What the DMV vision test chart measures

The DMV vision test chart, usually called a Snellen chart, measures how clearly you can see letters and numbers at a standard distance — typically 20 feet in a DMV office. The chart has rows of letters that get progressively smaller from top to bottom. You stand at the marked line, cover one eye, and read aloud as far down as you can. Then you repeat with the other eye.

The test produces a number like "20/40" or "20/20". The first number is always 20 — the distance you stand from the chart. The second number is the distance at which a person with normal vision could read the same line. So 20/40 means you need to stand 20 feet away to read what someone with normal vision could read from 40 feet away. You are seeing less detail than average.

Most states require you to see at least 20/40 in at least one eye to get an unrestricted driver's license. Some states allow 20/60 or 20/70 with restrictions. A few states require 20/30. The exact standard varies by state, so check your state's DMV website for the specific number.

Key Takeaways

  • The Snellen chart test measures how clearly you see at 20 feet, and the result is written as a fraction like 20/40 or 20/20.
  • Most states require at least 20/40 vision in one eye to drive without restrictions, but some states have different thresholds.
  • If you fail the vision test, you can usually retake it the same day or schedule another appointment, and you can wear corrective lenses during the test.
  • Bring your glasses or contacts to the DMV if you normally wear them, because the test measures your vision with correction if you use it.

How the test works at your DMV appointment

When you arrive for your vision test, the DMV staff member will seat you at a specific distance from the chart — usually marked on the floor. You will be asked to cover one eye completely, usually with a small paddle or your hand. Then you read the letters aloud, starting from the top and moving down until the letters become too small to read accurately.

The examiner notes which line you stopped at. Then you cover the other eye and repeat. Some DMVs also test your peripheral vision — your ability to see to the sides without moving your eyes — using a machine or by asking you to count fingers held at the edge of your vision.

If you wear glasses or contacts, wear them to the test. The DMV measures your vision with correction, not without it. If you have had recent changes to your prescription, consider getting an eye exam before your DMV appointment so your correction is current. If you fail the test, most DMVs allow you to retake it the same day or schedule a new appointment within a few days.

What happens if you fail the vision test

Failing the vision test does not automatically deny you a license. The DMV will tell you that you did not meet the vision standard and explain what comes next. In most states, you can retake the test when ready or within a few days. Some DMVs require you to schedule a new appointment; others let you try again the same day.

If you fail a second time, you have options. You can get an eye exam from an optometrist or ophthalmologist and bring the results to the DMV. Many states will accept a doctor's letter stating that your vision meets the standard, even if you could not read the chart clearly. You can also ask about a restricted license — a license that limits when or where you can drive, such as daytime driving only or driving within a certain distance of home.

Some states offer a medical review process where a DMV medical officer evaluates your vision and decides whether you can drive safely despite not meeting the standard threshold. This is separate from the chart test and may involve additional testing.

Preparing for an accurate vision test

Get a good night's sleep before your DMV appointment. Eye strain and fatigue can make it harder to read small letters. If you wear glasses or contacts, clean them before you go — smudges and dust affect how clearly you see the chart.

If you have had a recent eye prescription change, bring your new glasses or contacts. Do not wait to use them until after you fail the test. The DMV measures your vision with your current correction, so using outdated glasses will only hurt your results.

If you have any eye condition — such as cataracts, macular degeneration, or diabetic retinopathy — bring documentation from your eye doctor. The DMV may ask about medical conditions that affect vision, and having a doctor's letter explaining your situation can help if you are close to the passing threshold.

Scam alert: fake vision test results

Do not buy fake vision test results or letters from online services claiming to be eye doctors. The DMV verifies doctor credentials and will reject forged documents. Using a fake letter is fraud and can result in criminal charges, license suspension, and civil liability if you cause an accident while driving on a fraudulent license.

If you genuinely cannot pass the vision test, the legal options are retaking it, getting an actual eye exam and bringing real results, or requesting a restricted license. These routes take longer but they are the only ones that protect you legally.

Vision test requirements by state

Vision standards vary significantly by state. Most states require 20/40 in at least one eye for an unrestricted license. Some states require 20/30. A handful of states allow 20/60 or 20/70 with restrictions. A few states test both eyes together and require a combined standard.

Some states also have separate standards for commercial driver's licenses (CDLs), which are stricter than standards for regular passenger vehicle licenses. If you are getting a CDL, ask the DMV about the specific vision requirement before your appointment.

Check your state's DMV website or call your local DMV office to confirm the exact vision standard for your state and license type. The requirement may also depend on whether you are renewing an existing license or getting your first license.

What to bring to your vision test

Bring your current glasses or contacts if you wear them. Bring your state ID or passport. Bring any documentation from an eye doctor if you have a vision condition or a recent prescription change. Some DMVs also ask for proof of residency, such as a utility bill or lease, though this varies by state.

If you have had eye surgery or have a medical condition affecting your vision, bring a letter from your eye doctor describing the condition and your current vision. This is not required to take the test, but it can be helpful if you fail and need to explain your situation to a DMV medical officer.

Frequently Asked Questions

Can I wear my glasses during the DMV vision test?

Yes. The DMV tests your vision with any correction you normally use — glasses, contacts, or both. Wear whatever you use to drive. If you have recently changed your prescription, wear your new glasses or contacts to the test.

What does 20/40 vision mean?

It means you need to stand 20 feet away to read letters that a person with normal vision could read from 40 feet away. You see less detail than average, but most states allow you to drive with 20/40 vision in at least one eye.

Can I retake the vision test if I fail?

Yes. Most DMVs let you retake the test the same day or within a few days. If you fail twice, you can get an eye exam from an optometrist or ophthalmologist and bring the results to the DMV, or you can ask about a restricted license.

What if I have an eye condition like cataracts?

Bring a letter from your eye doctor describing your condition and your current vision. If you cannot pass the standard vision test, the DMV may review your medical documentation and decide whether you can drive safely with restrictions or with a medical exception.

Do I need a perfect vision test score to get a license?

No. You need to meet your state's minimum standard, which is usually 20/40 in at least one eye. You do not need 20/20 vision. If you are close to the standard but not quite there, ask about a medical review or a restricted license.