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CR-39 is about half the weight of glass with an index of refraction only slightly lower than that of crown glass, and its high Abbe number yields low chromatic aberration, altogether making it an advantageous material for eyeglasses and sunglasses. A wide range of colors can be achieved by dyeing of the surface or the bulk of the material.
An example of a heavy metal fluoride glass is the ZBLAN glass group, composed of zirconium, barium, lanthanum, aluminum, and sodium fluorides. These materials' main technological application is as optical waveguides in planar and fiber form. They are advantageous especially in mid-infrared (2000-5000 nm) range. [8]
A makeshift burning glass, using the eyepiece of a telescope, being used to burn a leaf. Burning glasses (often called fire lenses) are still used to light fires in outdoor and primitive settings. [14] Large burning lenses sometimes take the form of Fresnel lenses, similar to lighthouse lenses, [15] including those for use in solar furnaces. [16]
8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.
Intel announces Vaunt, a set of smart glasses that are designed to appear like conventional glasses and are display-only, using retinal projection. [6] The project was later shut down. [7] Zeiss and Deutsche Telekom partners up to form tooz technologies GmbH to develop optical elements for smart glass displays. [8] [9]
Besides the information collection program started in 2007, there are two other programs sharing the name PRISM: [203] The Planning tool for Resource Integration, Synchronization and Management (PRISM), a web tool used by US military intelligence to send tasks and instructions to data collection platforms deployed to military operations. [204]
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