Hand-held ophthalmic device

摘要

A hand-held pachymeter includes an ultrasonic probe capable of emitting ultrasonic pulses and capable of receiving echo signals of the ultrasonic pulses. The echo signals may include an echo signal from an anterior portion of a cornea of an eye and an echo signal from a posterior portion of the cornea. The hand-held pachymeter also includes a hand-held computing device and an expansion module that interfaces the probe to the hand-held computing device. The expansion module includes circuitry to produce digitized signals that correspond to the echo signals, and a memory which stores computer instructions to determine a thickness of the cornea based on the digitized signals. The computer instructions are executed by the hand-held computing device.