Methods and apparatus for identifying an eye, especially a human eye (10), on the basis of the visible features of the iris (20) and pupil (30). The eye is first illuminated until the pupil reaches a predetermined size, at which an image of the iris and pupil is obtained. This image is then compared with stored image information for identification. The stored image information is previously obtained from an eye, the pupil of which was similarly brought to the same predetermined size. The illumination of the iris may include oblique illumination from several positions around the circumference of the iris. The illumination from each position may be relatively monochromatic, so that the resulting shadow will lack the color of the light source (172) at that position providing better contrast for elevation-dependent features. A system for performing iris recognition (100) may include a processor (190) which controls an illumination control circuit (170) and a camera (180) to obtain images at several predetermined sizes of the pupil.

Iris recognition system.

In accordance with one aspect of the present invention, an optical coherence tomography-based ophthalmic testing center system includes an optical coherence tomography instrument comprising an eyepiece for receiving at least one eye of a user or subject; a light source that outputs light that is directed through the eyepiece into the user's or subject's eye, an interferometer configured to produce optical interference using light reflected from the user's/subject's eye, an optical detector disposed so as to detect said optical interference; and a processing unit coupled to the detector. The ophthalmic testing center system can be configured to perform a multitude of self-administered functional and/or structural ophthalmic tests and output the test data

Optical coherence tomography- based ophthalmic testing methods, devices and systems

In applications where it is desired to determine the locations of image features, such as eye monitoring to determine the direction that a person is gazing, determining the point at which he is gazing, or measuring the motions of his eye using a camera to capture an optical image of the eye and image processing to extract information about the eye's gaze point and/or orientation, there is provided a method and apparatus for precise location of image features such as edge coordinates between the pupil anc iris of the eye and of the center coordinates of light reflections off the cornea of the eye.

Eye tracking method and apparatus

Systems, databases, methods, and implementations provide for electronic management of negotiations for a proposed transaction, where at least one of the first and second sides of the transaction include multiple subscribing parties. Contemplated transactions preferably, but do not necessarily rise to the level of a legally biding commitment, and include all manner of transactions for goods and services. The basic terms of a proposed transaction will usually, but not necessarily, apply to all parties. Preferred embodiments are also parameter driven, and self-evolving, and handle basic transaction terms such as action, item description, quantity, maximum price, commitment windows, and close date, as well as additional transaction terms that may or may not have been adopted by previous users. Transactions can be single for single or multiple lots.

Electronic marketplace that facilitates transactions between consolidated buyers and/or sellers

In accordance with one aspect of the present invention, an optical coherence tomography instrument comprises an eyepiece for receiving at least one eye of a user is provided; a light source that outputs light that is directed through the eyepiece into the user's eye; an interferometer configured to produce optical interference using light reflected from the user's eye; an optical detector disposed so as to detect said optical interference; and electronics coupled to the detector. The electronics can be configured to perform a risk assessment analysis based on optical coherence tomography measurements obtained using the interferometer. An output device can be electrically coupled to the electronics, and may be configured to output the risk assessment to the user through the output device. The optical coherence tomography instrument can be self-administered, and the eyepiece can be a monocular system or a binocular system.

Optical coherence tomography device, method, and system

An eye fundus camera comprising a photographing system for taking a picture of an eye fundus, a fundus illumination system for alternatively providing infrared light and visible light to illuminate the fundus, a viewer connected to the photographing system for the observation of the fundus, an image pick-up part containing therein an image pick-up tube and connected to the photographing system through a stationary wavelength dividing mirror which reflects infrared light and transmits visible light, and a light intercepting screen plate retractably disposed in the optical light path between the wavelength dividing mirror and the image pick-up tube.

Eye fundus camera

The instrument projects, to the anterior portion of a human eye, plural component beams images of which form a single mark image when said component beams are aligned, and inspects if said component images of the mark are aligned The instrument is exactly positioned with respect to the human eye when said component images are aligned The mark image is observed through a finder of the instrument or by an infrared-visible image converter connected to the instrument, or it is refocused on and detected by photoelectric cells

Eye examining instrument

In an apparatus having a ray generator for directing measuring rays through a first optical path, a light-receiving portion for receiving the measuring rays reflected by the eye fundus through a second optical path, and a uniting device for uniting the first and second optical paths to form a third optical path, and also having movable lens groups in each of the first and second optical paths or a movable lens group in the third optical path, and wherein the movable lens groups or group is moved along the optical path to measure the refractive power of the eye from signals corresponding to the positions of the movable lens groups or group and the signal of the light-receiving portion, the movable lens groups or group is made into an afocal system to prevent the dimensions of the pupil from being varied and a collimator for collimating the principal rays is fixedly disposed on that side of the movable lens groups or group which is adjacent to the eye to be examined.

Apparatus for measuring the refractive power of the eye

PURPOSE:To perform the relative adjustment of the quantity of light to an imaging element, by providing a control means for relatively regulating the illumination quantity of light to the two-dimensional imaging element of an illumination system when the observation state of an anterior part by the two-dimensional imaging element is transferred to an operation state by an operation means. CONSTITUTION:An examiner performs the positioning of an eye E to be examined with a cornea shape measuring apparatus to allow the number of cornea reflected images 4A-4D to coincide with the number of light sources 4a-4d and the quantities of the emitted lights of the light sources 4a-4d are regulated to the predetermined quantity of light for measuring the shape of the cornea. Next, the reference voltage from a D/A converter 23 is adjusted and the video signals of the cornea reflected images 4A-4D are binarized to be stored in a binarizing memory 22. The number of the cornea reflected images 4A-4D are compared with the number of the light sources 4a-4d from the image signal of the binarizing memory 22 and, when both of them do not coincide the positioning of the eye E to be examined and the cornea shape measuring apparatus is performed and, when both of them coincide, the diameters of the cornea reflected images 4A-4D in the image signal of the binarizing memory 22 are calculated to calculate the center of gravity and shape of the cornea Ec.

Apparatus for measuring shape of cornea

The present invention relates to an eye fundus camera with mark projecting optics which projects a mark on the eye fundus in order to facilitate the focus setting.

Isao Matsumura

Papers

Eye fundus camera

Eye examining instrument

Apparatus for measuring the refractive power of the eye

Apparatus for measuring shape of cornea

Eye fundus camera with focus setting device