Patent ID: 7798962
Filing Date: 2010-09-21
Classification: A61B

Abstract:
1. An ophthalmic instrument comprising: a fluid pump including a plenum chamber; a fluid discharge tube in communication with the pump for directing a fluid pulse at a cornea of a patient to cause reversible deformation of the cornea from an original state of convexity through a first state of applanation to a state of concavity, and back through a second state of applanation to the state of convexity; an applanation detector providing an applanation signal indicating a time of the first state of applanation and a time of the second state of applanation; a pressure sensor arranged to provide a pressure signal indicating fluid pressure in the plenum chamber as a function of time; and a programmable processor connected to the applanation detector and the pressure sensor, wherein the processor is programmed to evaluate the applanation signal and the pressure signal to provide a first pressure value (P means for reporting the calculated corneal resistance factor (CRF).