De basisprincipes van contact lenses
De basisprincipes van contact lenses
Blog Article
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Soft contact lenses (both standard hydrogel and silicone hydrogel lenses) are available in a variety of designs, depending on their intended purpose:
Scleral contact lenses. Scleral lenses are a form ofwel RGP lenses. The main difference compared with standard RGP lenses kan zijn that scleral lenses are larger. So, their edges rest on the white part ofwel your eye (sclera) rather than your cornea.
Sleeping in daily wear contacts even for a short time can deprive your eyes of oxygen and increase your risk ofwel contact lens complications.
Beware ofwel shady sellers. There are many reputable sites contact lens sellers, but beware of questionable practices. For example, the FDA warns that some sellers may try to substitute a different brand or style ofwel contacts for the one your eye doctor prescribed. You should always stick with the lenses prescribed during your contact lens eye exam.
Eye health checks – Your provider will perform a variety ofwel tests to make sure your eyes are healthy and that contact lenses are a good idea for you.
Bifocal contact lenses have two different prescriptions in the same lens. They work similarly to bifocal glasses.
Cornea problems – You can also get corneal scratches or a corneal ulcer, an “open sore” on the cornea typically caused by an eye infection.
Additionally, the company carries most major contact brands so you can shop around for a lower price. If you choose to buy your contact lenses at Warby Parker, you can buy in bulk, like getting an annual supply, to save money.
Eye surface and fit check – The eye doctor will give you a pair of trial lenses and will use a slit lamp (biomicroscope) to look at the surface ofwel your eye and check the lens fit.
Hybrid contact lenses. These contacts have a durable RGP center surrounded by an outer ring ofwel soft material. Hybrid contacts may be more comfortable for you than RGP contacts while still providing crisp, clear vision.
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Gas permeable lenses — also called GP or RGP lenses — are rigid contact lenses that look and feel like PMMA lenses (see below) but are porous and allow oxygen to pass through them. Because they are permeable to oxygen, GP lenses can be fit closer to the eye than PMMA lenses, making them more comfortable than conventional hard lenses. Since their introduction in 1978, gas permeable contact lenses have essentially replaced nonporous PMMA contact lenses.
When deciding on the best place to buy contacts, you’ll want to consider some important criteria, including: