What the DMV eye test chart measures

The DMV eye test chart, called a Snellen chart, measures how clearly you can see letters and symbols at a standard distance. During your vision screening at the DMV, you will stand about 20 feet from the chart and read lines of text that get progressively smaller. The examiner records what you can read accurately, which becomes part of your driving record and determines whether you need corrective lenses to drive legally.

The chart itself is not a pass-or-fail test in the way a written exam is. Instead, the DMV has a minimum vision standard — usually 20/40 vision in at least one eye, though this varies by state. If you fall below that standard without glasses or contacts, you will be required to wear them while driving, and your license will be marked with a restriction code.

The test takes about two minutes. You read aloud from the chart, the examiner notes which lines you can see clearly, and the result goes into the system when ready. You will know before you leave the DMV whether you passed, need corrective lenses, or need to see an eye doctor before you can be licensed.

Key Takeaways

  • The Snellen chart measures how clearly you see at 20 feet, and the DMV uses your result to decide if you need glasses or contacts to drive.
  • Most states require at least 20/40 vision in one eye; if you do not meet that standard, you cannot be licensed until you see an eye doctor.
  • Bring your current glasses or contacts to the DMV if you wear them, because the examiner will test you both with and without correction.
  • The vision test is part of every license renewal and every new license process, not just the first time you get licensed.
  • If you fail the vision test, you can retake it after seeing an eye care professional, but you cannot drive legally until you pass.

How the vision test works at your DMV appointment

When you arrive for your license appointment, the vision screening happens before you take the written test or road test. A DMV employee or contractor will call you to a small station with the Snellen chart mounted on the wall. You will stand at a marked line, usually 20 feet away, and read the chart without covering either eye first.

The examiner will ask you to read each line starting from the top, where the letters are largest. You continue downward until you reach a line where you cannot read most of the letters accurately. The examiner records the smallest line you could read clearly — for example, 20/40 or 20/60 — and then repeats the test on your other eye. If you wear glasses or contacts, the examiner will test you again with correction in place and record both results.

Some DMV offices use a different device called a vision screener — a machine you look into that displays the chart electronically. The process is the same: you read lines that get smaller, and the machine records your result. Either way, the test is quick and painless.

Vision standards that determine license restrictions

Every state sets its own minimum vision standard, but most require 20/40 vision in at least one eye to drive without restriction. If your best vision (with glasses or contacts if you wear them) is worse than 20/40, you cannot be licensed. If your vision is between 20/40 and 20/70, most states will license you but require you to wear correction while driving — this restriction will appear on your license.

Some states have additional standards for peripheral vision (how far to the side you can see) or for vision in each eye separately. A few states require better vision — 20/30 or even 20/25 — for certain license classes, such as commercial driver licenses. Your state's DMV website lists the exact standards that explore where you live.

If you have a condition that affects your vision — such as cataracts, macular degeneration, or severe astigmatism — the DMV may require you to see an eye doctor and bring a report before you can renew or obtain a license. This is separate from the vision test itself and depends on your state's medical review process.

What to bring and how to prepare

If you wear glasses or contacts, bring them with you to the DMV. The examiner will test you both with and without correction, and your license restriction will be based on your vision with correction in place. If you wear bifocals or progressive lenses, let the examiner know — they may ask you to position your head slightly to may support you are looking through the correct part of the lens.

You do not need to study or prepare for the vision test the way you would for the written exam. However, if you have had recent changes to your vision — new glasses, a new prescription, or blurred sight in one eye — mention this to the examiner. If your vision has changed significantly since your last test, the examiner may ask whether you have seen an eye doctor recently.

If you are unsure whether your vision meets the DMV standard, you can see an optometrist or ophthalmologist before your appointment. Many eye doctors can tell you whether you will pass the DMV test, and if you will not, they can prescribe correction that will help you pass. This costs money, but it saves you a wasted trip to the DMV.

