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  2. Dark adaptor goggles - Wikipedia

    en.wikipedia.org/wiki/Dark_adaptor_goggles

    Dark adaptor goggles are goggles made with red-tinted plastic lenses. Dark adaptor goggles were invented by Wilhelm Trendelenburg in 1916. [1] The concept is based on the work by Antoine Béclère on dark adaptation of the eye, where it is noted that fluoroscopy relies on the use of the retinal rods of the eye.

  3. Visual snow syndrome - Wikipedia

    en.wikipedia.org/wiki/Visual_snow_syndrome

    This is why in dim light we often see the world blurred and grainy, without clear contours. While cones (which are responsible for color perception and detail) are activated in brighter light, the rods provide vision in low light, but with a loss of precision.

  4. Night vision - Wikipedia

    en.wikipedia.org/wiki/Night_vision

    A specific type of NVD, the night vision goggle (NVG) is a night vision device with dual eyepieces. The device can utilize either one intensifier tube with the same image sent to both eyes, or a separate image intensifier tube for each eye. Night vision goggles combined with magnification lenses constitutes night vision binoculars.

  5. Night-vision device - Wikipedia

    en.wikipedia.org/wiki/Night-vision_device

    Night vision devices may be handheld or attach to helmets. When used with firearms, an IR laser sight is often mounted to the weapon. The laser sight produces an infrared beam that is visible only through an NVD and aids with aiming. [3] Some night vision devices are made to be mounted to firearms.

  6. Adaptation (eye) - Wikipedia

    en.wikipedia.org/wiki/Adaptation_(eye)

    Night vision is of lower quality than day vision because it is limited in resolution and colors cannot be discerned; only shades of gray are seen. [1] In order for humans to transition from day to night vision they must undergo a dark adaptation period of up to two hours [ 2 ] in which each eye adjusts from a high to a low luminescence "setting ...

  7. AN/PVS-7 - Wikipedia

    en.wikipedia.org/wiki/AN/PVS-7

    The AN/PVS-7 is a single tube biocular night vision device. Third-generation image intensifiers are able to be installed and are standard for military night vision. Most newer PVS-7 intensifier tubes are auto-gated to prevent image intensifier damage if exposed to intense light. The goggles have a built-in infrared Illuminator for low-light ...

  8. AN/PSQ-42 - Wikipedia

    en.wikipedia.org/wiki/AN/PSQ-42

    The AN/PSQ-42 Enhanced Night Vision Goggle-Binocular (ENVG-B) is a third-generation passive binocular night vision device developed for the United States Army by L3Harris. It combines dual tube image-intensifying (I²) and thermal-imaging technologies into a single goggle, enabling vision in low-light conditions.

  9. Our Lady of Cabra Island - Wikipedia

    en.wikipedia.org/wiki/Our_Lady_of_Cabra_Island

    One recorded vision has the lady smiling and with a sweet, reassuring voice, telling them in Tagalog: “Ako ang Inmaculada Concepción. ” (“I am the Immaculate Conception.”) While a small chapel has since been erected on the hilltop where the supposed apparitions occurred, the incident has not been formally approved by the Philippine ...