Paresis

A partial loss of voluntary muscle movement, distinguished from full paralysis (plegia). Paresis can affect a single limb (monoparesis), one side of the body (hemiparesis), or all four limbs (tetraparesis), and may result from stroke, cerebral palsy, spinal cord injury, or neurological disease. For digital accessibility, paresis typically means reduced strength, range, precision, or endurance of input — affecting use of keyboards, mice, touchscreens, and game controllers and often calling for alternative input hardware, remapping, or shared-control strategies.