In most states, the minimum vision required for driving is 20/40 corrected acuity in at least one eye, measured with glasses or contacts if you wear them. If your corrected vision falls between 20/40 and roughly 20/70, you can usually still drive on a restricted license with conditions attached, such as daylight-only hours or no freeway travel. Once corrected vision in your better eye drops to 20/200, nearly every state will refuse to issue a license.
What the 20/40 Number Actually Means
Visual acuity is written as a ratio. The first number is the distance you stand from the chart, always 20 feet. The second number is how far away a person with textbook-normal vision could stand and still read the same line. So 20/40 means you need to be 20 feet from a sign that someone with healthy eyes could read from 40 feet. You’re seeing at half the useful distance.
At 20/70, the gap widens. At 20/200, the legal threshold for blindness, a person with normal vision could read from 200 feet what you can only read at 20. The reason licensing agencies care about these specific cutoffs is practical: road signs, brake lights, and lane markings have to be legible at highway speeds, and the margin shrinks fast as acuity drops.
Acuity Standards for a Regular License
The 20/40 standard is remarkably consistent across states. Whether you apply in the Northeast, the Sun Belt, or the Pacific Northwest, licensing agencies almost universally use 20/40 as the cutoff for driving without restrictions. You can meet it in one eye or both, and corrective lenses count toward the score.
Below 20/40, rules diverge. Many states issue a restricted license if your corrected vision falls between 20/40 and 20/70 in your better eye. Some will license down to 20/100 with significant restrictions. At 20/200, the door closes almost everywhere.
Drivers with vision in only one eye face the same 20/40 bar in their working eye. The bigger challenge for them is lost depth perception and a narrower field of view. Most states will license a monocular driver who meets the acuity standard, though some require an adjustment period of 60 to 90 days after the loss of an eye before issuing a full license.
Field of Vision
Acuity is sharpness. Field of vision is breadth: how wide an area you can see while looking straight ahead. It’s what lets you catch a car merging from the left or a pedestrian stepping off the curb to your right without turning your head.
State requirements for horizontal field range from about 70 degrees up to 140 degrees, depending on license type and whether the measurement is per eye or combined. A common benchmark for an unrestricted regular license is roughly 110 degrees of combined horizontal vision. Drivers with narrower fields may qualify for a restricted license at thresholds as low as 70 degrees combined, usually with daylight-only or low-speed conditions attached.
Conditions like glaucoma, retinitis pigmentosa, and stroke-related damage can shrink peripheral vision without affecting central sharpness. That’s why screening tests both dimensions separately. You can read the chart cleanly and still fail the field test.
Color Vision
For a regular passenger license, color vision usually isn’t a barrier. A handful of states include it in their screening, but most do not formally test it or use it as grounds for denial. Traffic signals are designed with positional cues, red on top and green on bottom, that let colorblind drivers read them reliably.
Commercial drivers are a different matter, covered below.
What the Vision Screening Looks Like
When you apply for or renew a license, the DMV will ask you to look into an automated screening device or read letters off a wall-mounted chart. The machine displays rows of characters that get progressively smaller, and the smallest row you can read determines your score. Some offices also measure your peripheral field during the same screening.
If you pass wearing glasses or contacts, a corrective-lens restriction gets added to your license, and you’re legally required to wear them whenever you drive. Driving without them when your license requires them is treated like driving outside your license terms, and a citation can follow.
If you fail, the DMV won’t issue a license that day. You’ll be referred to a licensed optometrist or ophthalmologist for a full exam. The specialist completes an official vision report documenting your acuity, field, diagnosis, and whether lenses or other aids can bring you up to standard. You submit that report to the DMV, which decides whether to issue a full license, a restricted one, or deny the application. A behind-the-wheel road test is sometimes required to show you can compensate for a visual limitation.
Screening doesn’t end at your first license. Most states retest at every renewal, and many impose stricter or more frequent vision testing for older drivers, often blocking online renewal past a certain age so an in-person check is required.
