What the DMV Eye Exam Chart Measures

The DMV eye exam chart—usually the Snellen chart—measures how clearly you see letters and symbols at a standard distance, typically 20 feet. The test does not check for color blindness, depth perception, or peripheral vision. It is one part of a full vision screening that a DMV examiner or licensed optometrist performs before you renew or obtain a driver's license.

The chart itself is a white board with black letters arranged in rows. The largest letters sit at the bottom, the smallest at the top. You stand or sit 20 feet away and read aloud the smallest line you can see clearly. The examiner notes which line you stopped at and records your visual acuity as a fraction—most commonly 20/20, 20/40, or 20/60.

A result of 20/20 means you see at 20 feet what a person with standard vision sees at 20 feet. A result of 20/40 means you see at 20 feet what a person with standard vision sees at 40 feet—in other words, you need to be twice as close to see the same detail. Each state sets its own minimum passing score, but most require 20/40 or better in at least one eye.

Key Takeaways

  • The DMV eye chart tests how clearly you see letters at a distance, not color vision or side vision, and is only one part of the full eye exam.
  • Your score is written as a fraction like 20/20 or 20/40, where the first number is the test distance and the second is the distance at which a person with standard vision would see the same detail.
  • Most states require a minimum of 20/40 vision in at least one eye to pass, but some require 20/30 or better, so check your state's specific standard before your appointment.
  • If you wear glasses or contacts, you will take the test with them on, and the examiner will record whether the result is corrected or uncorrected vision.
  • Failing the chart does not automatically disqualify you from driving; many states allow you to retake it or pursue a restricted license with specific conditions.

How the Test Works at the DMV

When you arrive for your vision screening, the examiner will seat you in front of the chart at the marked distance—usually 20 feet, though some offices use a mirror setup that simulates 20 feet in a shorter space. You will cover one eye at a time and read the letters aloud, starting from the largest and moving down until you cannot read them clearly.

The examiner will note the smallest line you can read with each eye separately, then test both eyes together. If you wear glasses or contacts for driving, wear them to the appointment. The examiner will record whether your vision is corrected (with glasses or contacts) or uncorrected (without them). Most states care only about corrected vision for licensing purposes.

The entire chart test takes two to three minutes. After the chart, the examiner may perform additional checks—a peripheral vision test, a check for color blindness, or a test for your ability to see in low light. These vary by state and by whether you are renewing or obtaining a license for the first time.

What Each Vision Score Means for Your License

Your score on the chart determines whether you pass the vision portion of your DMV exam. The passing standard varies by state. Most states require 20/40 or better in at least one eye. Some states require 20/30 or better. A few states have different standards for different license types—for example, a commercial driver's license may require 20/25 in each eye.

If you score 20/20, you have passed with standard vision. If you score 20/40 and your state's minimum is 20/40, you have passed. If you score worse than your state's minimum—for example, 20/60 when the minimum is 20/40—you will not pass the vision test on that visit. You will be told what your options are, which usually include retaking the test after a waiting period or obtaining a restricted license.

A restricted license typically limits when or where you can drive—for example, daylight driving only, or driving within a certain distance of your home. The examiner will explain whether a restricted license is available in your state and what the restrictions would be for your specific vision score.

Preparing for the Eye Exam Chart Test

If you wear glasses or contacts, bring them with you. Do not wear sunglasses into the testing room. If you have had recent eye surgery or a significant change in your vision, tell the examiner before the test begins—this information helps them interpret your results and may affect whether you need to see an eye doctor before your license is renewed.

You do not need to study for the chart test. The letters are standard and the test measures your actual vision on the day of the exam, not your knowledge. However, if you suspect your vision has changed since your last exam, consider visiting an optometrist or ophthalmologist before your DMV appointment. A current prescription ensures you will test with the best correction available to you.

Arrive well-rested and alert. Vision can be affected by fatigue, eye strain, or dry eyes. If you have been driving for hours or staring at a screen, take a break before your DMV appointment. Some offices allow you to request a few minutes to rest your eyes before the test if you arrive tired.

