To pass the vision test for a learner’s permit, you need to read the 20/40 line on an eye chart using whatever glasses or contacts you normally wear for distance, and you need enough side vision for the examiner’s peripheral check. The screening takes two or three minutes at the licensing counter, and you get your result on the spot. Failing doesn’t end your application; it sends you to an eye doctor who can usually get you back on track.
The 20/40 Standard
Almost every state sets the bar at 20/40 best-corrected visual acuity in your better eye. That means you can read at 20 feet what a person with textbook vision reads at 40 feet.1Federal Motor Carrier Safety Administration. Examining FMCSA Vision Standard for CMV Drivers and Waiver Program A few states are slightly more lenient, allowing 20/50 or 20/60 in at least one eye, but those are the outliers.
“Best-corrected” is the important part. You test with the glasses or contacts you use for distance, and the examiner reads the result through your prescription. Hit 20/40 with correction and you pass. The catch: if you only reach 20/40 with lenses, your permit will carry a corrective-lenses restriction, and you’ll be required to wear them any time you drive.
The Peripheral Vision Check
Sharpness is only half the test. Licensing agencies also measure how wide your field of vision stretches horizontally while you look straight ahead. Roughly two-thirds of states set a specific binocular horizontal field requirement. Among those, about 15 require 140 degrees; the rest range from 105 to 150 degrees.2American Medical Association. Legal Vision Requirements for Drivers in the United States
If your side vision falls short, the examiner flags the application. Some states will still issue a restricted permit with conditions like additional mirrors or a limited driving area. Others want an eye specialist to submit a detailed report before making any decision.
What the Screening Looks Like at the Counter
The test is quick and low-tech. You look into a viewfinder-style machine on the counter, or in some offices you read a standard Snellen wall chart from a marked distance. The examiner asks you to read a specific line of letters or numbers. Read the 20/40 line and you pass the acuity portion.
For the peripheral check, the machine flashes small lights at the far edges of your visual field while you keep your eyes fixed on a center point. You tell the examiner which side the light appeared on. There’s no trick to it and no studying that helps. You either see the light or you don’t.
How to Prepare
Bring your glasses or contact lenses. This sounds obvious, but people forget, and the examiner won’t pause the appointment while you drive home. If you normally wear contacts, have them in before you arrive. If you switch between contacts and glasses, bring whichever gives you the best distance vision, because that’s what you’ll be wearing behind the wheel.
Make sure your prescription is current. An old prescription that no longer corrects you to 20/40 will cause you to fail. If your last eye exam was more than a year or two ago and you’ve noticed any decline in your distance vision, see an optometrist before your appointment at the licensing office. It’s cheaper and less frustrating than failing and coming back.
What Happens If You Fail
Failing the initial screening doesn’t end the process. In most states, the licensing agency refers you to an optometrist or ophthalmologist, who runs a more thorough examination and fills out a state-specific vision report form. You submit that completed form back to the licensing agency. The agency then decides whether to issue a permit, issue one with restrictions, or deny the application.
Some states go further. If the specialist report shows borderline results, the agency may schedule a supplemental driving evaluation to see whether you can compensate behind the wheel. Others simply follow the specialist’s recommendation. Either way, move quickly: most states give you a limited window to submit the report before the application lapses.
If your vision can be corrected with an updated prescription, the fix is straightforward. Get new glasses or contacts, pass the screening on a return visit, and move forward. The specialist appointment adds cost, but it isn’t a dead end.
Restrictions That May Appear on Your Permit
Your screening result doesn’t just determine pass or fail. It also shapes the conditions under which you’re allowed to drive. Restrictions are printed on the permit as coded letters, and law enforcement checks them during traffic stops.
Corrective Lenses
If you need glasses or contacts to reach 20/40, your permit will carry a corrective-lenses restriction. The code letter varies by state, but the legal effect is the same: you cannot drive without your lenses in place. Getting pulled over without them is treated as a moving violation in most states, with fines that can reach $200 to $500 depending on the jurisdiction. Some states treat it as seriously as driving without a license.
Daylight Driving Only
Applicants whose corrected acuity falls between roughly 20/40 and 20/70 often receive a daylight-only restriction. The exact trigger varies by state, but the logic is consistent: if your vision is reliable in good light but not at night, you’re limited to driving between sunrise and sunset. Eye specialists can also recommend this restriction based on diagnosed conditions like night blindness or glare sensitivity.
Outside Mirrors
Drivers with reduced peripheral vision or sight in only one eye often receive a restriction requiring one or two additional outside mirrors on the vehicle. The extra mirror compensates for the blind spot created by limited side vision. This restriction can appear alongside daylight-only driving.
If You Have Vision in Only One Eye
Having sight in only one eye does not automatically disqualify you. Every state allows monocular drivers to obtain a license, though the requirements are stricter. Most states still require 20/40 acuity in the functioning eye, though a few allow up to 20/50.2American Medical Association. Legal Vision Requirements for Drivers in the United States
The bigger hurdle is the field-of-vision test, since one eye produces a naturally narrower horizontal field. States that measure this for monocular drivers set minimums ranging from 55 to 105 degrees in the functioning eye.2American Medical Association. Legal Vision Requirements for Drivers in the United States Expect additional restrictions on the permit, typically outside mirrors and sometimes daylight-only driving. Some states also require a specialist evaluation before issuing the permit.
If You Use Bioptic Telescopic Lenses
Bioptic lenses are small telescopes mounted in the upper portion of eyeglasses. The driver glances briefly through the magnified portion to read signs or spot distant hazards, and uses the regular lens below for general driving. Around 37 states allow some form of bioptic driving, though the rules vary considerably. Some require a training period, a behind-the-wheel evaluation, or certification from a low-vision specialist. Others restrict bioptic drivers to daylight hours and certain road types.
If your acuity without the bioptic falls below the standard minimum but improves through the telescope, you’ll typically need a consultation with a low-vision optometrist or ophthalmologist to determine eligibility. The specialist verifies your vision meets your state’s bioptic criteria and completes the required medical forms. Call your state licensing agency before starting the application, because the rules genuinely differ from state to state.
Color Blindness
Color blindness comes up in almost every conversation about driving vision tests, and the answer is reassuring: nearly all states allow color-blind drivers to obtain a permit without restriction. No standard color vision test is part of the learner’s permit screening in the vast majority of jurisdictions.3Federal Motor Carrier Safety Administration. Visual Disorders and Commercial Drivers Traffic signals are designed with position cues (red on top, green on bottom) so color-deficient drivers can respond safely. A small number of states require the ability to distinguish red, green, and amber, but even those rarely deny a license over color vision alone.
The Test Comes Back at Renewal
Passing the vision test for a learner’s permit isn’t a one-time event. The American Association of Motor Vehicle Administrators recommends drivers pass a vision test at least every four years at renewal, and most states follow some version of that. Some require an in-person screening at every renewal; others require it only after a certain age or at extended intervals. If your vision deteriorates between renewals, restrictions can be added or upgraded, and in severe cases driving privileges can be suspended until a specialist confirms adequate correction. Keeping your prescription current protects your license long after the permit stage.