Related Experiment Video
Updated: Aug 15, 2026

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
Published on: January 15, 2016
Visual characteristics of Missouri State Highway Patrol troopers
1University of Missouri-St. Louis, School of Optometry 63121-4400.
Background:
The Missouri State Highway Patrol (MSHP) had 902 troopers on duty at the time of this study. The purpose of this study was to determine, for the first time, the visual characteristics of this group.
Methods:
All 902 troopers were requested to be screened during early 1993 at their local MSHP troop headquarters. Vision screening was done by Department of Motor Vehicle Personnel using Keystone/Mast DVS II Driver Vision Screeners. The results, along with current prescriptions obtained from their eye care practitioners, were mailed to the author.
Results:
A 94 percent response rate was achieved. The group's mean age was 38.7 years and most (98 percent) were male. Forty-seven percent wear an optical correction either some or all of the time and these were evenly divided between single vision and multifocal corrections. Seventy-four percent of eyes had uncorrected distance acuity of 20/20 increasing to 94 percent of eyes with 20/20 when corrections were worn.
Conclusions:
The results of this study will be used as a basis to update MSHP vision standards for acquisition and retention of troopers.
Related Concept Videos
Motor Units
Rolling Resistance
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
Motor Units
Motor units come in different sizes, with smaller units...
Masonry in Cold and Hot Weather Conditions
Other key practices include keeping masonry units and sand dry and...
Streamlines, Streaklines, and Pathlines
Field Procedure for Staking Out Curves

