Abstract: It is possible to improve the quality of an image of an eyeground, thereby acquiring an optimal image. An eyeground observation system (3) acquires an eyeground image via a compensation optical section (70) correcting the image of the eyeground obtained by illumination of an eyeground illumination system (2). A wave front correction system (1) measures wave front measurement data including a wave front aberration of the eye to be checked and/or aberration to be corrected, thereby acquiring the optical characteristic of the eye to be checked. An image data formation section (14-2) performs simulation of viewing at the eyeground, thereby calculating the simulation image data or MTF data. A correction amount decision section (14-3) decides a correction amount according to a voltage change template stored in a memory (144) and outputs it to a control section (15).

Abstract: The object of the invention is to provide a favorable spectral characteristic that reduces variation depending on the frequency of received light intensity, and that is gentle on a subject eye. It also eliminates displacement between positions of respective spectral images of the same part even if a change in alignment occurs between the eye and apparatus with the lapse of time.

Abstract: A refraction measuring instrument for measuring the refraction of an eye to be examined while the subject is viewing an external object in a more natural posture. A measuring light beam from a light source 21 is reflected from a mirror 25, shaped into a beam with a ring cross section, directed to a free curved surface prism 31 along an optical axis O2, reflected from a surface 31b and a beam splitting surface 31a, guided to an eye E along an optical axis O1 together with the visible light from outside the instrument, and form a ring pattern on the fundus F. The measurement beam reflected from the fundus F is received by a CCD 23 through the free curved surface prism 31 and a prism 22, and a ring pattern is imaged. A calculation control device 4 analyzes the imaged ring pattern and calculates the sphericity, the degree of astigmatism, and the astigmatic axis angle. For measurement, the subject A wears the refraction measuring instrument 1 on the head H through a wearing section 1a.

Abstract: It is possible to estimate optical characteristic according to a pupil diameter in daily life of an examinee, correction data near to the optimal prescription value, eyesight, and sensitivity. A calculation section receives measurement data indicating refractive power distribution of an eye to be examined and pupil data on the eye and calculates lower order and higher order aberrations according to the measurement data and the pupil data (S101 to 105). For example, a pupil edge is detected from the anterior ocular segment image and a pupil diameter is calculated. By using this pupil diameter, lower order and higher order aberrations are calculated. According to the lower order and higher order aberrations obtained, the calculation section performs simulation of a retina image by using high contrast or low contrast target and estimates the eyesight by comparing the result to a template and/or obtains sensitivity (S107).

Abstract: A model eye for an eye characteristic measuring device and a calibration method for the model eye. The model eye can have various aberrations and/or power characteristics to be formed by a combination of a refractive-type lens and a phase plate for adding aberration and can be used to confirm the accuracy of wavefront measurement or the like of the eye characteristic measuring device. The model eye includes an anterior eye lens forming a predetermined power to be given to the model eye, a diffusion surface diffusing and reflecting incident light, the diffusion surface being disposed at an image point position corresponding to the predetermined power in relationship to the anterior eye lens, and an aberration adding member giving a predetermined aberration to an area between the anterior eye lens and the diffusion surface. Power and aberration required for the model eye are formed by the anterior eye lens and the phase plate.

Abstract: Optical performance in a case where not only higher order aberrations but also lower order aberrations are added, are evaluated, lower order aberration quantities in which for example, a Strehi ratio is large and/or a phase shift is decreased, is calculated, and correction data, such as S, C and A, at that time is obtained, so that a result closer to a subjective value is obtained. An arithmetic part receives measurement data indicating a refractive power distribution of a subject eye and obtains lower order aberrations and higher order aberrations on the basis of the measurement data (S401, S403). The arithmetic part judges whether the higher order aberrations have a specified value or higher (S405).

Abstract: An eye-anterior-part observation system receives light reflected from an eye anterior part of the eye under measurement illuminated by an eye-anterior-part illumination light source. A movement-distance calculation section measures the displacement of the eye from an eye anterior image by the eye-anterior-part observation system. A wavefront compensation device compensates the wavefront of light reflected or transmitted. A wavefront-measurement section projects light on the eyeground, and receives light reflected from the eyeground through the wavefront compensation device. A calculation apparatus measures wavefront aberrations, based on the measured displacement of the eye and a light-receiving signal by the wavefront-measurement section. A wavefront-compensation-device control apparatus generates a control signal based on the wavefront aberration, and outputs to the wavefront compensation device to compensate the wavefront.

Abstract: A portable ophthmic apparatus (1) according to the present invention comprises a supporting part (7) to which a cellular phone (2) having a photographing camera (5) is mounted detachably and a main body (6) which is provided with the supporting part (7) integrally and has an illumination optical system (13) projecting an illumination beam toward photographing objective eyes (E) along an illumination optical axis (O2) intersected at a predetermined angle with a photographing optical axis (O1).

Abstract: The low-order aberration leading to better visual acuity is calculated from the results of measurement of an eye characteristic by an eye characteristic measuring instrument that can measure up to the high-order aberration, and data on a correction factor is collected, thereby obtaining a result more approximate to the subjective value. According to at least measurement data representing the wave aberration of the eye being examined (S401, S403), an image data creating unit creates optotype retina image data by conducting simulation of the visual acuity of an optotype (S405), considering the correction factor for refraction correction. A correction factor setting unit sets a correction factor to be given to the image data creating unit (S417). A judging unit judges from the correction opotype retina image data corrected by the correction factor whether or not an adequate correction factor is set (S407 to S421).

