DMV Vision Test Requirements: What to Expect and How to Pass

Most people spend weeks worrying about the written test and about ten seconds thinking about the eye test. Then they get to the counter, lean into the machine, and realize the letters on line five are a blur. The DMV vision test requirements aren't hard to meet for most people, but they're real, and a surprise here can end your visit before the knowledge test even starts.

Here's how the screening works, what standard you're measured against, and what happens if you don't pass on the spot.

How the DMV vision test works

The screening usually takes a couple of minutes. Depending on your state and office, it's one of these:

• A vision-testing machine. You look into a viewer and read letters or numbers off a lighted panel. Some machines also flash lights at the edges to check side vision.
• A wall chart. The classic Snellen chart, read from a marked spot on the floor.
• An eye doctor's report. In some cases you can submit a form completed by your own optometrist or ophthalmologist instead of, or in addition to, the in-office screening.

You'll usually read with both eyes open, and sometimes each eye separately. If you wear glasses or contacts for driving, wear them for the test. The clerk will note it, and that affects your license (more on that below).

The screening happens early in the visit, typically before the knowledge test, so treat it as step one of passing. Our guide on how long the permit test takes shows where it fits in the full visit.

DMV vision test requirements by state

Each state sets its own standard, but a common benchmark for an unrestricted license is 20/40 acuity, with or without corrective lenses. In plain terms, 20/40 means you can read at 20 feet what a person with typical vision can read at 40 feet.

Beyond that, states differ in the details:

Because the exact numbers vary, check your own DMV's vision page before you go. USA.gov's state motor vehicle services directory links to each state's agency.

Commercial drivers face a stricter federal standard. Under 49 CFR 391.41, an interstate CDL driver needs at least 20/40 in each eye and with both eyes together (with or without corrective lenses), a horizontal field of vision of at least 70 degrees in each eye, and the ability to recognize red, green and amber traffic signal colors. That's checked at the DOT medical exam, not the DMV counter.

Glasses, contacts and restriction codes

If you need corrective lenses to meet the standard, you'll pass, but your license will carry a corrective lenses restriction. It appears as a code or note on your card, and it means you must wear glasses or contacts whenever you drive.

A few practical points:

• Bring your glasses even if you usually wear contacts. If a lens is bothering you that day, you'll want a backup.
• The restriction is enforceable. If you're pulled over without your lenses, you can be ticketed for violating a license restriction.
• Getting the restriction removed usually means passing the vision test without lenses later, for example after laser eye surgery. Ask your DMV how to do that.

Peripheral vision and color

Side vision matters for driving because hazards come from the edges: a car pulling out of a driveway, a cyclist alongside you, a child stepping off the curb. Some vision machines test it by flashing lights to the left and right while you focus straight ahead. You simply say when you see them.

Color vision is a different story. Many people with color blindness drive, because traffic signals are in a fixed order (red on top or left, green at the bottom or right) and signs have distinctive shapes. Some DMV screenings include a color check, but standards vary. Knowing sign shapes is a smart backup, so review our guide to road sign shapes and colors. And bring the right paperwork so a vision referral is the only surprise: see the documents needed for a learner's permit.

If you fail: the eye doctor form

Failing the screening isn't the end. What usually happens:

1. The clerk refers you to an eye care professional. You'll typically get a vision report form for the doctor to complete. California's version, for example, is the Report of Vision Examination (DL 62).
2. You get an eye exam. Often the fix is simply new or first-time glasses.
3. You return with the completed form and, if needed, your new lenses. The DMV reviews the doctor's findings. In some cases the state's medical or vision review unit decides whether to issue a license with restrictions, a road test, or no license.

Don't panic if this happens before your permit test. It's common, especially for teens who've never had an eye exam and didn't know they needed glasses. Book the eye doctor quickly so your timeline doesn't slip. If you're also preparing for the written portion, our free practice tests are a good use of the waiting time.

Vision and renewals

The vision test isn't only for first-time applicants. Many states recheck vision at license renewal, and some require it more often for older drivers. Others accept a doctor's report or skip the screening for online renewals. If you're due to renew, our guide on how to renew your driver's license online explains when an in-person visit, and an eye test, is required.

If your vision changes between renewals, don't wait for the DMV to catch it. Driving with uncorrected vision that's slipped below your state's standard is unsafe, and an eye exam is a lot cheaper than a crash.

Frequently asked questions

What vision do you need to drive?

Many states use 20/40 as the standard for an unrestricted license, with or without glasses or contacts. Some allow restricted licenses for vision slightly below that, so check your state's exact rules.

What happens if I fail the DMV eye test?

You'll usually be given a form for an eye doctor to complete. Once you return it, and get glasses if needed, the DMV decides whether you can be licensed and with what restrictions.

Can I drive with one eye?

In many states, yes, if your vision in the other eye and your field of vision meet the state's standard. Rules vary, and commercial drivers face separate federal requirements.