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  2. Pinhole occluder - Wikipedia

    en.wikipedia.org/wiki/Pinhole_occluder

    A pinhole occluder is an opaque disk with one or more small holes through it, used by ophthalmologists, orthoptists and optometrists to test visual acuity. The occluder is a simple way to focus light, as in a pinhole camera, temporarily removing the effects of refractive errors such as myopia. Because light passes only through the center of the ...

  3. Subjective refraction - Wikipedia

    en.wikipedia.org/wiki/Subjective_refraction

    An occluder is placed over the eye that is not being tested (e.g.: over the left eye, to test the right eye's vision). A pinhole occluder is then placed before the patient's eye, and their vision is then tested again (each eye separately) to determine if the patient's poor visual acuity is a result of optical irregularities, or pathological issues.

  4. Pinhole glasses - Wikipedia

    en.wikipedia.org/wiki/Pinhole_glasses

    Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera , each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the ...

  5. Amazon Prime Big Deal Days Tool Sales to Save You Money

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    The price on this DeWalt mechanics tool set may be enough to make a gearhead drool. The 192-piece set features 1/4-inch, 3/8-inch, and 1/2-inch ratchets, plus standard and deep sockets that range ...

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    205-Piece Mechanics Tool Set. amazon.com. $122.30. Prime Day Yard Tool Deals Power+ ST1521S 15-Inch String Trimmer.

  7. List of optometric abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_optometric...

    Pinhole see Pinhole occluder and Visual_acuity#Legal_definitions: PHNI Pinhole No Improvement see Pinhole occluder and Visual_acuity#Legal_definitions: PHVA Pinhole Visual Acuity: PL Perception of light POH / PrOH Previous ocular history PPA Peri-papillary atrophy Pt Patient RAPD Relative afferent pupillary defect OD Right eye (oculus dexter) Ret.

  8. These are the top 100 Black Friday deals, according to Walmart

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    Mainstays 8-piece reversible bed in a bag comforter set for $28 Eureka Airspeed Plus Compact Upright Vacuum for $39.44 (save $29.56) Beautypeak Full Length Mirror for $45.99 (save $153.01)

  9. Confocal microscopy - Wikipedia

    en.wikipedia.org/wiki/Confocal_microscopy

    Fluorescence and confocal microscopes operating principle. Confocal microscopy, most frequently confocal laser scanning microscopy (CLSM) or laser scanning confocal microscopy (LSCM), is an optical imaging technique for increasing optical resolution and contrast of a micrograph by means of using a spatial pinhole to block out-of-focus light in image formation. [1]

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