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Photochromic lens: Quiz

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Question 1: The glass version of these lenses achieve their ________ properties through the embedding of microcrystalline silver halides (usually silver chloride), or molecules in a glass substrate.
ZincOxygenPhotoelectrochemical processesPhotochromism

Question 2: Photochromic lenses may be made of ________, polycarbonate, or another plastic.
GlassCranberry glassBorosilicate glassMACOR

Question 3: A study by the Institute of Ophthalmology at the ________ has suggested that even in dark conditions photochromic lenses can absorb up to 20% of ambient light.
University College LondonImperial College LondonDurham UniversityKing's College London

Question 4: This thermal effect is called "temperature dependency" and prevents these devices from achieving true ________ darkness in very hot weather.
AnorakVelcroSunglassesEarring







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