What happens if you fail the vision test

If your vision does not meet your state's minimum standard, even with glasses or contacts, you will not be licensed that day. The DMV will give you a notice explaining the vision requirement and directing you to see an eye care professional. You cannot drive legally until you have been tested by an eye doctor and the DMV has received their report.

Schedule an appointment with an optometrist or ophthalmologist as soon as possible. Bring the DMV notice with you so the eye doctor knows what standard you need to meet. If a new prescription will help you reach that standard, the eye doctor can write one. If your vision cannot be corrected enough to meet the standard — for example, because of a medical condition — the eye doctor will document that, and you may not be able to obtain a license.

Once you have a new prescription or a report from the eye doctor, return to the DMV with that documentation. You can retake the vision test at that time. Many DMV offices allow you to schedule a quick retest appointment rather than going through the full license process process again.

Scams and misleading services to avoid

Do not use online "vision tests" or apps that claim to predict whether you will pass the DMV test. These are not accurate and may give you false confidence. The only valid vision test for DMV purposes is the one administered by the DMV itself or by a licensed eye care professional whose report the DMV accepts.

Some websites advertise services that claim to help you pass the DMV vision test or to bypass the test altogether. These are scams. There is no way to bypass the vision test, and no legitimate service can change your actual vision. If you cannot see well enough to drive safely, you should not drive, and the DMV will not license you to do so.

Be cautious of eye doctors who pressure you to buy expensive frames or lenses by claiming they are necessary to pass the DMV test. A basic prescription lens that corrects your vision to 20/40 or better is all you need. You can buy frames and lenses from any provider, not just the eye doctor's office.

Vision test requirements for license renewal

You will take a vision test every time you renew your driver license, not just when you first get licensed. The frequency of renewal varies by state — some require renewal every four years, others every eight years — but the vision test happens at each renewal. If your vision has changed, your license restriction may change as well.

If you have a restriction on your current license that requires you to wear glasses or contacts, you must wear them during the renewal vision test. If you do not, and your uncorrected vision fails the test, the DMV may suspend your license or require you to retake the test with correction.

Some states allow you to renew your license online or by mail if you have not had any changes to your address, name, or medical status. However, most states still require you to come in person for the vision test, even if you renew other parts of your license remotely. Check your state's DMV website to see what applies to your renewal.

Frequently Asked Questions

Can I wear sunglasses during the DMV vision test?

No. The examiner will ask you to remove sunglasses, tinted glasses, and any other eyewear except your regular prescription glasses or contacts. If you have light-sensitive eyes, mention this to the examiner — they may be able to dim the room slightly, but you cannot wear dark lenses during the test.

What if I can only see well out of one eye?

Most states allow you to be licensed if one eye meets the minimum vision standard, even if the other eye is blind or has very poor vision. However, your license will carry a restriction noting this condition. Some states may require additional testing or a report from an eye doctor before licensing you with vision in only one eye.

Do I have to retake the vision test if I get a new prescription between renewals?

No, you do not have to retake the test until your next scheduled renewal. However, if you are involved in an accident or if the DMV has reason to believe your vision has changed significantly, they may require you to take a new test. If you get a new prescription because your vision has worsened, it is a good idea to carry it with you in case you are asked to prove you can see well enough to drive.

What is the difference between 20/40 and 20/60 vision?

20/40 means you can see at 20 feet what a person with standard vision can see at 40 feet — your vision is half as sharp. 20/60 means you can see at 20 feet what a person with standard vision can see at 60 feet — your vision is one-third as sharp. The higher the second number, the worse your vision. Most states require 20/40 or better to drive without restriction.

Can I bring someone to help me during the vision test?

You can bring someone to your DMV appointment, but they cannot stand with you during the vision test itself. The test must be administered one-on-one between you and the examiner. If you need an interpreter or other accommodation, tell the DMV when you schedule your appointment so they can arrange it in advance.