Sunglasses

Photophobia—Wear sunglasses when outside, even on cloudy days, keep rooms dimly lit, and close curtains or blinds to eliminate bright sunlight in the room soft indirect lighting is usually more comfortable. Schedule outdoor activities (when necessary) before die first dose of die drug is taken, such as early in die morning. 

Avoid ultraviolet light or sunlight because of the possibility of photosensitivity. Wear sunglasses, protective clothing, and a sunscreen when exposed to sunlight. 

Some of diese preparations cause sensitivity (photophobia) to light to minimize tiiis, wear sunglasses. 

The colored form of spironaphthopyran 32 absorbs at A,max of ca. 450 m,70 and the closed spiro form is colorless, which has no absorption band above 400nm. Bulky substituent group is especially important for photochromic sunglass. Introduction of the spiroadamantane or spirobi-cyclo[3.3.1]heptane into the 2-position of naphthopyran increases the resistance to photo-fatigue reaction, since endocyclic double bond induced by 1,7-hydrogen shift in the colored form cannot be formed in 2-adamantyl or 2-bicycloheptanyl group. 

Spirooxazine compounds are useful in the field of plastic lenses, such as sunglasses and ski goggles. The plastic photochromic sunglasses have been in the marketplace since the early 1980s, and their market share is presently ca. 70%. The excellent lightfastness of the spironaphthooxazine series makes such applications possible, compared to other photochromic compounds. 

Very hard, steel-gray metal. Hardens platinum. The International Prototype Meter in Paris consists of a Pt-Ir alloy. Its hardness and corrosion resistance is exploited in fountain-pen tips, spark plugs in powerful engines (airplanes), and electrical contacts. Used as a material in shells for nuclide batteries in satellites. Responsible for the iridescent properties of vapor-treated sunglasses. 

Vapor deposition allows the production of sunglass lenses with an extremely thin protective coating of iridium. 

James Kirkup, The Sunglasses, Manchester Guardian Literary Supplement, 1951. 

Both FGAs and SGAs can cause photosensitivity. Erythema and severe sunburns can occur. Patients should be educated to use maximal blocking sunscreens, hats, protective clothing, and sunglasses when in the sun. 

Several companies now produce sunglasses with melanin pigment embedded within the lenses the intention is for the commercial lens to mimic the way the eye blocks some wavelengths, i.e. forming natural sunglasses . The informative Website http // www.fcgmelanin.com has both history and science pages. 

Optical components for sunglasses, watch glasses, lenses, magnifying glasses, camera lenses... 

Sunglasses bridges for lenses, rear frames and arms, goggles... 

Sunglasses, magnifying glasses, lenses, lenses for eyeglasses. .. 

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