The Collaborative International Dictionary of English v.0.48:

Optometrist \Op*tom"e*trist\, n.
   One who is skilled in or practices optometry, especially one
   who examines the eyes for defects in vision and prescribes
   the proper lenses to correct any defects discovered.
   [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

optometrist
    n 1: a person skilled in testing for defects of vision in order
         to prescribe corrective glasses [syn: optometrist,
         oculist]