Depending on the core body temperature the effects will vary but you are on point when you question the effects to vision, mental judgement and other motor skills. Severe Hypothermia sets in at
90º - 86ºF w/ Shivering stops, exposed skin blue of
puffy, muscle coordination very poor, inability to
walk, confusion, incoherent/irrational behavior, but
may be able to maintain posture and appearance of
awareness
86º - 82ºF Muscle rigidity, semiconscious, stupor,
loss of awareness of others, pulse and respiration
rate decrease, possible heart fibrillation
82º - 78ºF Unconscious, heart beat and respiration
erractic, pulse may not be palpable
78º - 75ºF Pulmonary edema, cardiac and respiratory
failure,death. Death may occur before this temperature
is reached.
At 32 degrees the average heathy non intoxicated
person will go into the 78 -75F range in 5 -10 minutes
depending on health condition, body fat amount present
and layers of clothing worn and type. (multiple layers
of wool are the best) after that they are dead.