driver from a vision standpoint. Some conditions, like untreated cataracts or severe macular degeneration, may result in a medical denial of your license.

After you see an eye doctor, you have two options: return to the DMV with a new prescription and retake the vision test, or bring a signed letter or report from the eye doctor stating that you meet the state's vision standard for driving. Many states accept the eye doctor's report in place of a retest, which saves you a second trip to the DMV.

State differences in vision requirements

Most states use the 20/40 standard, but a few states are stricter. Some require 20/30 vision, and a handful require 20/20 or better. A few states also have different standards depending on the type of license — a commercial driver's license (CDL) typically requires 20/40 in each eye and a wider peripheral vision field than a regular passenger license.

Some states test peripheral vision as part of the standard screening; others do not. A few states require a formal eye exam report from a licensed eye doctor rather than allowing you to take the DMV vision test. Check your state's DMV website or call your local office to confirm what your state requires before you go in for your appointment.

If you are renewing your license by mail or online, you may not need to retake the vision test unless your state requires it or unless your previous license had a vision restriction that has changed. Some states waive the vision retest for routine renewals if you have not had any accidents or violations.

What to bring and how to prepare

Bring your current glasses or contacts if you use them. Even if you think your vision is fine without correction, wearing them during the test is safer and more honest — your license restriction will match how you actually drive. If you have recently changed your prescription, bring your new glasses or get your new contacts before your DMV appointment.

If you have had recent eye surgery, cataract removal, or a change in your vision, bring documentation from your eye doctor. Some states will postpone your vision test if you are recovering from an eye procedure and ask you to return after healing is complete.

You do not need to study for the vision test the way you would for the written knowledge test. However, if you know your vision is poor or has changed, schedule an eye exam before your DMV appointment. This prevents a failed test and a wasted trip. Many eye doctors can provide a letter confirming you meet the state standard, which you can bring to the DMV instead of retaking the screener.

Vision restrictions on your license

If you pass the vision test while wearing glasses or contacts, your license will be marked with a restriction code. The exact wording varies by state, but it typically says "corrective lenses required" or "vision correction required." This is a legal restriction — you must wear your glasses or contacts every time you drive, even for a short trip to the store. Driving without the required correction can result in a ticket and points on your record.

Some states also add restrictions for other vision-related conditions. For example, if you have limited peripheral vision, your license might require you to use outside mirrors or prohibit night driving. These restrictions are based on your eye doctor's assessment and the state's medical review process, not just the DMV vision screener.

If your vision changes after you receive your license, you are responsible for notifying the DMV. Many states require you to report a significant vision change, and some allow you to voluntarily surrender your license if you no longer meet the standard. Driving with vision that no longer meets the state requirement is illegal and dangerous.

Frequently Asked Questions

Can I take the vision test without glasses if I normally wear them?

You can, but it is not recommended. If you fail without glasses and then pass with them, your license will carry a restriction requiring you to wear them while driving. It is better to take the test the way you actually drive. If you wear glasses or contacts, wear them during the test.

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

Most states require each eye to meet the 20/40 standard separately. If one eye is worse, you will fail. You will need to see an eye doctor to determine whether a new prescription, surgery, or medical treatment can improve your vision enough to pass. Some conditions cannot be corrected, and the DMV may deny your license on medical grounds.

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

It depends on your state and the type of renewal. Some states require a vision retest at every renewal; others only require it if you renew in person at the DMV office. Mail-in and online renewals often skip the vision test. Check your state's renewal rules or call your local DMV to confirm.

What happens if I am colorblind?

Red-green colorblindness does not automatically disqualify you. Most states test whether you can distinguish traffic light colors by position and brightness, not just by color. If you have colorblindness, you will still pass as long as you can tell the difference between red and green lights in real driving conditions.

Can my eye doctor's report replace the DMV vision test?

Many states allow it. If your eye doctor provides a signed letter or report stating that you meet the state's vision standard for driving, you can bring it to the DMV instead of taking the screener. Call your DMV office first to confirm they accept eye doctor reports and what format they need.