What to Expect From the DMV Eye Exam Chart

What the DMV eye exam chart measures

The DMV eye exam chart tests your visual acuity — how clearly you can see letters and symbols at a standard distance. The examiner will have you read lines of progressively smaller text from a chart mounted on the wall, usually from 20 feet away. Your score comes out as a fraction like 20/40 or 20/20, which tells the DMV whether your vision meets the minimum standard to drive safely in your state.

The chart itself is typically the Snellen chart, named after the Dutch ophthalmologist who designed it in 1862. It has 11 rows of letters, with the largest letters at the top and the smallest at the bottom. You read from top to bottom until you can no longer make out the letters clearly. The examiner notes which row you stop at, and that determines your acuity score.

This is not the same as an eye health exam. The DMV chart does not check for color blindness, depth perception, peripheral vision, or eye disease. It measures one thing: whether you can see detail clearly enough to read road signs and spot hazards at driving distance.

Key Takeaways

The DMV eye exam chart tests how clearly you can see letters from 20 feet away, using a Snellen chart with 11 rows of progressively smaller text.
Your vision score is expressed as a fraction — 20/20 means you see at 20 feet what a person with standard vision sees at 20 feet, and 20/40 means you need to be at 20 feet to see what others see at 40 feet.
Most states require a minimum of 20/40 vision in at least one eye to drive, though some require 20/30 or better, and a few allow 20/50 with restrictions.
You can wear glasses or contact lenses during the DMV eye exam, and your score will reflect your vision while wearing them.
If you fail the chart, you can usually retake it the same day or schedule another appointment, and you may be asked to see an eye doctor for a full exam.

How the vision score is calculated

The fraction in your vision score has a specific meaning. The top number is always 20, representing the distance in feet from the chart. The bottom number is the distance at which a person with standard vision could read the same line of letters. So 20/20 means you can read at 20 feet what a person with standard vision reads at 20 feet. A score of 20/40 means you need to be at 20 feet to read what someone with standard vision can read from 40 feet away — your vision is half as sharp.

The examiner marks your score based on the smallest line you can read with at least half the letters correct. If you can read most of the 20/30 line but only a few letters on the 20/20 line, your score is 20/30. You do not have to read every letter perfectly on a line to count it — the examiner allows a small number of mistakes.

If you wear glasses or contacts, the DMV tests your vision while wearing them. Your corrected vision score is what matters for the license. If you can see 20/20 with glasses but only 20/60 without them, your license will be valid, but you may be required to wear corrective lenses while driving.

Minimum vision requirements by state

Vision standards vary by state and sometimes by license type. Most states require a minimum of 20/40 in at least one eye. Some states are stricter and require 20/30 or better. A few states allow 20/50 vision, usually with restrictions such as daytime driving only or a note on the license that corrective lenses are required.

A handful of states also test peripheral vision — how much you can see to the side without moving your eyes — though this is less common. If you have vision in only one eye, some states have separate rules and may require a special test or a restricted license.

You can find your state's specific requirement on your state DMV website or by calling your local DMV office. The standard is not the same everywhere, so knowing your state's threshold before you take the test helps you understand whether you are likely to pass.

What happens if you fail the eye exam

If your vision score falls below your state's minimum, you will not pass the eye exam portion of the vision test. The DMV will not issue or renew your license until your vision meets the standard. You typically have the option to retake the chart test the same day, though some offices require you to schedule a new appointment.

Many states will ask you to bring a letter from an eye doctor stating that your vision can be corrected to the required level. This gives you a path forward: get glasses or contacts, have your eye doctor document the corrected vision, and return to the DMV with that letter. Some states will accept the eye doctor's letter in place of retaking the DMV chart.

If you fail the chart test twice, the DMV may require a full eye exam from an optometrist or ophthalmologist before you can test again. This is to rule out an eye condition that needs treatment. The eye doctor's report goes to the DMV, and you can then retake the vision test.

Preparing for the DMV eye exam chart

If you wear glasses or contacts, bring them with you to the DMV. The test is designed to measure your vision as you actually use it to drive. If you have recently changed your prescription, wear your current glasses or contacts — do not wear an old pair. If you are unsure whether your prescription is current, have your eye doctor check it before your DMV appointment.

If you do not wear corrective lenses but have noticed that road signs are harder to read lately, consider scheduling an eye exam before your DMV visit. You may have developed a vision problem that is easily corrected. An eye doctor can give you a letter stating your corrected vision if you need one for the DMV.

On the day of the test, make sure you are well-rested and not tired or stressed. Fatigue can affect how clearly you see the chart. Arrive early so you have time to adjust to the lighting in the DMV office before the examiner calls you.

The difference between the DMV chart and a full eye exam

The DMV eye exam chart is a screening tool, not a medical exam. It tests only visual acuity — the sharpness of your central vision. A full eye exam by an optometrist or ophthalmologist includes tests for color vision, depth perception, peripheral vision, eye pressure, eye health, and the presence of disease. The DMV chart does none of these things.

If you fail the DMV chart or if the examiner suspects an eye problem, you will be referred to an eye doctor for a full exam. That exam can catch conditions like glaucoma, cataracts, macular degeneration, or diabetic retinopathy — problems that the DMV chart cannot detect. These conditions can affect your ability to drive safely even if your central vision is sharp.

For your own health and safety, it is worth having a full eye exam every one to two years, separate from your DMV vision test. An eye doctor can catch problems early and help you maintain the vision you need to drive.

What to know about vision restrictions on your license

If you pass the DMV eye exam but only barely, or if you have vision in only one eye, your license may come with a restriction. Common restrictions include "corrective lenses required" (you must wear your glasses or contacts while driving), "daylight driving only" (you cannot drive at night), or "no highway driving" (you are limited to local roads).

These restrictions are printed on your license and are legally binding. Driving without following them can result in a ticket and points on your record. If your vision changes or your prescription needs updating, you may be able to have the restriction removed by passing a new vision test or providing a letter from your eye doctor.

If you disagree with a restriction placed on your license, you can request a hearing with the DMV. You will need to bring documentation from an eye doctor showing that you meet the standard for unrestricted driving.

Frequently Asked Questions

Can I wear my glasses or contacts during the DMV eye exam?

Yes. The DMV tests your vision as you actually use it to drive. If you wear glasses or contacts, wear them to the test. Your score will reflect your corrected vision, and that is what matters for your license.

What does 20/40 vision mean?

It means you need to be at 20 feet to see clearly what a person with standard vision can see from 40 feet away. Your vision is half as sharp as the standard. Most states allow 20/40 vision for driving, though some require better.

What if I can only see out of one eye?

Some states have separate rules for monocular vision. You may still be able to get a license, but it might come with restrictions or require a special test. Contact your state DMV to learn the rules for your situation.

Do I need a full eye exam before the DMV vision test?

No, the DMV does not require it. But if you have not had your eyes checked recently and you are worried about passing, an eye exam beforehand can tell you whether you need new glasses or contacts.

Can I retake the eye chart test if I fail?

Usually yes, the same day or by scheduling another appointment. If you fail twice, the DMV may require a letter from an eye doctor before you can test again.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.