What Happens If You Fail the Vision Test

Failing the vision portion of your DMV exam does not mean you cannot drive. It means you cannot drive with your current license status in your state. Your options depend on your state's rules and your specific vision score.

Most states allow you to retake the vision test after a waiting period—usually 24 hours to one week. Some states require you to see an eye doctor and bring documentation of your vision before you can retake the DMV test. Other states offer a restricted license when ready, allowing you to drive under specific conditions while you work on improving your vision or obtaining a better prescription.

If you believe the test result was inaccurate, ask the examiner whether you can retake it the same day. Some offices allow one retest when ready. If you consistently fail the chart test even with your best correction, you will need to see an eye doctor to determine whether your vision can be improved with a new prescription or whether there is an underlying eye condition that needs treatment.

State-Specific Vision Standards

Each state sets its own minimum vision requirement for a driver's license. Most states require 20/40 or better in at least one eye. Some states require 20/30 or better. A few states require 20/25 or 20/20. Some states have different standards depending on whether you are renewing a regular license or obtaining a commercial driver's license.

Your state's DMV website lists the specific vision standard for your license type. If you are unsure what your state requires, contact your local DMV office or check the website before your appointment. Knowing the standard in advance helps you understand whether you are likely to pass and what your options are if you do not.

Some states also have rules about vision in each eye separately. For example, a state might require 20/40 in at least one eye, but also require that your vision in the other eye is not worse than 20/70. Check your state's specific rules, as they can affect whether you pass the test or receive a restricted license.

The Difference Between the Snellen Chart and Other Vision Tests

The Snellen chart is the most common vision test at the DMV, but some offices use other charts—the Tumbling E chart, which shows the letter E in different orientations, or the Landolt C chart, which shows the letter C with gaps in different positions. All three measure the same thing: how clearly you see details at a distance. The results are recorded the same way, as a fraction like 20/20 or 20/40.

The DMV may also perform a visual field test, which checks whether you can see objects to the sides without moving your eyes. This test is less common at routine renewals but may be required if you have a history of eye disease or if you failed the chart test. A visual field test uses a machine where you look straight ahead and press a button when you see a light appear in your peripheral vision.

Some states use automated vision screening machines that measure your vision electronically without requiring you to read a chart aloud. These machines are faster and produce a printed result, but they measure the same visual acuity as the traditional chart. The passing standard remains the same regardless of which method your state uses.

Frequently Asked Questions

Can I wear my glasses or contacts during the DMV eye exam?

Yes. Wear whatever correction you normally use for driving. The examiner will record whether your vision is corrected or uncorrected. Most states care only about your corrected vision for licensing purposes, so if you see 20/20 with glasses but 20/60 without them, you pass the test as long as you wear your glasses while driving.

What if I score 20/40 in one eye and 20/60 in the other?

Most states require 20/40 or better in at least one eye, so you would pass. However, some states have additional rules about the vision in your weaker eye. Check your state's specific standard. If your weaker eye is significantly worse, you may receive a restricted license that requires you to wear corrective lenses while driving.

Do I need to see an eye doctor before my DMV vision test?

Not required, but recommended if your vision has changed or if you are unsure whether your current prescription is up to date. An eye doctor can provide a current prescription that may help you pass the DMV test. If you fail the chart test, some states require an eye doctor's report before you can retake it.

How often do I have to retake the vision test?

Vision testing is part of every license renewal. The renewal period varies by state—typically every four to eight years for a regular driver's license. You do not retake the vision test between renewals unless you renew your license or explore for a new one. If you fail the test, you may be required to retake it after a waiting period, usually 24 hours to one week.

What if I fail the chart test but my eye doctor says my vision is fine?

Ask your eye doctor to provide a written report of your vision test results. Bring this to the DMV and ask whether you can retake the chart test or whether the eye doctor's report can be used instead. Some states allow an eye doctor's report to override a failed DMV chart test if the report shows better vision. Other states require you to pass the DMV chart test regardless of what an eye doctor reports.