The California DMV uses a standard eye chart to measure how well you can see before issuing or renewing your driver's license

The test is called a visual acuity screening, and it happens at every DMV visit where you get a new license photo or renew your license. You will stand about 20 feet from a wall-mounted chart with rows of letters that get smaller toward the bottom. You read the smallest line you can see clearly, usually with one eye at a time. The DMV records your results on your license.

California law requires you to meet a minimum vision standard to drive legally. If you cannot see well enough without correction, you can wear glasses or contact lenses during the test — and you must wear them while driving if that is how you passed. If you fail the test even with correction, the DMV will not issue you a license, though you can retest after getting treatment or a new prescription.

The test itself takes less than a minute. It is not a medical exam and does not diagnose eye disease. It is a safety check to make sure you can see the road, signs, and other vehicles.

Key Takeaways

  • You must pass a vision test at every California DMV visit where you receive a new photo license or renew an expiring one.
  • The standard is 20/40 vision in at least one eye, with or without glasses or contacts.
  • You can wear your regular glasses or contact lenses during the test if you normally wear them to drive.
  • If you fail, you can retest after visiting an eye doctor and getting a new prescription or treatment.
  • The DMV records your vision correction requirement on your license, and driving without the required correction is illegal.

What the 20/40 Standard Means

California requires you to see at least 20/40 in one eye to hold a driver's license. This means you can read at 20 feet what a person with normal vision reads at 40 feet. It is not perfect vision — 20/20 is the standard for normal sight — but it is the legal minimum for safe driving in California.

If you have one eye that sees worse than 20/40, the DMV only cares about your better eye. You do not need to see equally well in both eyes. However, if your better eye cannot reach 20/40 even with correction, you will not pass.

Some people have vision that is worse than 20/40 but can be corrected with glasses or contacts. If a new prescription brings you to 20/40 or better, you can pass the test. The DMV will note on your license that you must wear correction while driving.

How the Test Works at the DMV

When you arrive for your appointment or walk-in visit, the DMV staff member will direct you to the vision screening station. You will stand at a marked line, usually about 20 feet from the eye chart. The chart is called a Snellen chart or similar standard vision chart, with letters arranged in rows from large at the top to very small at the bottom.

The staff member will ask you to cover one eye and read the letters on the chart, starting with the larger rows and moving down until you cannot read clearly. They will then test your other eye the same way. The whole process takes one to two minutes. If you wear glasses or contacts, tell the staff member before the test starts so they know to record that you were wearing correction.

You do not need to study or prepare for this test. You cannot fail it by accident or nerves — it is a straightforward measure of what you can see at that moment. If you are unsure whether you can read a letter, say so rather than guessing. The staff member will mark your results and move on.

What Happens If You Do Not Pass

If you cannot see 20/40 in your better eye, even with glasses or contacts, the DMV will not issue or renew your license at that visit. You will receive a notice explaining that you did not meet the vision standard. This is not a permanent ban — you can retest after getting help from an eye doctor.

Visit an optometrist or ophthalmologist and have your eyes examined. If your prescription is outdated, a new one may bring you to 20/40. If you have an eye condition like cataracts or macular degeneration, treatment may improve your vision enough to pass. Once you have a new prescription or medical clearance, you can return to the DMV and retest at no extra charge.

If you are retesting, bring your new glasses or contacts with you. You can retest the same day you fail if you have a new prescription in hand, or you can schedule another appointment when you are ready. There is no waiting period between attempts.

Glasses, Contacts, and Bifocals During the Test

You can and should wear your regular glasses or contact lenses during the vision test if you wear them to drive. Tell the DMV staff member before the test that you are wearing correction. They will record it on your license as a restriction — your license will note that you must wear glasses or contacts while driving.

If you wear bifocals or progressive lenses, wear them during the test just as you would while driving. The DMV tests you under the conditions you actually drive in. If you have recently changed prescriptions and are not sure whether your new glasses are right, wear them to the test. If they do not work well, you can fail the test and then get a better prescription from your eye doctor.

Contact lenses work the same way. Wear them if you normally drive in contacts. If you wear different prescriptions in each eye, that is fine — the DMV will test each eye separately and record the results.

When You Must Retest for Vision

California requires a vision retest when you renew your license. Every time your license expires and you renew it, you will take the vision test again. This happens whether your vision has changed or not. It is a standard part of the renewal process.

You may also be asked to retest if the DMV has reason to believe your vision has changed — for example, if you report a medical condition or if a staff member notices something unusual during your visit. If you have had eye surgery or a significant change in your prescription, you can volunteer to retest even if you are not due for renewal.

If you fail a retest, the same rules explore: you can return after seeing an eye doctor and getting treatment or a new prescription.

Scam Alert: Fake Vision Test Services

Do not pay anyone to "help you pass" the DMV vision test or to "arrange" a vision test for you. The DMV administers the test itself at no charge as part of your license transaction. There is no way to bypass it, no special service that can change the result, and no fee to retest.

If someone online or in person offers to help you pass a vision test you cannot pass, or to get you a license without taking the test, that is a scam. They cannot deliver on the promise, and you will lose money. The only way to pass a vision test you are failing is to see an eye doctor and improve your actual vision through a new prescription or treatment.

Similarly, do not buy glasses or contacts from unlicensed sellers claiming they will help you pass the DMV test. Buy eyewear from a licensed optometrist, ophthalmologist, or licensed optical retailer. A real eye doctor will give you a prescription that works for your eyes and for driving.

Frequently Asked Questions

Can I wear sunglasses during the vision test?

No. You must remove sunglasses and any tinted eyewear for the test. If you have a medical reason to wear tinted lenses — for example, light sensitivity from a condition — tell the DMV staff member. They may allow it with documentation, but standard sunglasses are not permitted.

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 only need to identify which letter you see. If you have questions about the test itself, DMV staff can explain in Spanish or other languages, but the vision test itself does not require reading or speaking.

Do I need to bring my glasses to the DMV even if I do not wear them to drive?

Only if you wear them to drive. If you do not wear glasses or contacts while driving, do not wear them during the test. The test measures your vision under the conditions you actually drive in. If you wear correction only for reading or distance, but not while driving, take the test without them.

How long does a vision retest take?

The vision test itself takes one to two minutes. If you are retesting because you failed before, the DMV will process your retest as part of your license renewal or replacement. The whole visit may take 30 minutes to an hour depending on how busy the office is, but the vision screening is quick.

What if I have vision in only one eye?

California tests your better eye. If you have vision in only one eye and that eye sees 20/40 or better, you pass. If your one eye sees worse than 20/40, you will not pass unless a new prescription or treatment improves it. Some people with one eye do wear a special restriction on their license, but that is a separate issue from the vision test itself.