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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. System Mechanic Software | 30-Day Free* Trial | AOL Products

    www.aol.com/products/utilities/system-mechanic

    Download System Mechanic to help repair and speed up your slow PC. Try it free* for 30 days now. ... System Mechanic can help patch these security holes to help prevent hackers or malware from ...

  4. Film perforations - Wikipedia

    en.wikipedia.org/wiki/Film_perforations

    Film is commonly checked for broken sprocket holes before presentation, a process known as "spooling". Mechanical devices exist for this purpose, but the classic method is to place the finger and thumb of a gloved hand on the edges of the film, which is mounted on a winding bench, and to slowly run the film through the fingers, feeling for snags.

  5. Shadow mask - Wikipedia

    en.wikipedia.org/wiki/Shadow_mask

    A shadow mask is a metal plate punched with tiny holes that separate the colored phosphors in the layer behind the front glass of the screen. Shadow masks are made by photochemical machining, a technique that allows for the drilling of small holes on metal sheets. Three electron guns at the back of the screen sweep across the mask, with the ...

  6. 5 details you missed from the 'Saturday Night Live' 50th ...

    www.aol.com/5-details-missed-saturday-night...

    Jack Nicholson made his first on-screen appearance in 10 years. Jack Nicholson, who's best known for films like "The Shining" and "One Flew Over the Cuckoo's Nest," was also in attendance. It ...

  7. Screen burn-in - Wikipedia

    en.wikipedia.org/wiki/Screen_burn-in

    Burn-in on a monitor, when severe as in this "please wait" message, is visible even when the monitor is switched off. Screen burn-in, image burn-in, ghost image, or shadow image, is a permanent discoloration of areas on an electronic visual display such as a cathode-ray tube (CRT) in an older computer monitor or television set.

  8. Trepanning - Wikipedia

    en.wikipedia.org/wiki/Trepanning

    Detail from The Extraction of the Stone of Madness, a painting by Hieronymus Bosch depicting trepanation (c. 1488–1516). Trepanning, also known as trepanation, trephination, trephining or making a burr hole (the verb trepan derives from Old French from Medieval Latin trepanum from Greek trúpanon, literally "borer, auger"), [1] [2] is a surgical intervention in which a hole is drilled or ...

  9. Apple II graphics - Wikipedia

    en.wikipedia.org/wiki/Apple_II_graphics

    This created problems when the user loaded a text or a lo-res graphics screen directly into video memory—replacing the current information in the holes with what was there at save-time. Disk head recalibration was a common side-effect, when the disk controller found its memory—in a screen hole—of where the head was, suddenly not to match ...

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