The vision test — Missouri Permit Test
The vision test on the Missouri permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.
The rules
The Missouri vision test checks both acuity and peripheral vision, and is taken for any new or renewal license or permit.
Seeing clearly straight ahead is only half of it. A car coming from the side has to register too.
You must take an acuity vision test and a peripheral (side) vision test when you apply for any new or renewal driver license or permit.
The standard minimum acuity for a Missouri license is at least 20/40 with either or both eyes.
Twenty-forty is the line between reading a sign in time and reading it too late.
The standard minimum acuity is at least 20/40 with either or both eyes.
The standard minimum peripheral reading is at least 55 degrees in each eye, or 85 degrees in one eye.
Side vision is what catches the child stepping off the curb. The one-eye figure is higher because there is no second eye to help.
The standard minimum peripheral reading is at least 55 degrees in each eye or 85 degrees in one eye.
If both your natural and corrected acuity are worse than 20/160, or your combined peripheral is worse than 70 degrees, you cannot take the driving test and cannot hold a license.
There is a floor below which glasses cannot help enough. The state names it rather than leaving it to the examiner.
If both your natural and corrected acuity vision are worse than 20/160, or your peripheral combined is worse than 70 degrees, you cannot take the driving test and cannot have a driver license.
If you fail the standard vision test the examiner gives you a form for your eye specialist or physician to fill out.
A failed screening is not a refusal. It is a referral, and the specialist gets the last word.
If you fail the standard vision test, the examiner will give you a vision exam form that your eye specialist or physician must fill out.
On the test
What two things does the Missouri vision test measure?
Acuity and peripheral vision. Seeing clearly straight ahead is only half of it. A car coming from the side has to register too. Missouri Driver Guide, p.18: “You must take an acuity vision test and a peripheral (side) vision test when you apply for any new or renewal driver license or permit.”
How this works
Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.
You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.
Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.
What it costs
- One payment, once — not a subscription. Nothing renews and there is nothing to cancel, for an exam you sit one time.
- Free to start: a 10-question test and the first section of cards. No sign-up and no account.
- Paying opens the rest of the cards, unlimited full-length practice tests, and retests built from exactly the questions you got wrong.
- Every level up to Prepared — 3 tests passed in a row.
- Do the work, fail the real exam, and we refund you.
Where these come from
Every rule here is checked against Missouri Driver Guide, published by the Missouri Department of Revenue, and against the state code itself. Last checked 2026-09-16.
- src/assets/drivers-manuals/MO.pdf (Missouri Driver Guide, Revised August 2026, retrieved 2026-09-14)
- src/assets/drivers-manuals/MO.pages.txt (plain pdftotext over that PDF; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json (sha256, folio offset 2, folioMarker, nonLawPages and the extraction flag, each with its measured basis)