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Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, [1] and they can be worn to correct vision or for cosmetic or therapeutic reasons. [2] In 2010, the worldwide market for contact lenses was estimated at $6.1 billion, while the US soft lens market was estimated ...
The effects of extended contact lens wear on the cornea have been studied extensively and are well-documented. When determining the effects of long-term contact lens use on the cornea, many studies do not differentiate between users of hard and soft contact lenses, while studies that have made this differentiation have found similar results.
In the US market, soft contact lenses are approved by the US Food and Drug Administration. [2] The American Optometric Association published a contact lens comparison chart called Advantages and Disadvantages of Various Types of Contact Lenses on the differences between them. [3] These include:
Google Contact Lens was a smart contact lens project announced by Google on 16 January 2014. [1] The project aimed to assist people with diabetes by constantly measuring the glucose levels in their tears. [2]
Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears. Glasses are typically used for vision correction, such as with ...
Intraocular lens. An Intraocular lens ( IOL) is a lens implanted in the eye usually as part of a treatment for cataracts or for correcting other vision problems such as short sightedness and long sightedness; a form of refractive surgery. If the natural lens is left in the eye, the IOL is known as phakic, otherwise it is a pseudophakic lens (or ...
Bionic contact lens. A bionic contact lens is a proposed device that could provide a virtual display that could have a variety of uses from assisting the visually impaired to video gaming, as claimed by the manufacturers and developers. [1] The device will have the form of a conventional contact lens with added bionics technology in the form of ...
In normal use, a much smaller section of the lens is used, so that the distortion is much smaller. Progressive lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. They are characterised by a gradient of increasing lens power, added to the wearer's correction for the other refractive errors.
121 mm × 76 mm × 32 mm (4.8 in × 3.0 in × 1.3 in) Weight. 365 g (12.9 oz) The Leica CL is a 35mm compact rangefinder camera with interchangeable lenses in the Leica M-mount. It was developed in collaboration with Minolta who manufactured it. It first appeared in April 1973 and was released in the Japanese market in November 1973 as the ...
With industrial design by Giorgetto Giugiaro, the F4 was the first professional Nikon to feature a practical autofocus system. The F4 is able to accept any of Nikon's manual focus (MF) or AF lenses from 1959 to the present day, including the two F3AF lenses (in Autofocus mode). The F4 succeeded the F3, a manual focus camera introduced in 1980 ...