Lenses


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Lenses

Glass or plastic devices used in electrical fixtures to alter the effect of light coming from the fixture, such as frosted, lenticular, and the like.
References in periodicals archive ?
It also holds the second position for cosmetic lenses and for speciality lenses that address conditions such as astigmatism and presbiopia.
Russian scientists did the same thing with solid polymers, he notes, but no one has done it in soft, hydrophilic polymers-materials used for contact lenses.
Right and left lenses delivered in the same secondary package
Howland of Cornell University refined those experiments by fitting the chicks with refractive lenses.
As an improvement over existing technology or older panoramic technologies such as fisheye and mirror lenses, the IMV1-1/3 overcomes specific visual challenges and does not require an investment in additional equipment.
Associated most frequently in a number of studies with soft contact lenses -- especially extended-wear varieties, which can be worn overnight -- this corneal disease can result in permanent loss of vision.
Due to its sophisticated construction, many zoom lenses offer true coaxial illumination, which is the most efficient means of illuminating a flat specular object.
a) Lenses compatible with this mechanism are the PENTAX K-, KA-, KAF- and KAF2-mount lenses; screw-mount lenses (with an adapter); and 645- and 67-system lenses (with an adapter).
Taking advances in both theory and experiment to heart, researchers are now looking for lenses in our galaxy.
A companion article, "Buying Contact Lenses Online," outlines special considerations when shopping on the Internet, including how to evaluate the trustworthiness of a website and using online tools for price comparison.
have explored an alternative technology for making high-quality lenses and other optical elements.
The EF70-200mm f/4L IS USM lens delivers the legendary sharpness and clarity of the Canon 'L' series lenses in a compact and lightweight design that is easy to use for hand held photography, making it a versatile lens for any photographer.