R 257.4 Denial or suspension of drivers' licenses.

Rule 4. A driver's license must be denied or suspended indefinitely if an applicant or licensee has visual acuity less than 20/60 with recognizable progressive abnormalities affecting vision; visual acuity less than 20/70 without recognizable progressive abnormalities affecting vision; visual acuity of 20/100 or less in 1 eye and less than 20/50 in the other; or an unaided peripheral field of vision less than 90 degrees.