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  2. Solar viewer - Wikipedia

    en.wikipedia.org/wiki/Solar_viewer

    Solar viewers (also known as solar viewing glasses or solar eclipse glasses) are special eyewear designed for direct viewing of the Sun. Standard sunglasses are unable to filter out eye damaging radiation. Solar viewers can be used for safe viewing of solar events such as eclipses. The recommended optical density of this eyewear is 5, meaning ...

  3. Climate of Seattle - Wikipedia

    en.wikipedia.org/wiki/Climate_of_Seattle

    Rainy day in Capitol Hill, Seattle.Seattle experiences around 150 days with at least 0.01 inches (0.25 mm) precipitation each year. The climate of Seattle is temperate, classified in the warm-summer (in contrast to hot-summer) subtype of the Mediterranean zone by the most common climate classification (Köppen: Csb) [2] [3] [4] although some sources put the city in the oceanic zone (Trewartha ...

  4. Dark adaptor goggles - Wikipedia

    en.wikipedia.org/wiki/Dark_adaptor_goggles

    Dark adaptor goggles, also called red adaptation goggles, are goggles are made with red-tinted plastic lenses. They were invented by Wilhelm Trendelenburg in 1916, based on the work by Antoine Béclère on dark adaptation of the eye. The eyewear are often used by observers to preserve their natural night vision .

  5. Photochromic lens - Wikipedia

    en.wikipedia.org/wiki/Photochromic_lens

    A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state.

  6. Orthokeratology - Wikipedia

    en.wikipedia.org/wiki/Orthokeratology

    Orthokeratology lens. Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS), is the use of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia ...

  7. Sunglasses - Wikipedia

    en.wikipedia.org/wiki/Sunglasses

    Hunter S. Thompson was known for wearing yellow-tinted driving glasses. When driving a vehicle, particularly at high speed, dazzling glare caused by a low Sun, or by lights reflecting off snow, puddles, other vehicles, or even the front of the vehicle, can be lethal. Sunglasses can protect against glare when driving.