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- Pinhole_glasses abstract "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 retina and increases depth of field. In eyes with refractive error, the result is claimed to be a sharper image. However, a second effect may appear at the common bridge between each two adjacent holes, whereby two different rays of light coming from the same object (but each passing through a different hole) are diffracted back toward the eye and onto different places on the retina. This leads to double vision (objects having doubled edges) around the rim of each hole the eye is not focussing on, which can make the overall image disturbing and tiring to look at for prolonged periods of time.Unlike conventional prescription glasses, pinhole glasses produce an image without the pincushion effect around the edges (which makes straight lines appear curved). While pinhole glasses are claimed to be useful for people who are both near- and far-sighted, they are not recommended for people with over 6 diopters of myopia. Additionally, pinhole glasses reduce brightness and peripheral vision, and thus should not be used for driving or when operating machinery.Merchants state that after prolonged use, the plastic grating should become easy to ignore. However, each time the user blinks, the horizontal lines of the grating will briefly appear to be thicker. This is because the eyelid moving over the pupil will reduce the amount of light falling onto the retina and thus will briefly remove the lateral inhibition effect which normally makes all the holes appear bigger (and the grating appear thinner). So, as long as the user keeps blinking, they will be constantly reminded of the dark grating covering their eyes.Pinhole glasses have been marketed by various companies on the claim that—combined with certain eye exercises—they could permanently improve eyesight. Skeptics argue that no scientific evidence has been found to support them. Due to a lack of formal clinical studies to substantiate this type of claim by companies selling pinhole glasses, this type of claim is no longer allowed to be made in the United States under the terms of a legal settlement with the Federal Trade Commission.The pinhole occluder, a device used by ophthalmologists and optometrists for diagnosis of refractive errors, works on the same principles, but is not intended for use outside of diagnosis.As viewing through a pinhole can much improve clarity of vision of people with refractive error, in an emergency a clear view can sometimes be obtained by looking through a single improvised pinhole.".
- Pinhole_glasses thumbnail Rasterbrille.jpg?width=300.
- Pinhole_glasses wikiPageID "1807772".
- Pinhole_glasses wikiPageLength "3959".
- Pinhole_glasses wikiPageOutDegree "15".
- Pinhole_glasses wikiPageRevisionID "667614956".
- Pinhole_glasses wikiPageWikiLink Category:Corrective_lenses.
- Pinhole_glasses wikiPageWikiLink Circle_of_confusion.
- Pinhole_glasses wikiPageWikiLink Depth_of_field.
- Pinhole_glasses wikiPageWikiLink Diffraction.
- Pinhole_glasses wikiPageWikiLink Diopters.
- Pinhole_glasses wikiPageWikiLink Dioptre.
- Pinhole_glasses wikiPageWikiLink Distortion_(optics).
- Pinhole_glasses wikiPageWikiLink Eye_exercises.
- Pinhole_glasses wikiPageWikiLink Glasses.
- Pinhole_glasses wikiPageWikiLink Image_distortion.
- Pinhole_glasses wikiPageWikiLink Lateral_inhibition.
- Pinhole_glasses wikiPageWikiLink Myopia.
- Pinhole_glasses wikiPageWikiLink Peripheral_vision.
- Pinhole_glasses wikiPageWikiLink Pinhole_camera.
- Pinhole_glasses wikiPageWikiLink Pinhole_occluder.
- Pinhole_glasses wikiPageWikiLink Refraction_error.
- Pinhole_glasses wikiPageWikiLink Refractive_error.
- Pinhole_glasses wikiPageWikiLink Vision_therapy.
- Pinhole_glasses wikiPageWikiLink File:Rasterbrille.jpg.
- Pinhole_glasses wikiPageWikiLinkText "Pinhole glasses".
- Pinhole_glasses wikiPageWikiLinkText "pinhole glasses".
- Pinhole_glasses hasPhotoCollection Pinhole_glasses.
- Pinhole_glasses wikiPageUsesTemplate Template:Citation_needed.
- Pinhole_glasses wikiPageUsesTemplate Template:Reflist.
- Pinhole_glasses subject Category:Corrective_lenses.
- Pinhole_glasses hypernym Eyeglasses.
- Pinhole_glasses comment "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 retina and increases depth of field. In eyes with refractive error, the result is claimed to be a sharper image.".
- Pinhole_glasses label "Pinhole glasses".
- Pinhole_glasses sameAs Rasterbrille.
- Pinhole_glasses sameAs Lunettes_à_grille.
- Pinhole_glasses sameAs Spéaclaí_mionpholl.
- Pinhole_glasses sameAs Rupičaste_naočale.
- Pinhole_glasses sameAs Okulary_ajurwedyjskie.
- Pinhole_glasses sameAs m.05ykrc.
- Pinhole_glasses sameAs Перфорационные_очки.
- Pinhole_glasses sameAs Q1432406.
- Pinhole_glasses sameAs Q1432406.
- Pinhole_glasses wasDerivedFrom Pinhole_glasses?oldid=667614956.
- Pinhole_glasses depiction Rasterbrille.jpg.
- Pinhole_glasses isPrimaryTopicOf Pinhole_glasses.