optical

/'ɔptikəl/
Adjective
  1. of or relating to or resembling the eye
    • ocular muscles
    • an ocular organ
    • ocular diseases
    • the optic (or optical) axis of the eye
    • an ocular spot is a pigmented organ or part believed to be sensitive to light
  2. relating to or using sight
    • ocular inspection
    • an optical illusion
    • visual powers
    • visual navigation
  3. of or relating to or involving light or optics
    • optical supplies

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optical
The scientist adjusts the optical lens on the microscope.