Most U.S. states require a visual acuity of at least 20/40 in your better eye to qualify for an unrestricted driver’s license. That means you need to see at 20 feet what a person with normal vision sees at 40 feet, with glasses or contacts if you wear them. A few states are more lenient, and commercial drivers face stricter standards.
The 20/40 Standard and State Variations
All 50 states set a minimum visual acuity for driving, and all but three use 20/40 in the better eye as the cutoff for a standard license. Georgia allows up to 20/60, while New Jersey and Wyoming set their threshold at 20/50. These are “best corrected” standards, meaning you can wear glasses or contact lenses during the test and while driving.
If your vision falls below the standard but isn’t disqualifying, most states will issue a restricted license rather than deny you outright. Common restrictions include daytime-only driving, no freeway driving, limits on how far from home you can drive, and requirements for extra mirrors. If you need corrective lenses to pass, your license will carry a lens restriction (marked “B” in many states), and driving without your glasses or contacts becomes a citable offense.
Peripheral Vision Requirements
Visual acuity is only part of the picture. You also need adequate peripheral vision to detect vehicles, pedestrians, and obstacles approaching from the side. Federal standards for commercial drivers require at least 70 degrees of horizontal field of vision in each eye. For regular passenger licenses, states set their own thresholds. Florida, for example, requires 130 degrees of uninterrupted horizontal field of vision. If you fall short, you’ll typically need to submit detailed visual field testing from an eye specialist before a licensing decision is made.
Driving With Vision in One Eye
Having sight in only one eye does not automatically disqualify you from driving, but the requirements shift. In Florida, if one eye is blind or worse than 20/200, the other eye must be at least 20/40. Many states apply a similar principle: the functioning eye needs to meet a higher acuity bar than what’s normally required when both eyes work together.
Peripheral vision becomes a bigger concern with monocular vision since depth perception and side awareness are reduced. Some states require wider mirrors or restrict highway driving. Federal regulations for commercial vehicles were updated in 2022 to create an alternative vision standard, allowing drivers who don’t meet the usual requirements in their worse eye to qualify if they pass the new criteria. That alternative standard has been in effect since March 2023.
Bioptic and Telescopic Lenses
If your vision can’t reach 20/40 with standard glasses, some states allow you to drive using bioptic telescopic lenses, small mounted telescopes attached to regular eyeglasses. Pennsylvania is one of about 40 states that permit bioptic driving, though with conditions. Applicants there must show 120 degrees of horizontal visual field, own the bioptic system for at least three months before applying, and have a full eye exam documented by a specialist.
In Pennsylvania, if your corrected acuity through the bioptics is worse than 20/50, you’re limited to daytime driving. If it’s better than 20/40, you can apply for nighttime privileges after one year. States that allow bioptic driving generally require a training period and may mandate a road test specifically with the lenses in use. In New York, a telescopic lens restriction is placed directly on your license.
Color Vision and Night Vision
The U.S. does not require color vision testing for a standard driver’s license, and color blindness alone won’t prevent you from getting one. This is consistent with the approach in most Western countries. A European Commission working group reviewed the evidence and found no strong justification for including color vision in driving requirements. The reasoning is straightforward: traffic signals use position (top, middle, bottom) in addition to color, and most color-deficient drivers adapt without difficulty.
That said, some countries take a harder line. Eight of ten Southeast Asian nations surveyed deny licenses to individuals with any color vision impairment. There’s a narrow exception worth noting: people with protanopia, a specific type of red-blindness, may have slower reaction times to brake lights, which has led some jurisdictions to consider restrictions for commercial licenses on a case-by-case basis.
Night vision is handled differently. If an eye care professional determines your vision is significantly impaired in low light, a “daylight driving only” restriction can be added to your license. This is a clinical judgment rather than a pass-fail screening test at the DMV.
Commercial Driver Requirements
Interstate commercial drivers (those with a CDL) face a higher bar set by the Federal Motor Carrier Safety Administration. The standard requires at least 20/40 acuity in each eye individually, not just the better eye. Commercial drivers also need a minimum 70-degree horizontal field of vision in each eye and must be able to distinguish the colors of traffic signals. These are tested during the DOT physical exam, which must be renewed on a regular schedule.
How the Vision Test Works
When you apply for or renew a license, you’ll take a vision screening at the DMV office or submit results from an eye care provider. California, like many states, uses a standard Snellen wall chart, the familiar rows of letters that get progressively smaller. Some offices use machine-based screeners instead, where you look into a viewfinder and read letters or identify shapes.
If you fail the screening at the DMV, you’re not necessarily out of options. Most states allow you to visit an optometrist or ophthalmologist, get a corrected prescription, and submit a professional vision report. In New York, this is done through a specific form (the MV-619 for standard results or the MV-80L for cases requiring medical review). Submitting an outside eye exam can also let you renew your license online or by mail instead of visiting the DMV in person.
Renewal Testing and Age
Vision is retested every time you renew your license. In New York, that cycle is every eight years, with the option to renew up to a year early. Some states shorten the renewal interval for older drivers or require in-person vision testing rather than allowing mail-in renewals after a certain age. There is no single national policy on age-based retesting, so your state’s DMV website is the best source for your specific renewal schedule.
UK Eyesight Rules
If you’re driving in the United Kingdom, the standard is different. You must be able to read a number plate from 20 meters away, roughly the length of five parked cars. The formal acuity requirement is 6/12 on the Snellen scale (equivalent to about 20/40 in the U.S. system), measured with both eyes together or with your one functioning eye if you have monocular vision. Unlike in the U.S., there’s no machine-based screening at a testing center. The number plate reading test is conducted at the start of your practical driving exam, and failing it means the test doesn’t proceed.