When Glasses Aren’t Enough: Bioptic Telescopes
For people whose acuity can’t be corrected to 20/40 with standard lenses, bioptic telescopic systems offer another route. These are small telescopes mounted into the top of a pair of eyeglasses. You look through the regular lens most of the time and glance briefly through the telescope to read distant signs or spot hazards.
Around 37 states permit some form of bioptic driving, with rules that vary widely. Most require the carrier lens, meaning the regular glasses portion, to provide at least 20/100 acuity, with the telescope bringing distant vision to 20/40 or 20/70 depending on the state. Specialized behind-the-wheel training and a separate road test are almost always required before a bioptic license is granted.
Common Restrictions on a Limited-Vision License
Drivers who clear the minimum but fall short of the unrestricted standard typically receive a license with one or more conditions:
- Daylight only, meaning driving is limited to the period between sunrise and sunset. This is the most frequent restriction for borderline acuity or reduced contrast sensitivity.
- No freeway or highway driving, keeping the driver off high-speed roads where quick reactions and long-distance visibility matter most.
- A geographic radius that limits driving to a set distance from home, sometimes tied to specific destinations.
- A speed cap, sometimes as low as 45 mph.
- Additional mirrors, such as wide-angle, panoramic, or fender-mounted mirrors, to compensate for peripheral loss.
These restrictions are printed or coded directly on the license. Violating them is a traffic offense, and a citation can also trigger a DMV review of your driving privileges.
Commercial Drivers Have Higher Standards
If you drive a commercial motor vehicle across state lines, federal rules from the Federal Motor Carrier Safety Administration apply instead of your state’s standards. You need at least 20/40 acuity in each eye individually, 20/40 binocular acuity with both eyes together, a field of vision of at least 70 degrees in the horizontal meridian in each eye, and the ability to recognize standard red, green, and amber traffic signal colors.1eCFR. 49 CFR 391.41 – Physical Qualifications for Drivers
Commercial standards historically disqualified anyone who couldn’t meet the acuity or field requirement in their worse eye. A 2022 final rule replaced the old vision exemption program with an alternative qualification pathway. A driver who falls short in the worse eye can still qualify if an ophthalmologist or optometrist completes a Vision Evaluation Report (Form MCSA-5871), and a certified Medical Examiner conducts a physical qualification exam within 45 days of that report. Drivers qualified through this route must be re-examined and re-certified at least once a year.2Federal Motor Carrier Safety Administration. Vision Evaluation Report, Form MCSA-5871
What Happens if You Fail
Failing the DMV screening is not a permanent denial. You get a referral to an eye care specialist, who examines you and completes the state’s vision report form. If corrective lenses or treatment can bring your acuity and field within legal limits, you return the completed form to the DMV and may be cleared to retest.
If correction isn’t enough for an unrestricted license but your vision falls within the restricted range, the DMV will typically issue a conditional license, sometimes after a road test that confirms you can drive safely under the specific conditions attached.
If your vision falls below the minimum for any license, the application is denied. In most states, you can request an administrative hearing to challenge the decision, usually by submitting a written request within a set window, often 30 days, and presenting evidence from your eye doctor. Some states convene a medical advisory board of physicians who review the documentation and make a recommendation. The hearing lets you present a second opinion or updated results, but the medical evidence has to show you can actually operate a vehicle safely.
If Your Vision Changes Between Renewals
Most states rely on voluntary reporting when it comes to physicians notifying the DMV about a patient’s deteriorating vision. No state has a well-known mechanism requiring drivers themselves to proactively report vision changes between renewals, which means the practical checkpoint for most people is the screening at the next renewal.
Many drivers with gradually worsening vision from cataracts, macular degeneration, or diabetic retinopathy keep driving until that screening catches the decline. If you know your vision has dropped below the legal threshold, continuing to drive creates both legal exposure and real safety risk. Get an eye exam and find out where you stand. An ophthalmologist who spots a correctable problem can often get you back within legal limits before you ever reach the DMV counter.