In most states, the vision requirements for driving a standard passenger vehicle are at least 20/40 corrected acuity in your better eye, plus a minimum peripheral field of view. If you hit those marks with glasses or contacts, you pass. If you fall short, you may still qualify with restrictions, a specialist’s evaluation, or specialized equipment.
The 20/40 Acuity Standard
Nearly every state uses 20/40 in the better eye as the cutoff for an unrestricted license. The number comes from the Snellen scale: the top figure is your testing distance of 20 feet, and the bottom figure is the distance at which a person with standard vision could read the same line. So 20/40 means the smallest letters you can read at 20 feet would be legible to someone with normal sight from 40 feet away, roughly half of normal sharpness.
A few states tweak the standard. Some allow 20/50 with restrictions. Others require 20/40 in both eyes rather than just the better one.
If your acuity lands between 20/40 and 20/70, many states will still issue a license, but with conditions attached. Below 20/70, eligibility drops off quickly. Some states set an absolute floor at 20/100 or 20/200 in the better eye, beyond which no standard license is available regardless of corrective lenses.
Peripheral Field of Vision
Sharpness is only half the test. States that specify a minimum horizontal field of vision set thresholds anywhere from 90 to 170 degrees, with many falling in the 110-to-140-degree range. The reasoning is practical: if you can’t see enough of the road to your left and right while looking straight ahead, lane changes, intersections, and merging traffic become genuinely dangerous.
For drivers with vision in both eyes, a common requirement is around 120 to 140 degrees of combined horizontal field. Drivers with useful vision in only one eye face adjusted standards, often requiring around 70 degrees temporally in the functioning eye. Not every state sets a numeric field minimum. Some leave the call to examiner discretion or a physician evaluation.
What the Vision Screening Involves
Screening happens when you first apply and again at renewal. Most DMV offices use a traditional Snellen chart or an electronic screening device that simulates viewing distances. The examiner asks you to read specific lines with one eye covered, then the other, and finally with both eyes open.
If you fail the in-office screening, you aren’t denied on the spot. The examiner hands you a form to take to an optometrist or ophthalmologist. The eye specialist records your corrected acuity, field-of-vision measurements, and any diagnosed conditions, and you bring the completed form back. The agency then decides whether to issue an unrestricted license, a restricted license, or deny the application.
Most borderline applicants end up in that specialist loop, and many walk away with a license. Sometimes the license carries restrictions, but it’s a license.
License Restrictions You Might Receive
If you need glasses or contacts to reach 20/40, your license will carry a corrective lens restriction. The code varies by state, often labeled “Restriction B.” Driving without your corrective lenses when the restriction appears on your license is a traffic violation. Fines commonly range from a couple hundred dollars up to $500, and at least one state treats it as a misdemeanor.
Depending on your results, a state may also impose:
- Daylight-only driving, applied when corrected acuity falls in a borderline range (often between 20/40 and 20/50) or when you have documented difficulty with low-light conditions.
- Speed or road-type limits. Some states cap your speed at 45 mph or prohibit freeway travel if your vision is significantly reduced.
- Outside mirror requirements, common for drivers with limited vision in one eye.
- A geographic radius, in rare cases restricting driving to a certain distance from home.
Restrictions are the state’s way of keeping you mobile within what’s considered reasonably safe.
Driving With Vision in Only One Eye
You can get a driver license with vision in only one eye in every state. Most require your functioning eye to meet or exceed the standard acuity threshold, typically 20/40, and impose restrictions like outside mirrors on both sides of the vehicle. Some states also require a wider-than-normal field of vision in the remaining eye, commonly at least 70 degrees temporally.
Depth perception is the real-world challenge. Judging distance while parking, merging, or navigating tight spaces takes more conscious effort with one eye. Some states require a waiting period, often several months, after losing vision in an eye before you’re eligible to test, giving your brain time to adapt to monocular depth cues.
Color Vision
Color blindness does not disqualify you from a standard driver license. No state bars colorblind drivers outright. Some states test your ability to distinguish red, amber, and green during the screening, but failing that portion doesn’t automatically end the process. You may be referred for additional evaluation or asked to demonstrate that you can identify traffic signals by position (red on top, green on the bottom) rather than by color.
Commercial Driver Standards Are Stricter
If you’re after a commercial license, the bar is higher. Under federal physical qualification rules, a commercial driver must have at least 20/40 acuity in each eye individually, plus 20/40 binocular acuity, at least 70 degrees of horizontal field 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
A 2022 federal rule replaced the old vision exemption program with an alternative vision standard. Drivers who meet the acuity and field requirements in their better eye can now be physically qualified by a medical examiner, provided the worse eye meets certain minimum thresholds.2eCFR. 49 CFR 391.44 – Physical Qualification Standards for Individuals Not Meeting Vision Standard A commercial driver who genuinely cannot distinguish red, green, and amber signals may be disqualified from interstate operation, a stricter outcome than applies to standard-license holders.
Bioptic Telescopic Lenses for Low Vision
About 37 states allow some form of driving with bioptic telescopic lenses, small mounted telescopes attached to regular glasses that you tilt your head to look through for distance tasks like reading signs. Rules vary widely. Some states let you use bioptics to pass the acuity screening. Others permit driving with them but not using them during the test. A few require specialized behind-the-wheel training and road testing before issuing a bioptic-restricted license.
If you have low vision and are considering this route, contact your state’s licensing agency to confirm the specific requirements before investing in equipment or training. What qualifies you in one state may not transfer to another.
Retesting as You Age
Many states require more frequent vision testing as drivers age. Some begin mandating a vision test at every renewal starting around age 62 to 65. Others wait until 70, 75, or 80. Several shorten the renewal cycle for older drivers from the standard four-to-eight years down to two or three, which effectively forces more frequent screenings.
Age-related conditions like cataracts, macular degeneration, and glaucoma can erode vision gradually enough that you may not notice the decline until you’re below the legal threshold. If you’re approaching one of these age milestones, a comprehensive eye exam before your renewal appointment can save you a failed screening and a return trip with specialist paperwork.
Reporting Vision Changes Between Renewals
Once you have a license, you don’t get to ignore vision changes until your next renewal. Drivers are expected to report conditions that could affect their ability to drive safely, though enforcement of this self-reporting duty is inconsistent and most people don’t voluntarily notify the DMV.
Physician reporting is limited. Only about six states require doctors to notify the licensing authority when a patient’s vision or other medical condition drops below safe driving thresholds. Oregon and Pennsylvania are among those that specifically mandate reporting for significant visual acuity and field-of-vision loss. In the remaining states, physician reporting is voluntary.
When a licensing agency does learn about a vision problem, whether through a physician report, a police referral, or a family member’s concern, it can initiate a medical review. That process typically involves updated medical documentation or a new vision screening. Outcomes range from keeping your unrestricted license, to adding restrictions, to suspension until your condition improves.