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  • Ophthalmic measuring instruments designed to determine the thickness of the cornea. The instruments may consist of contact devices using ultrasonic technology that generate pulses and measure the time differences of the echoes or of noncontact devices that use an optical technology that includes a microscope with a light source to generate slit images and an alignment component to adjust and measure the light reflection from the cornea. Other instruments use a dedicated camera system with image processing software to image, measure, and analyze the anterior part of the eye. Pachymeters are used mainly to detect glaucoma or for planning refractive surgery.
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