The Department of Motor Vehicles' eye chart test contains five lines of letters in decreasing letter sizes that an aspiring driver must read with both eyes open, then with each individual eye. A candidate must meet the standard of 20/40 prescribed by the department to obtain or renew a license.
The Snellen visual acuity test, which the Department of Motor Vehicle uses, consists of lines of letters that decrease uniformly by 25 percent from top to bottom. If a driver cannot read the letters on the chart, he has to look into a vision-tester and identify specific objects. If a driver cannot meet the minimum vision standards without the help of contact lenses or glasses, the department places a "B" restriction on his learner permit or driver's license.