How to Measure an Axis for Eye Glasses

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Without the right vision equipment, it may be hard to tell if eye glasses have been improperly calibrated. Eye glass lenses are measured by four major optical properties: the axis, sphere, cylinder and focus values. The axis values measure the required amount of rotation needed for a person with an astigmatism. Astigmatism can be corrected by adjusting the axis of your eye glass lenses to eliminate headaches or distorted vision at near-sighted or far-sighted distances.

Things You'll Need

  • Lensometer
  • Mount the eye glasses against the base of the lensometer platform.

  • Center one of the lenses in the optical viewfinder of the lensometer. The axis is measured by criss-crossing narrow lines that will become parallel when the axis are aligned. Begin turning the axis knob to make the viewfinder's lines parallel.

  • Measure the readings on the axis knob. The measurement value represents the axis for the eye glasses. Repeat steps 1 to 3 to find the axis for the other lens.

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References

  • Photo Credit eye glasses image by Alexandr Shebanov from Fotolia.com
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