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MIT NETRA
NETRA is a mobile eye diagnostic device developed at MIT Media Lab consisting of a clip-on eyepiece and a software app for smart phones. The co-inventors include Ramesh Raskar and Vitor Pamplona. It can be seen as the inverse of expensive Shack–Hartmann wavefront sensor, Shack-Hartmann sensors. NETRA allows for the early, low-cost diagnosis of the most common refractive Refractive error, Refractive Disorders. The subject looks into the device and aligns patterns on the display. By repeating this procedure for eight meridians, the required refractive correction is computed. NETRA exploits the fact that aberrations are expressed using only a Eyeglass prescription, few parameters (Spherical, Cylindrical and Axis of Astigmatism) to create an easier user interaction approach. Leveraging mobile connectivity, the system can transmit test data to appropriate facilities for immediate action, aggregate data for use in analysis, or instruct a separate machine for automatic dispensing of spect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ron NASA NETRA
Ron is a shortening of the name Ronald. Ron or RON may also refer to: Arts and media *Big Ron (EastEnders), Big Ron (''EastEnders''), a TV character *Ron (King of Fighters), Ron (''King of Fighters''), a video game character *Ron Douglas, the protagonist in ''Lucky Stiff (film), Lucky Stiff'' played by Joe Alasky *Ron Weasley, a character in ''Harry Potter.'' Language * Ron language, spoken in Plat State, Nigeria * Romanian language (ISO 639-3 code ron) People Mononym *Ron (singer), Rosalino Cellamare (born 1953), Italian singer Given name *Ron (given name) Surname *Dana Ron (born 1964), Israeli computer scientist and professor *Elaine Ron (1943-2010), American epidemiologist *Emri Ron (born 1936), Israeli politician *Ivo Ron (born 1967), Ecuadorian football player *Jason De Ron (born 1973), Australian musician *José Ron (born 1981), Mexican actor *Liat Ron, actress, dancer and dance instructor * *Lior Ron (born 1982), Israeli-American film and trailer composer and musicia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ramesh Raskar
Ramesh Raskar is a Massachusetts Institute of Technology Associate Professor and head of the MIT Media Lab's Camera Culture research group. Previously he worked as a Senior Research Scientist at Mitsubishi Electric Research Laboratories (MERL) during 2002 to 2008. He holds 132 patents in computer vision, computational health, sensors and imaging. He received the $500K Lemelson–MIT Prize in 2016. The prize money will be used for launching REDX.io, a group platform for co-innovation in Artificial Intelligence. He is well known for inventing EyeNetra (mobile device to calculate eyeglasses prescription), EyeCatra (cataract screening) and EyeSelfie (retinal imaging), Femto-photography (trillion frames per second imaging) and his TED talk for cameras to see around corners. In February 2020, Raskar and his team launched Private Kit: SafePaths, a public health tool for contact tracing for COVID-19 pandemic. He is also the Founder and Chief Scientist of PathCheck. He is a co-founder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shack–Hartmann Wavefront Sensor
A Shack–Hartmann (or Hartmann–Shack) wavefront sensor (SHWFS) is an optical instrument used for characterizing an imaging system. It is a wavefront sensor commonly used in adaptive optics systems. It consists of an array of lenses (called lenslets) of the same focal length. Each is focused onto a photon sensor (typically a CCD array or CMOS array or quad-cell). If the sensor is placed at the geometric focal plane of the lenslet, and is uniformly illuminated, then, the integrated gradient of the wavefront across the lenslet is proportional to the displacement of the centroid. Consequently, any phase aberration can be approximated by a set of discrete tilts. By sampling the wavefront with an array of lenslets, all of these local tilts can be measured and the whole wavefront reconstructed. Since only tilts are measured the Shack–Hartmann cannot detect discontinuous steps in the wavefront. The design of this sensor improves upon an array of holes in a mask that had been dev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Refractive Error
Refractive error, also known as refraction error, is a problem with focus (optics), focusing light accurately on the retina due to the shape of the human eye, eye and or cornea. The most common types of refractive error are myopia, near-sightedness, hyperopia, far-sightedness, astigmatism, and presbyopia. Near-sightedness results in far away objects being blurred vision, blurry, far-sightedness and presbyopia result in close objects being blurry, and astigmatism causes objects to appear stretched out or blurry. Other symptoms may include double vision, headaches, and eye strain. Near-sightedness is due to the length of the eyeball being too long, far-sightedness the eyeball too short, astigmatism the cornea being the wrong shape, and presbyopia aging of the lens of the eye such that it cannot change shape sufficiently. Some refractive errors occur more often among those whose parents are affected. Diagnosis is by eye examination. Refractive errors are corrected with eyeglasses, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eyeglass Prescription
An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient. If an eye examination indicates that corrective lenses are appropriate, the prescriber generally provides the patient with an eyewear prescription at the conclusion of the exam. The parameters specified on spectacle prescriptions vary, but typically include the patient's name, power of the lenses, any prism to be included, the pupillary distance, expiration date, and the prescriber's signature. The prescription is typically determined during a refraction, using a phoropter and asking the patient which of two lenses is better, or by automated refractor, or through the technique of retinoscopy. A dispensing optician will take a prescription written by an optometrist and order and/or assemble the frames and lenses to then be dispensed to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sensors
A sensor is a device that produces an output signal for the purpose of sensing a physical phenomenon. In the broadest definition, a sensor is a device, module, machine, or subsystem that detects events or changes in its environment and sends the information to other electronics, frequently a computer processor. Sensors are always used with other electronics. Sensors are used in everyday objects such as touch-sensitive elevator buttons (tactile sensor) and lamps which dim or brighten by touching the base, and in innumerable applications of which most people are never aware. With advances in micromachinery and easy-to-use microcontroller platforms, the uses of sensors have expanded beyond the traditional fields of temperature, pressure and flow measurement, for example into MARG sensors. Analog sensors such as potentiometers and force-sensing resistors are still widely used. Their applications include manufacturing and machinery, airplanes and aerospace, cars, medicine, robot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
