Posts Tagged ‘lens types’

Close to your eyes

To see from a medicinal perspective, contact lenses are worn to correct myopia (nearsightedness), hyperopia (farsightedness) or astigmatism. Besides, there are also contacts available to enhance or change the color of the eye with or without a prescription for visual correction. Theatrical contacts are also available to give the eye an appearance that matches a theatrical costume like a cat or zombie. We can say, contact lenses benefit many style person. 

Contact Lens Types 

- Soft Lenses: The most commonly prescribed contact lens are these gel-like containing plastics the size of the iris of the eye. More recently, the silicone hydrogel lenses have been introduced and are generally preferred by practitioners since they allow more oxygen to pass between the lens and the eye and are less likely to dry out. 

- Hard Lenses: Made from PMMA, which is plexiglass or lucite, these lenses are almost never used anymore but may be preferred or required by the patient. 

- GP or RGP Lenses: These are “oxygen permeable” lenses that are stiff, waterless plastics geared toward patients with presbyopia and a high astigmatism and a smaller than the iris of the eye. 

Contact Lens Wear

- Daily Wear contacts can be worn throughout the day but must be removed and cleaned nightly. Daily wear contact lenses come in different durations of wear time and must be eventually disposed of and replaced with a fresh pair. There are contacts that are disposed of daily, weekly or monthly depending on the preference as well as the visual needs of the patient. 

- Extended Wear contacts can be safely worn overnight or up to 7 consecutive days without removal. Continuous wear lenses are a type of extended wear that can be worn for up to 30 consecutive nights without removal.

There are also contact options available for more severe eye diseases and may need to be custom made to fit and serve the purpose of a special needs situation. Almost anyone these days can wear contacts, in fact 1 out of 5 people in the U.S. is a contact lens wearer. Whether the purpose for contact lens wear is a replacement to glasses or for more aesthetic purposes there is bound to be a healthy contact option available for everyone.
 

Love at first sight test

Dark Sparkle-Christmas make-up

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Article Source:http://www.articlesbase.com/vision-articles/close-to-your-eyes-1697763.html

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Zeiss lens types and coatings

Zeiss lens is produced by Carl Zeiss Vision Inc., one of the companies under Carl Zeiss International. Carl Zeiss is a German manufacturer of optical systems, industrial measurements and medical devices. Carl Zeiss Vision is a worldwide leader in developing lens designs, coatings and materials. The company continually creates Zeiss lenses that bring better vision in all aspects. Carl Zeiss lens features the forefront of innovative lens designs and technologies.

Zeiss lenses have many types, such as GT2TM and Gradal Brevity. GT2TM Zeiss lens has been carefully engineered around the vision and physiological requirements of the wearer. These Zeiss lens uses the proven total aberration control of Zeiss Optical Optimization & Management. GT2TM Zeiss lenses have many features. They are distortion-free above the 180 degree line for satisfying distance and peripheral vision. Available materials in this kind of Zeiss lens include 1.67 High index, Transitions, 1.59 polycarbonate, 1.5 Hard Resin, all of which have different colors. Gradal Zeiss lens has a fitting height as low as 16mm, which broadens the selection of frame styles. Gradal Zeiss lenses guarantee horizontal symmetry and provide an ultra-short style. This type of Carl Zeiss lens also features a full optical aspheric surface, which reduces distortions and astigmatism.

Zeiss lens also uses several coatings and is the industry leader in performance coating technology. Carl Zeiss lens applies self-invented anti-reflective coating. This coating on Carl Zeiss lens help diminish glares and get rid of reflection thus brings a better vision. Other coatings used by Zeiss lens include scratch-resistant coating, super-hydrophobic topcoats, which makes lenses more smudge resistant and easier to clean. Zeiss lens guarantees its coatings never crack, peel or flake.

Article Source: http://blog.firmoo.com/zeiss-lens-types-and-coatings.html

Firmoo’s Blog is the information source in area of vision care, including eyeglasses, sunglasses, contact lenses, sports protective eyewear, vision error and diseases, vision surgery, ageing and kid’s vision etc., solely sponsored by Firmoo.com, an emerging online optical store offering high quality eyewear at the lowest prices.Firmoo’s return and refund policy make any purchase risk-free.

Article Source:http://www.articlesbase.com/vision-articles/zeiss-lens-types-and-coatings-1440049.html

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