To pass the DMV vision test, most states require visual acuity of at least 20/40 in your better eye, with or without glasses or contacts, plus enough peripheral vision to see hazards approaching from the sides. The screening takes under a minute, costs nothing beyond your normal license fee, and happens right at the counter. If you don’t meet the standard, you generally won’t lose your license on the spot; you’ll be referred for a fuller eye exam or offered a restricted license.
The 20/40 Standard
Visual acuity measures how sharply you can see at a distance. On the Snellen scale, 20/40 means you can read at 20 feet what someone with unimpaired vision reads at 40 feet. Nearly every state uses 20/40 in the better eye as the minimum for an unrestricted license, whether you reach that number naturally or with correction.
Between 20/40 and legal blindness, states take different paths. Many will issue a restricted license for acuity in the 20/50 to 20/70 range, commonly limiting you to daylight hours, lower-speed roads, or a set radius from home. Below 20/70 in the better eye, most states will not issue a standard license without additional medical evaluation and possibly adaptive equipment.
Peripheral Vision
Sharp central vision is only part of what the DMV checks. You also need enough field of view to detect vehicles and pedestrians at the sides. States that set a specific horizontal binocular field-of-vision standard most often require 140 degrees, though minimums across states run from about 105 to 150 degrees. If you have working vision in both eyes, this rarely poses a problem.
Drivers with sight in only one eye face closer scrutiny. Many states require monocular drivers to demonstrate at least 70 degrees of temporal vision and 35 to 50 degrees of nasal vision in the functioning eye, and often add restrictions such as outside mirrors on both sides of the vehicle or daylight-only driving, even when acuity in the good eye clears the standard threshold.
What the Screening Looks Like
You’ll look into a machine, often called an Optec or something similar, and read rows of letters or numbers that get progressively smaller. Some offices still use a wall-mounted Snellen chart. The examiner asks you to read a specific line with both eyes open, then may cover each eye in turn to test them individually. For most people, the whole thing is over in well under a minute.
In states that also test peripheral vision, the machine flashes small lights at the edges of your field while you look straight ahead, and you indicate when you see them without turning your head. Results come back on the spot. Pass, and you continue with the rest of your license transaction. Fall short, and the examiner explains your options right there at the counter.
Glasses, Contacts, and the “B” Restriction
If you need corrective lenses to reach 20/40, wear them for the test. Passing with correction adds a restriction code to your license record, which shows up as a “B” restriction on the physical card in most states. That code tells law enforcement you’re required to wear your glasses or contacts whenever you drive.
Driving without required correction is a citable offense in every state. Penalties range from a modest fine to a second-degree misdemeanor with possible jail time, depending on where you are. Beyond the ticket, a violation can complicate an insurance claim and create liability problems if you’re in an accident.
Removing the Restriction After LASIK or Similar Surgery
If refractive surgery has eliminated your need for correction, you’ll need to visit the DMV, pass the screening without lenses, and in most states provide a letter from your eye doctor confirming the surgical correction. Once you pass uncorrected, the DMV issues an updated license without the “B” restriction. Until that’s done, you’re technically in violation every time you drive without your glasses or contacts, even if you no longer need them to see.
If You Don’t Pass
Failing the screening doesn’t end your driving. The usual next step is a referral to a vision specialist for a comprehensive exam. The specialist evaluates whether your vision can be corrected to meet the minimum standards and completes a report covering acuity with and without correction, field of vision, and any recommended driving restrictions.
If that report shows you can meet the standard with correction or restrictions, the DMV may issue a restricted license. Common restrictions include daylight-only driving, no freeway driving, required corrective lenses, or mandatory outside mirrors on both sides. The DMV may also require a behind-the-wheel driving evaluation to confirm you can safely handle the vehicle with your limitations.
Watch the deadlines in any referral notice. States typically give you a specific window, often 30 to 90 days, to complete the specialist evaluation and return the paperwork. Missing that window can trigger automatic suspension of your driving privileges.
When the Test Comes Up at Renewal
How often you’re screened depends on your state and your age. About two dozen states require every driver to pass a vision test at each renewal. Another 19 add vision testing specifically for older drivers, typically starting somewhere between age 65 and 80. A few states begin earlier, requiring a test at the first renewal after age 40. Seven states don’t require a renewal vision test at any age.
The data behind age-based testing is meaningful. One study found that fatalities among drivers 80 and older in a state that adopted mandatory vision testing for that age group dropped by 17 percent. Separate research linked vision tests during in-person renewals to significantly lower crash hospitalization rates among drivers aged 60 to 74.1National Highway Traffic Safety Administration (NHTSA). Countermeasures That Work: Older Drivers – In-Person Renewal and Vision Test The American Association of Motor Vehicle Administrators recommends every driver renew in person and pass a vision test at least every four years.
Online and Mail Renewals
Remote renewal creates an obvious gap for vision testing, and states handle it differently. Some waive the in-person screening for certain renewal cycles but require it periodically. Others require you to be tested by an approved vision provider and submit the results electronically or on paper, even for remote renewals. A number of states cap the age at which you can renew remotely, typically requiring in-person visits starting anywhere from age 62 to 79. Check your state’s DMV website before assuming you can renew online without a recent exam.
Using Your Own Eye Doctor’s Report
Most states let you have your own optometrist or ophthalmologist perform the screening instead of using the DMV’s machine. You’ll need to bring a completed vision examination report form, which you can usually download from your state’s DMV website. The eye doctor fills it out and signs it, and the exam date typically has to fall within the prior six to twelve months.
Make sure every field is filled in. Missing information is one of the most common reasons people get sent back to their eye doctor, and it’s entirely avoidable. The doctor’s signature, license number, and exam date are the fields that cause the most trouble. Bring the original signed form, not a photocopy, unless your state specifically accepts electronic submissions through a vision provider registry.
Color Vision
Standard non-commercial licenses generally do not require a color vision test. Color-blind drivers can identify traffic signals by position, and most states treat that as sufficient. Commercial drivers face a different rule, discussed below.
Commercial Drivers Face Stricter Rules
If you hold or are applying for a commercial driver’s license, federal standards apply on top of your state’s. Under federal motor carrier safety regulations, you must have distant visual acuity of at least 20/40 in each eye individually, plus 20/40 binocularly, a field of vision of at least 70 degrees in the horizontal meridian in each eye, and the ability to recognize red, green, and amber traffic signal colors.2eCFR. 49 CFR 391.41 – Physical Qualifications for Drivers The key difference from a standard license is that 20/40 is required in each eye separately, not just the better eye.
Drivers who can’t meet the standard in their worse eye may still qualify under an alternative vision standard established by FMCSA. That pathway requires at least 20/40 in the better eye with a 70-degree horizontal field, the ability to recognize signal colors, a stable vision deficiency, and enough time since it stabilized to have adapted. An ophthalmologist or optometrist completes a Vision Evaluation Report, and a certified medical examiner decides whether you qualify. If approved, your Medical Examiner’s Certificate is valid for a maximum of 12 months, and first-time qualifiers must pass a road test administered by their employer.3Federal Register. Qualifications of Drivers; Vision Standard