An instrument for measuring thickness, as of the glass of a mirror, or of paper; a pachymeter.
                                                            
                                                     
                        
                                                
                        
                        
                            Instrument that uses optical principle of split images to measure corneal thickness or anterior chamber depth.
                                                            
                                                     
                        
                                                
                        
                        
                            a device that measures the thickness of the cornea with ultrasonic waves