It is an instrument used to measure the strength of spectacle lenses (and sometimes contact lenses), including the strength of the spherical and cylindrical correction, the axis and possibly the prism.
quickly and accurately measures the basic strength of your eyes (nearsightedness, farsightedness and astigmatism), often as the first step in an eye examination.
- Autorefractor-keratometer: A device that automatically measures the refraction (strength of the eye) and the curvature of the cornea (keratometry).
- Tonometer: An instrument that measures eye pressure, essential for the detection of glaucoma.
- Pachymeter: A device that measures the thickness of the cornea, important in evaluating eye pressure and prior to certain surgical procedures such as LASIK.
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