Patent ID: 6079828
Filing Date: 2000-06-27
Classification: A61B

Abstract:
An ophthalmic measurement apparatus for observing or measuring an eye to be examined by positioning the apparatus so as to have a predetermined positional relationship with the eye, the ophthalmic measurement apparatus comprising:alignment target projecting means for projecting an alignment target onto a cornea of the eye;alignment means provided with a photographing optical system for photographing an image of the projected alignment target by photoelectric imaging elements to perform an alignment based on condition of the alignment target image photographed by said photoelectric imaging elements;measurement target projecting means for projecting a target for a measurement onto the cornea of the eye;measurement means for determining a measurement of a corneal shape of the eye based on an image of the projected target for measurement photographed by said photoelectric imaging elements;focal depth varying means for making a focal depth of the image photographed by said photoelectric imaging elements variable; andchangeover means for switching said focal depth, which is made to be variable by said focal depth varying means, upon the alignment and upon the measurement.