Abstract: The position of an object surface is detected with an error reduced on a reflectance boundary surface. A first light source (100) emits the luminous flux of the first wavelength. A first illumination optical system (200A) illuminates a small area on a retina (61) to be examined by the first luminous flux from the first light source (100). A first reception optical system (300A) guides a part of the luminous flux which is reflected by and retuming from the retina (61) to be examined to a first light reception part (510) via a first conversion member (400) for converting the reflected luminous flux into at least 17 beams. A second light source (110) emits the luminous flux of the second wavelength. A second illumination optical system (200B) illuminates a predetermined area on the retina (61) to be examined by the second luminous flux from the second light source (110).

Abstract: Measurement data (measured results) obtained under a plurality of conditions and image data and/or numerical data corresponding to the measured results are displayed collectively or selectively. An optical characteristics measuring device (100) measures/displays, for example, the optical characteristics of an eye to be measured (60) as an object. A first lighting optical system (10) includes a first light source (11) for applying an optical flux of a specified pattern to the eye to be measured (60). A first light receiving optical system (20) includes a first light receiving unit (23) for receiving light reflected from the eye (60). A light transmitting/receiving optical system (30) mainly conducts an alignment adjustment, and includes a second light receiving unit (35) for receiving light reflected from the eye (60). A common optical system (40) is disposed on the optical axis of a light flux emitted from the first lighting optical system (10), and is commonly included in the first lighting.

Abstract: The present invention relates to a device and methods for contrast sensitivity measurement. The device and the methods make it possible to precisely measure the contrast sensitivity of a subject within a short period of time. The device comprises a contrast target display part 100 for displaying contrast targets for a contrast sensitivity test, a contrast target data determination part 320 for determining contrast targets to be displayed on the contrast target display part 100 according to data on optical characteristics of an eye of a subject to be examined, a contrast target display control part 330 for instructing the contrast target display part 100 to display contrast targets based on contrast target data created in the contrast target data determination part 320 according to a predetermined procedure, and a display part 600 for displaying the results of contrast measurement of the subject using data on a history of responses of the subject to displayed contrast targets.

Abstract: Measurement of an eye characteristic is performed more accurately and at high speed by setting a measurement condition of a light receiving optical system with a long focal point or high sensitivity on the basis of an optical characteristic measured by a light receiving optical system with a short focal point or low sensitivity or high density.

Abstract: Scattering can be measured by using an optical system having a Hartman-Shack wave-surface sensor.

Abstract: A device comprises a refraction correcting part 700 for correcting refraction of an eye 400 to be examined of a subject; an adjusting state measuring part 800 for measuring whether a target observed by the eye 400 through the refraction correcting part 700 is in the adjustable range of the eye; and corrective value correcting means 360 for correcting a corrective value for the refraction correcting part 700 so that said eye can achieve best correction based on a result of measurement by the adjusting state measuring part 800, and is configured to measure visual acuity characteristics of the eye 400 at a corrective value for the refraction correcting part 700 to achieve best correction of the eye 400 according to responses of the subject about displayed targets.

Abstract: There is provided an ophthalmologic apparatus which can be effectively used for the clinic of a dry eye by using, as a basic principle, that when a tear film dries up, a corneal shape is changed and/or a wavefront aberration becomes large. When a measurement is started, the ophthalmologic apparatus is aligned. An arithmetic part performs an initial setting of a measurement interval of the apparatus, a measurement time and the like by a wavefront measurement part. An input part or the arithmetic part triggers a measurement start, and the arithmetic part repeats a measurement of the corneal shape and corneal wavefront aberrations by a measurement part until time reaches a measurement end time. When the time reaches the measurement end time, a judgment part analyzes a breakup state as one index for judgment of a state of a dry eye. The judgment part obtains values relating to the breakup to output them, and performs an automatic diagnosis about dry eye on the basis of the values.

Abstract: The invention includes an eye characteristic measuring apparatus which achieves accurate measurement by taking a difference component with relation with measured data in a reference optical path when optical characteristics of an eye are measured. Specifically the measuring apparatus is provided with a reference optical system separate from a light receiving system. Measurement of eye characteristics can include both aberration of an eye and aberration in the measuring apparatus. In order to achieve high accuracy, the eye characteristic measuring apparatus of the invention substantially removes aberration in strain of the equipment produced after the initial stage and aberration of the equipment caused by deformation due to temperature.

Abstract: A contrast chart device of the present invention comprises a contrast target presenting part for presenting a contrast target for a contrast sensitivity test at prescribed timing; a pupil data measuring part for producing an image of an anterior ocular segment of a subject and measuring the diameter or area of a pupil region in the anterior ocular segment; and a measurement timing forming part for forming timing at which the pupil data measuring part performs measurement.

Abstract: The aberration and refraction power data of an eye to be examined obtained from a first light reception unit and cornea data of the eye to be examined are correlated with each other so as to be overlaid accurately. A first signal and a second signal are concurrently captured, and the optical characteristics and cornea shape of the eye to be examined are measured concurrently or almost concurrently.

Abstract: A first signal and a second signal are captured at the same time, and the optical characteristics of a subject eye and the corneal shape thereof are measured simultaneously or substantially simultaneously. A calculation section captures a received light signal (first signal) from a first light receiving section and a received light signal (second signal) from a second light receiving section at the same timing or substantially the same timing, obtains the optical characteristics of the subject eye on the basis of the first signal, and obtains the corneal shape of the subject eye on the basis of the second signal. A measurement timing decision section decides, on the basis of the first and/or the second signal, measurement timings of the first signal and the second signal as objects for which a measurement calculation is carried out.