title: Thickness measurement of hydrogel lenses.
abstract: The thickness of hydrogel lenses was measured in air with a Radiuscope and in saline with a specular microscope. The measurements are in good agreement, showing that drying is not a problem with air measurement. With a simple modification to the Radiuscope, the thickness measured is satisfactory for calculating optical power and oxygen transmissibility.
mesh_terms: D002138:Calibration / Q000592:standards; D003263:Contact Lenses, Hydrophilic / Q000592:standards*; D006801:Humans; D008853:Microscopy / Q000295:instrumentation / Q000379:methods; D055095:Optics and Photonics; D010100:Oxygen; D010539:Permeability
chemical_list: D010100:Oxygen