The DMV eye chart is a visual acuity test scored on the Snellen scale, and in almost every state you pass a regular noncommercial license screening by reading at 20/40 or better in at least one eye, with glasses or contacts if you need them. The chart itself is not standardized across the country. What you look at, whether it hangs on a wall or lives inside a machine, and exactly how well you have to see all depend on which state and sometimes which office you walk into.
What You’ll Actually Look At
The mental image of a poster with shrinking rows of letters is a little outdated. Many DMV offices now use automated vision screening machines instead of a traditional wall chart. The Optec 1000, one of the most widely adopted models, has been installed in over 18,000 driver’s license facilities. You look into an eyepiece and read letters, identify shapes, or respond to light patterns inside the device. The machine can test acuity in each eye separately, both eyes together, and sometimes peripheral vision and color recognition in a single sitting.
Other offices still use a wall-mounted Snellen chart or a projected version of one. That’s the familiar layout: rows of capital letters starting large at the top and getting progressively smaller. You stand about 20 feet away, or a calibrated equivalent for smaller rooms, and read the smallest line you can make out clearly. Wall or machine, the scoring uses the same Snellen scale.
Charts for People Who Can’t Read Standard Letters
The classic Snellen chart with random capital letters is by far the most common format, but DMVs keep alternatives on hand. The Tumbling E chart replaces letters with the letter “E” rotated in different directions. Instead of reading aloud, you point or say which way the open end faces: up, down, left, or right. It works well for anyone who can’t read the Latin alphabet or has trouble with letter recognition.
Some machine-based screeners display symbols, numbers, or directional arrows instead of letters. A few states also test near vision using reading-distance text blocks, though that’s uncommon for a standard license. The specific chart loaded into the machine depends on what your state’s motor vehicle agency purchased, which is one reason the experience feels different from one DMV to another.
The 20/40 Standard and What It Means
Nearly every state sets the minimum at 20/40 corrected visual acuity in the better eye for an unrestricted noncommercial license. With glasses or contacts on, you need to see at 20 feet what someone with textbook vision sees at 40 feet. There are no federal standards for regular passenger-vehicle licenses. Each state sets its own threshold, and they’ve converged on 20/40 almost universally.
If you need corrective lenses to hit 20/40, the DMV adds a restriction code to your license, often code “B,” indicating you must wear glasses or contacts while driving. Getting pulled over without them is a traffic violation, and in some states it can void your insurance coverage for an accident.
Restricted Licenses for Borderline Vision
A handful of states allow restricted licenses for drivers whose best corrected acuity falls below 20/40 but is no worse than 20/70. The restrictions typically limit you to daylight driving, familiar routes, lower speed roads, or some combination. Below 20/70, most states will not issue any license without further evaluation.
Daylight-only is the most common restriction in this range. The exact acuity that triggers it varies: some states impose it starting at 20/50, others not until 20/60 or 20/70. A few states set different thresholds depending on whether the reduced acuity is in one eye or both, and whether the condition is stable or progressive. The restriction means you cannot legally drive when headlights are required, which in many jurisdictions covers not just nighttime but also dusk, dawn, fog, and heavy rain. Some states will remove the restriction after the driver completes specialized nighttime training with a certified rehabilitation specialist and gets clearance from a vision provider.
Drivers with functional vision in only one eye can get a regular license in every state as long as the working eye meets the acuity and field of vision standard. You’ll likely have a restriction noted on your license, and some states require an outside mirror on both sides of the vehicle.
Color Vision
For a regular passenger license, the vast majority of states do not test color vision at all. Color deficiency, including red-green color blindness, generally will not stop you from getting a standard license. Only about a quarter of U.S. states have any color vision requirement for drivers, and those that do mostly apply the rule only to commercial applicants. If your state does screen for it, the test is usually built into the vision machine and involves identifying colored lights or plates rather than a standalone Ishihara chart.
What Happens if You Fail
Failing the screening isn’t the end of the road. In every state, you’ll be directed to see an eye care professional for a full examination. The DMV will give you, or your doctor, a specific form to complete. Your ophthalmologist or optometrist examines your acuity, visual field, and sometimes glare recovery and night vision, then certifies on the form whether you meet the minimum standard with or without correction.
You submit the completed form back to the DMV. No license is issued or renewed until the agency reviews it and confirms your vision is adequate. If the form shows you meet the standard with corrective lenses, you’ll get your license with a corrective lens restriction. If your corrected acuity lands in the restricted range, the DMV may issue a limited license with daylight-only or geographic conditions.
When vision falls well below the restricted range, the DMV may require a behind-the-wheel driving test or a specialized driving performance evaluation to see whether you can compensate. If you can’t pass, or if your acuity is 20/200 or worse, most states will not schedule a road test at all and will deny or revoke the license.
One Note on Retesting
How often you face the chart again depends on your state. Some require a vision screening at every in-person renewal. Others never retest after the initial license unless a medical review is triggered. Online and mail-in renewals typically skip the vision test entirely, since there’s no way to administer it remotely. Roughly 19 states require more frequent screening once drivers reach a certain age, with thresholds ranging from the 40s into the 70s.1FHWA. Supplemental Technical Notes – FHWA-RD-01-051 If you renew online during a cycle that doesn’t require screening, your vision goes unchecked for the entire renewal period, which is worth thinking about if your eyesight has changed since your last office visit.
How to Prepare Before You Go
The single most effective thing you can do is visit your eye doctor before the DMV, not after you fail. If your prescription has changed, update it first. Bring your current glasses, or wear your contacts to the office. If you typically wear contacts, don’t switch to an old pair of glasses just for the test.
Rest matters more than people expect. Eye fatigue from staring at screens all day can temporarily reduce your measured acuity. Schedule your DMV visit for a time when your eyes aren’t exhausted if you can. Arrive hydrated, since dry eyes blur vision, especially with contacts in.
If you know your vision is borderline, ask your eye doctor what your corrected acuity actually measures. Sitting at exactly 20/40 leaves you zero margin. Your doctor can tell you whether a prescription tweak might give you a comfortable buffer, or whether you should expect restrictions on your license and plan accordingly.