Missouri Revised Statutes Title XIX. Motor Vehicles, Watercraft and Aviation § 302.175. Vision requirements--examination--license may be issued with conditions, limitations, restrictions

1. The director shall not issue or renew a license to any applicant whose vision is not twenty-forty or better with either eye according to the test for vision provided in this section. Any person whose naked vision is less than twenty-forty with either or both eyes but whose vision in one eye has been corrected to twenty-forty or better by the use of corrective lenses may be issued a conditional license, conditioned that the person may operate a motor vehicle only when wearing corrective lenses which will correct his vision to meet the requirements of this section, which condition shall be noted on the license of the person and it is unlawful for the person to operate a motor vehicle upon any public highway of this state unless he is at the time complying with the condition. If a person whose naked vision is less than twenty-forty is unable to accomplish the correction of this condition by corrective lenses and produces a statement from a registered optometrist or physician to that effect, the director may conduct an examination to determine the person's ability to operate a motor vehicle upon the public highways of this state with safety in spite of his infirmity. If the director is satisfied that the person can operate a motor vehicle upon the public highways of this state with safety in spite of his vision infirmity, the director may issue him a license containing the conditions, limitations and restrictions as to points of operation and time of operation, or any other conditions, limitations or restrictions that the director deems advisable.

2. The vision examination shall be conducted with the use of the “Snellan Vision Chart” or other vision determining device of the same standard by any person to whom the director has delegated the duties without cost to the applicant, or, at the applicant's discretion, by a registered optometrist or physician at the applicant's expense and shall further include peripheral screening in accordance with standards presented by the director. All vision tests shall be made with not less than thirty foot candle illumination.