Abstract: A lens meter in which a measuring light flux is projected against a lens to be examined and the optical characteristics of the examined lens are measured in reference to the position of an image formed on a light receiving element by the measuring light flux passed through the examined lens is comprised of a mode changing-over device changing-over to a mode for measuring an additive diopter of a progressive focus lens, a measuring device for continuously measuring a refractive power of the examined lens, a reference position setting device for sensing a position having a predetermined optical characteristics of the progressive multifocus lens and defining a reference position of the examined lens, a displacement sensing device for sensing a displacement position of a measuring point from the reference position, and a displaying device for displaying the displacement sensed by the displacement sensing device.

Abstract: A lens meter having a measuring optical system comprises a device for measuring an optical characteristics continuously, a device for introducing the lens to the desired positional relation for a measuring optical axis in the measuring optical system on the basis of the measured data, a device for generating the alignment ending signal when the alignment is achieved to the predetermined standard level, a device for judging whether the measured data is stable within a predetermined permissible range of the variation, and a device for storing the measured data of the lens based on the judgment result. This apparatus further comprises a device for designating which the left or right lens should be measured, a device for generating the signal for reading-and-storing the measured data, a device for storing the measurement result, a device for detecting whether the lens exists on the measuring optical axis, and a device for judging the changing-over of the left or right of the lens.

Abstract: A lens meter in which a measuring light flux is projected against a lens to be examined and the optical characteristics of the examined lens are measured in reference to the position of an image formed on a light receiving element by the measuring light flux passed through the examined lens, comprises a device changing-over to a mode for measuring an additive diopter of a progressive focus lens, a device for measuring the refractive power of the lens continuously, a device for sensing a reference position having a predetermined optical characteristics of the progressive focus lens, a device for sensing dislocation between each measuring position and the reference position by sensing movement distance of the lens, a device for determining whether the value of the additive diopter obtained on the basis of the measurement by the measuring device is biggest or not, a device for storing the measuring position by the position sensing device when the value of the additive diopter is biggest, and a device for display

Abstract: The present invention provides a lens meter capable of accurately measuring the optical characteristics of a lens including additive diopter and of providing highly reliable data representing the optical characteristics of the lens. The lens meter projects measuring light through a target mark on a lens, focuses an image of the target mark in a target image on a photo-detecting device, and determines the optical characteristics of the lens on the basis of a locus of the target image detected by the photo-detecting device.

Abstract: A lens meter projects measuring light onto a lens, detects the measuring light traveled through the lens at a light detecting element, and determines the optical characteristics of the lens on the basis of the detected data obtained from the light detecting element. The lens meter provides a display device for displaying the relation to adjust the lens to the optical axis of the measuring optical path, measuring mode selector device for selecting a measuring mode from a single focus lens measuring mode to a progressive focus lens measuring mode, a control device for measuring the lens at position measuring points distributed at predetermined intervals on the lens successively on a measuring optical axis and measuring the refractive power of the lens at each measuring point.

Abstract: An ultrasonic diagnostic apparatus for ophthalmology according to the present invention includes a card connector into and from which a memory card is to be inserted and removed, a microcomputer incorporated in the apparatus, and a card interface for data transfer between the memory card and the microcomputer therethrough. Diagnosis data is obtained based on data of the memory card and data in the microcomputer, whereby even when a new program or data necessary for diagnosis is developed, the apparatus can immediately used the new program or data while eliminating the need for being modified. The apparatus thus can readily reproduce patient data and efficiently diagnose many patients.

Abstract: A novel ultrasonic diagnostic apparatus for ophthalmology is disclosed in which a plurality of reflection echo images having a dynamic range larger than a display are stored, an image of a given condition is retrieved from the reflection echo images thus stored, and the image thus retrieved is displayed. As many diagnostic data as possible are obtained from a single frozen image thereby to produce acoustic information on a biological tissue.