Visual Acuity: Required for depth perception, color perception, preparing and analyzing written or computer data, visual inspection involving small defects and/or small parts, use of measuring devices, operation of motor vehicles or equipment, determining the accuracy and thoroughness of work, and observing general surroundings and activities. Additionally, the following physical abilities are required: Balancing: Maintaining body equilibrium to prevent falling while walking, standing, or crouching on narrow, slippery, or erratically moving surfaces.