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Low water nonionic. High water nonionic. Low Water ionic. High Water ionic. Silicone hydrogel polymers. Production generations. References. List of soft contact lens materials. Soft contact lenses are one of several types of contact lenses for corrective vision eyewear as prescribed by optometrists and ophthalmologists.
Alcon offices in Johns Creek, Georgia. Alcon Inc. (German: Alcon AG) is a Swiss-American pharmaceutical and medical device company specializing in eye care products. It has a paper headquarters in Geneva, Switzerland but its operational headquarters are in Fort Worth, Texas, United States, where it employs about 4,500 people.
In optics, chromatic aberration (CA), also called chromatic distortion, color aberration, color fringing, or purple fringing, is a failure of a lens to focus all colors to the same point. [1][2] It is caused by dispersion: the refractive index of the lens elements varies with the wavelength of light. The refractive index of most transparent ...
The reflection from the coated lens is tinted because the coating works better at some wavelengths than others. An antireflective, antiglare or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses, other optical elements, and photovoltaic cells to reduce reflection. In typical imaging systems, this improves ...
Scleral lens. Side view displaying vaulted area of a scleral lens. A scleral lens, also known as a scleral contact lens, is a large contact lens that rests on the sclera and creates a tear -filled vault over the cornea. Scleral lenses are designed to treat a variety of eye conditions, many of which do not respond to other forms of treatment.
Unlike most bayonet-mount lenses, the Contax G mount uses a breech-lock mechanism similar to the manual-focus Canon FD and FL mount. [2] The very high optical quality of the G-series lenses makes them excellent candidates for use with high-resolution digital sensors. Adapters are available for the Sony E-mount and Micro Four Thirds digital camera.
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