Palo Alto, CA, United States
Palo Alto, CA, United States

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An optical product can reproduce a first 3D image of at least part of a first 3D object and a second 3D image of at least part of a second 3D object. The optical product comprises a surface configured, when illuminated, to reproduce by reflected or transmitted light, the first 3D image without reproducing the second 3D image at a first angle of view, and the second 3D image without reproducing the first 3D image at a second angle of view. Each portion of first portions can correspond to a point on a surface of the first 3D object, and comprise first non-holographic features configured to produce at least part of the first 3D image. Each portion of second portions can correspond to a point on a surface of the second 3D object, and comprise second non-holographic features configured to produce at least part of the second 3D image.


Patent
Wavefront | Date: 2016-11-03

Swept source optical coherence tomography (SS-OCT) systems and methods may employ down-conversion. Down-converter systems and methods may utilize a distribution element and a frequency down shifter. The distribution element may receive an output signal of a photo detection device, the output signal comprising a first frequency component at or below a maximum conversion frequency and a second frequency component above the maximum conversion frequency. The distribution element may send the first frequency component to an analog to digital (A/D) converter and send the second frequency component to a frequency down shifter. The frequency down shifter may down shift the second frequency component to a frequency at or below the maximum conversion frequency to form a down shifted second frequency component. The frequency down shifter may send the down shifted second frequency component to the A/D converter.


An optical measurement system method for measuring a characteristic of a subjects eye use a probe beam having an infrared wavelength in the infrared spectrum to measure a refraction of the subjects eye at the infrared wavelength; capture at least two different Purkinje images at two different corresponding wavelengths from at least one surface of the lens of the subjects eye; determine from the at least two different Purkinje images a value for at least one parameter of the subjects eye; use the value of the at least one parameter to determine a customized chromatic adjustment factor for the subjects eye; and correct the measured refraction of the subjects eye at the infrared wavelength with the customized chromatic adjustment factor to determine a refraction of the subjects eye at a visible wavelength in the visible spectrum.


A corneal topographer includes: a flat panel display configured to display a light pattern and to project the light pattern onto a cornea of an eye disposed on a first side of the flat panel display; an optical system disposed on a second side of the flat panel display, the optical system being configured to receive and process reflected light from the cornea that passes through the flat panel display from the cornea to the optical system; a camera configured to receive the processed reflected light from the optical system and to capture therefrom a reflected light pattern from the cornea produced in response to the projected light pattern; and one or more processors configured to execute an algorithm to compare the projected light pattern to the reflected light pattern from the cornea, and to produce a topographic map of the cornea based on a result of the comparison.


An optical measurement system and method measure a characteristic of a subjects eye. The optical measurement system receives from an operator, via a user interface of the optical measurement instrument, a begin measurement instruction indicating the start of a measurement period for objectively measuring at least one characteristic of the subjects eye. Subsequent to receiving the begin measurement instruction, the optical measurement system determines whether a criterion associated with the tear film quality of the subjects eye is not satisfied. In response to determining that the criterion is not satisfied, the optical measurement instrument takes one or more corrective actions to measure the characteristic of the subjects eye under a condition wherein the criterion is satisfied.


A system and method for measuring a characteristic of an eye of a subject receive data pertaining to the subject; assign the subject to an assigned age category based on the data pertaining to the subject; adjust a brightness level of a fixation target according to the assigned age category for the subject; provide the fixation target for a subject to view; and objectively measure at least one characteristic of the eye of the subject while the subject views the fixation target at the adjusted brightness level.


Patent
Wavefront | Date: 2017-03-27

Embodiments of this invention generally relate to systems and methods for optical treatment and more particularly to non-invasive refractive treatment method based on sub wavelength particle implantation. In an embodiment, a method for optical treatment identifies an optical aberration of an eye, determines a dopant delivery device configuration in response to the optical aberration of the eye, wherein the determined dopant delivery device is configured to impose a desired correction to the eye to mitigate the identified optical aberration of the eye by applying a doping pattern to the eye so as to locally change a refractive index of the eye.


A corneal topographer includes: a flat panel display configured to display a light pattern and to project the light pattern onto a cornea of an eye disposed on a first side of the flat panel display; an optical system disposed on a second side of the flat panel display, the optical system being configured to receive and process reflected light from the cornea that passes through the flat panel display from the cornea to the optical system; a camera configured to receive the processed reflected light from the optical system and to capture therefrom a reflected light pattern from the cornea produced in response to the projected light pattern; and one or more processors configured to execute an algorithm to compare the projected light pattern to the reflected light pattern from the cornea, and to produce a topographic map of the cornea based on a result of the comparison.


Grant
Agency: National Aeronautics and Space Administration | Branch: | Program: STTR | Phase: Phase II | Award Amount: 749.99K | Year: 2016

We propose to develop a Photon-Counting Integrated Circuit (PCIC) detector and focal plane array (FPA) with highest sensitivity, lowest noise and hence highest signal-to-noise ratio (S/N) among all FPAs covering the shortwave infrared band, for incorporation into a prototype imaging spectroscopy CAMM instrument for real-time operation on a planetary surface to guide rover targeting, sample selection (for missions involving sample return), and science optimization of data returned to earth, thus improving science return from instruments used to study the elemental, chemical, and mineralogical composition of planetary materials. During Phase I, we have successfully proven the concept of a limited-size array of PCIC detector pixels as well as the imaging spectrometer CAMM instrument. In Phase II, we will develop and prototype a PCIC focal plane array (FPA) as well as the imaging spectrometer CAMM instrument.


Grant
Agency: Department of Defense | Branch: Missile Defense Agency | Program: SBIR | Phase: Phase II | Award Amount: 1000.00K | Year: 2015

During Phase II, we will prototype the PCIC imager; characterize its dark count rate, quantum efficiency, gain, crosstalk, bandwidth, jitter, etc., as a function of the bias voltages and temperatures; perform environmental testing including operating temperature, vibration and thermal testing; compare between design specifications, model, simulation, and analysis and measured PCIC performance; deliver prototype PCIC imager. Approved for Public Release 15-MDA-8169 (20 March 15)

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