A vision test for driving is a short screening that checks whether you can see well enough to safely operate a vehicle. In nearly every U.S. state, you need at least 20/40 visual acuity in your better eye to qualify for an unrestricted license. The test is quick, usually taking less than a minute, but the consequences of failing it can affect your ability to get or keep your license.
What the Test Measures
The DMV vision screening evaluates two main things: how sharply you can see at a distance (visual acuity) and how wide your side vision extends (peripheral field of vision). Some states test both, while others focus primarily on acuity.
For visual acuity, you’ll read rows of letters or numbers at a simulated distance of 20 feet. The 20/40 standard used by nearly every state means you need to read at 20 feet what a person with normal vision could read at 40 feet. Only three states set a different bar: Georgia allows 20/60, while New Jersey and Wyoming require 20/50.
Peripheral vision requirements vary more widely. Connecticut and Arkansas require 140 degrees of horizontal field with both eyes open. Florida requires 130 degrees. States like Alabama, Iowa, Kansas, and Maine set the threshold at 110 degrees. Michigan has one of the lower requirements at 90 degrees. If you only have vision in one eye, most states lower the threshold but still require a minimum field, often around 100 to 105 degrees.
How the Screening Works
Most DMV offices use a machine called a vision screener rather than the classic wall chart you’d see at an eye doctor’s office. The Titmus vision screener is one of the most common models. You look into a viewfinder, similar to binoculars, and read lines of letters or identify symbols. The machine has built-in lighting and simulates the correct testing distance in a compact space, which makes it practical for busy licensing offices.
You’ll typically be asked to read with both eyes open, then with each eye individually. If you wear glasses or contact lenses, bring them. You’re allowed to use corrective lenses during the screening, and most people who need them will pass without any trouble.
What Happens if You Wear Glasses or Contacts
If you can only meet the 20/40 standard while wearing corrective lenses, your license will carry a restriction, usually coded as “Restriction B” or labeled “Corrective Lenses” on the back of the card. This means you are legally required to wear your glasses or contacts every time you drive. Getting pulled over without them is a traffic violation, just like driving without your license.
The restriction applies whether you use glasses, standard contacts, or specialty lenses. It stays on your license until you can demonstrate at a future renewal that your uncorrected vision meets the standard.
Color Vision and Standard Licenses
Color blindness does not prevent you from getting a regular driver’s license. No state requires color vision testing for a standard, non-commercial license. Traffic signals are designed with position cues (red on top, green on bottom) that allow color-deficient drivers to navigate safely.
Commercial driver’s licenses are a different story. Federal regulations require CDL holders to distinguish between red, green, and amber, since commercial drivers must identify signal lights, warning indicators, and hazard signs quickly across longer distances and in unfamiliar settings.
Commercial License Vision Standards
The Federal Motor Carrier Safety Administration sets stricter rules for anyone driving a commercial vehicle. You need 20/40 acuity in each eye individually, not just in your better eye. You also need at least 70 degrees of horizontal field vision in each eye and the ability to recognize standard traffic signal colors. These standards apply with or without corrective lenses, but both eyes must independently meet the threshold, which rules out some drivers who qualify for a regular license using only their stronger eye.
What Happens if You Fail
Failing the DMV vision screening doesn’t automatically mean you lose your driving privileges. In California, for example, drivers who fail are referred to an eye care professional who must examine them and complete a Report of Vision Examination form. The driver submits this form to the DMV for review.
From there, several things can happen. If the eye doctor’s report shows your vision meets the standard with correction, you’ll likely receive a license with a corrective lens restriction. If your vision falls below the standard, the DMV may schedule you for a driving evaluation to see whether you can compensate for the deficit in real-world conditions. These evaluations can cover 40 miles across different road types and traffic conditions.
If the evaluation shows you can drive safely with certain limitations, you may receive a restricted license that confines your driving to daytime hours, familiar routes, or lower-speed roads. If your performance raises serious safety concerns and your condition can’t be compensated for, the DMV can revoke your license. In cases where the condition might improve, a temporary restricted license or instruction permit may be issued to allow time for treatment or additional training.
Bioptic Telescopic Lenses
For people with low vision who fall below the standard 20/40 threshold, bioptic lenses offer a potential path to licensure in many states. These are small telescopes mounted on regular eyeglasses that let you briefly magnify distant objects like road signs while still using your normal peripheral vision for general driving. Most states that allow bioptic driving require a formal training program, which can involve around 90 hours of supervised practice over six weeks, followed by an extended driving evaluation. Some states permit bioptic licensure for drivers with acuity as low as 20/200, though thresholds vary.
Repeat Testing for Older Drivers
Many states require vision re-testing at renewal once you reach a certain age, since visual acuity and peripheral field naturally decline over time. The age triggers vary significantly. Maryland and Maine start requiring vision tests at renewal as early as age 40. Oregon begins at 50. Georgia and South Carolina set the threshold at 64 and 65, respectively. California requires in-person vision testing at 70. Florida waits until 80. Illinois requires both a vision test and a driving demonstration at age 75.
A few states apply vision testing requirements regardless of age. New Hampshire requires a visual acuity check for anyone renewing in person. New Jersey mandates a vision screening at least once every 10 years for all drivers. The trend across states is toward more frequent testing as drivers age, reflecting the reality that conditions like cataracts, glaucoma, and macular degeneration become more common in later decades and can change gradually enough that drivers may not notice the loss themselves.