Patent ID: 8733932
Filing Date: 2014-05-27
Classification: A61B

Abstract:
1. A method for measuring an ocular axial length of an examinee's eye with an ophthalmic ultrasonic diagnosing apparatus, the apparatus comprising: an ultrasonic probe for A-mode measurement comprising a transducer that is arranged to emit an ultrasonic wave toward the inside of the eye, and receive return echoes from constituent parts inside the eye; and an analysis unit that is arranged to identify, by analyzing signals of the received return echoes, the respective return echo signals as a return echo signal from a cornea of the eye, a return echo signal from an intraocular lens that is implanted in the eye, multiple return echo signals that are produced from the return echo signals that repeatedly return between the intraocular lens and the transducer, and a return echo signal from a retina of the eye, while distinguishing the retinal return echo signal from the multiple return echo signals based on at least one of a property shown by the multiple return echo signals and a property shown by the retinal return echo signal, and calculate the ocular axial length based on the corneal return echo signal and the retinal return echo signal, the method comprising: identifying, via the analysis unit, the retinal return echo signal by at least one of: wherein the multiple return echo signals appear subsequent to the return echo signal from the intraocular lens and prior to a boundary position between the retina and a vitreous body, and wherein the retinal return echo signal appears subsequent to the boundary position.