<prompt> Pachymeter is used to measureCorneal thicknessCorneal diameterCorneal densityConjuctival thickness  <response>: A pachymeter is a medical device used to measure the thickness of the eyes cornea. It is used to perform corneal pachymetry prior to refractive surgery, for Keratoconus screening, LRI surgery and is useful in screening for patients suspected of developing glaucoma among other uses. Ref khurana 6e 