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The Morgan lens can be used in many situations requiring ocular irrigation or the application of medicine to the eye, including cases of chemical eye burns, thermal burns, irritants (e.g., gasoline, detergent), nonembedded foreign bodies, foreign body sensation with no visible foreign body, routine cleansing before eye surgery or eyelid surgery, or for infections.
An optical coating is one or more thin layers of material deposited on an optical component such as a lens, prism or mirror, which alters the way in which the optic reflects and transmits light. These coatings have become a key technology in the field of optics.
Large and small first aid kits used by the British Red Cross for event first aid, in the internationally recognized safety green with a white cross. These kits also feature the red cross , which is a protected symbol under the Geneva Conventions and may only be used by the Red Cross or military.
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A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
The lens of the eye is the most obvious example of gradient-index optics in nature. In the human eye, the refractive index of the lens varies from approximately 1.406 in the central layers down to 1.386 in less dense layers of the lens. [1] This allows the eye to image with good resolution and low aberration at both short and long distances. [2]
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