The Snellen Chart Is the Standard Vision Test at the DMV

The Snellen eye chart is the wall chart with rows of letters that get smaller toward the bottom — the one you read during your vision screening at the DMV. You stand 20 feet away and read the smallest line you can see clearly with each eye. The DMV uses this test to check whether your vision meets the state's minimum standard for a driver's license.

Most states require you to see at least 20/40 vision in at least one eye to drive without restrictions. Some states allow 20/60 or 20/70 with a corrective lens restriction on your license. A few states have different standards for commercial licenses. The Snellen chart measures this by showing how clearly you see at 20 feet compared to what a person with standard vision sees at that distance.

You do not need to study for this test or memorize the chart. The DMV staff will guide you through it. If you wear glasses or contacts, bring them — the test measures your vision with correction if you normally drive with it.

Key Takeaways

  • The Snellen chart is a standard wall chart with rows of letters used to measure how clearly you see at 20 feet.
  • Most states require 20/40 vision in at least one eye, though some allow 20/60 or 20/70 if you wear corrective lenses.
  • Bring your glasses or contacts to the DMV if you wear them while driving, because the test measures your corrected vision.
  • If you cannot read the required line, you may be offered a retest, referred to an eye doctor, or denied a license until you pass.
  • Each state sets its own vision standard, so requirements vary by location.

How the DMV Administers the Snellen Test

When you arrive at the DMV for a license test or renewal, the staff will direct you to stand at a marked line, usually 20 feet from the chart. They will ask you to cover one eye and read the letters aloud, starting from the top and moving down until the letters become too small to read clearly. Then you repeat the process with the other eye.

The DMV staff will note which line you can read on each eye. The line you read is expressed as a fraction — 20/20 means you see at 20 feet what a person with standard vision sees at 20 feet. A score of 20/40 means you see at 20 feet what standard vision sees at 40 feet, so your vision is half as sharp. The DMV compares your score to your state's minimum requirement.

If you wear glasses or contacts, tell the staff before the test begins. They will note on your record that the test was done with correction. If you normally drive with correction but take the test without it, you may fail even if you would pass with your glasses on.

What Happens If You Do Not Meet the Vision Standard

If your vision falls below your state's minimum, the DMV will not issue or renew your license on that day. The next step depends on your state's rules and how far below the standard you scored.

Some states offer an when ready retest — you may have misread a letter or blinked at the wrong moment. If you fail the retest, most states will ask you to see an eye doctor and bring a signed report of your vision. The eye doctor's report must show that you meet the state's standard with glasses, contacts, or surgery. You then return to the DMV with that report to get your license.

A few states deny the license outright and require you to wait a set period before reapplying. Others issue a restricted license that requires you to wear corrective lenses while driving. Check your state DMV's website to learn what happens after a failed vision test in your location.

Vision Standards Vary by State and License Type

No single vision requirement applies everywhere. Most states use 20/40 as the minimum for a regular driver's license, but some allow 20/60 or 20/70 if you wear glasses or contacts. A handful of states have a 20/30 standard. Commercial driver's license (CDL) holders usually face a stricter standard — often 20/40 in each eye separately, not just one eye.

Some states also test your peripheral vision or ability to see in low light, though the Snellen chart itself measures only central vision clarity. If you are renewing your license and your vision has changed, the DMV will test you again. If you have had eye surgery, cataract removal, or a significant change in your prescription, your vision may improve enough to remove a restriction from your license.

Look up your state's specific vision standard on your state DMV website before your appointment. If you are close to the minimum or have had recent vision changes, consider seeing an eye doctor first so you know whether you will pass.

Preparing for Your Vision Test at the DMV

Bring your current glasses or contacts if you wear them while driving. The DMV will test you with correction if that is how you normally see the road. If you have recently changed your prescription, bring your new glasses — do not wear an old prescription to the test.

Get a good night's sleep before your appointment. Eye strain and fatigue can affect how clearly you read the chart. If you have been staring at a screen all morning, take a break before you go to the DMV.

Do not try to memorize the Snellen chart or study it beforehand. The chart is designed to measure your actual vision, not your memory. The DMV may use different versions of the chart or rotate it to prevent memorization. If you are worried about passing, the best preparation is an eye exam with an optometrist or ophthalmologist.

When You May Need an Eye Doctor's Report

If you fail the Snellen test at the DMV, most states require you to see an eye doctor before you can get a license. The eye doctor will perform a full vision exam and issue a report stating whether you meet your state's standard with correction. You bring this report back to the DMV along with your failed test result.

Some states allow you to choose any licensed optometrist or ophthalmologist. Others have a list of approved providers. A few states allow you to use a vision report from an eye doctor dated within the past 30 or 60 days, so if you have a recent exam, bring that instead of scheduling a new one.

The eye doctor's report typically costs between $50 and $150, depending on your location and whether you need a full exam or just a vision certification. This is a separate cost from the DMV's license fee.

Frequently Asked Questions

What if I cannot read the chart because I do not speak English?

The Snellen chart uses letters, not words, so language is not a barrier. You straightforward read the letters aloud. If you have difficulty understanding the DMV staff's instructions, ask for an interpreter — most DMVs can provide one or allow you to bring your own.

Can I retake the vision test if I fail?

Most states allow an when ready retest on the same day. If you fail the retest, you will need an eye doctor's report before the DMV will issue a license. Some states require you to wait a set number of days between retests.

Does the Snellen chart test color blindness?

No. The Snellen chart tests only how clearly you see letters and shapes. Color blindness is not tested at the DMV in most states, and it does not prevent you from getting a driver's license. Some states test color vision separately if you are explore for a commercial license.

What if I have had eye surgery since my last license?

Tell the DMV staff about your surgery before the vision test. Your vision may have improved, and you might be able to remove a corrective lens restriction from your license. Bring any paperwork from your eye surgeon showing the surgery date and results.

Is the vision test the same at every DMV office?

The Snellen chart and the 20-foot distance are standard across all DMV offices in your state. However, the specific chart version, lighting, or how staff administer the test may vary slightly between locations. The vision standard your state requires is the same everywhere.