Posts Tagged ‘rgp lenses’

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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Astigmatism corrective toric contact lenses

Nowadays, toric contact lenses are available in nearly all lenses types, such as soft materials, disposable, frequent replacement, multifocals and colored types.

Toric contact lenses are similar with bifocals in focal points, which have two different powers resulted from different curvatures. So that toric lenses can correct both astigmatism and myopia or hyperopia. The difference between toric lenses and spherical lenses lies in that they can not rotate on eyes under blink or looking around. Toric lenses can be soft and RGPs and require more time and skills so that their prices are unavoidably higher.

If you only have a mild astigmatism between zero and 1.00 diopter, toric lenses is not a necessity. The rigidity of common spherical RGP lenses offer a comfortable shape for your cornea thus reduces the need for astigmatism correction. ECPs may also use high-power spherical soft lenses to achieve a same effect. Both of these two ways require some trials. A third type of lenses that reduce eye spherical aberration can also “correct” astigmatism without a need for toric lenses.

As mentioned before, toric lenses can be soft and RGPs. Most people neglect the shape-maintenance performance of RGP toric lenses and choose more comfortable soft lenses, even if RGPs provide a sharper vision.

Among the wide options of toric colored lenses, multifocal toric lenses and branded toric lenses, your ECP is the judge based on your eye conditions. While toric colored (both enhancement and change types) lenses are provided in both disposable and non-disposable types, multifocal toric lenses are mostly non-disposable and in RGPs type.

Toric contact lenses are offered by many brands in silicone hydrogel lens, including monthly disposable type and quarterly replacement lenses for special prescription. Customers always need to choose ECPs who offer fitting toric lenses for your personal vision welfare.

Article Source:http://vision.firmoo.com/contact-lenses/astigmatism-corrective-toric-contact-lenses.html

Vision Libraryis 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 byFirmoo.com, an emerging online optical store.

Article Source:http://www.articlesbase.com/vision-articles/astigmatism-corrective-toric-contact-lenses-1293860.html

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