Information about RGP contact lenses

1. RGP provides the greatest possible vision correction. No other method of correction of sight produces such result. The reason is that every person’s cornea has some "roughness" of a surface. The soft lens takes the shape of the cornea, while RGP lens creates a perfectly smooth optical surface.
   

2. Second, when you are exposed to the wind or very low humidity (mountain skiing, riding a bicycle, hockey, in a plane, etc.), the forward surface of a lens dries up, and it changes its optical power. The result is simple: the person sight isn’t very clear and the eyes feel uncomfortable until you restore the moisture in your eye. RGP lens doesn’t have this problem, RGP doesn’t dry up on a wind and dry air, hence, provides sharp vision all the time.
   

3. Oxygen permeability is also an issue. Your cornea receives oxygen only from the atmosphere. Therefore any barrier between an atmosphere and a cornea deprives it of oxygen. Soft lens always is bigger than the cornea, covers it like a bag, and prevents it from “breathing”. Thicker the lens – bigger the problem.
   
   Modern RGP contacts as the name suggests are made of silicone-polymers, which has high gas permeability. Even the best soft contact lenses let 5 times less oxygen through than RGP lens. The only exception are hydro gel soft contacts like Acuvue Advance, their oxygen permeability is acceptable. Besides, RGP lens is smaller then the cornea, so it doesn’t cover it all.

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5. Tears are very important for the eye health because they wash off all alien particles (a dust, a smoke, etc. They wash off bacteria as well. Tears don’t have easy access under the soft lens (because of its softness and large diameter). On the other hand, RGP actively moves in your eye, has smaller diameter and provides tear access. Besides soft lenses evaporate water from the surface, "extorting" tears from an eye that can lead to its irritation. RGP contacts do not demand additional moisture and "do not extort" from eye moisture.
   RGP lens life span is longer. It is usually good for 2 years, which makes it a much cheaper alternative to soft contact lenses, which you have to dispose often.
   

6. RGP are much less affected by protein build-ups than soft lenses. It is always a problem with soft contacts, good solution can reduce build-ups, but not prevent it. So with soft contact lenses the only way to have your lens always clean is to use daily disposable contacts. RGP lenses made from a different material and don’t contain any water at all. As a result they stay cleaner for longer period.
   

7. RGP aren’t at risk of drying (as they do not contain any water). If you let a soft lens to dry, you can throw it away, it is no longer usable
   

8. RGP contacts don’t break as easily as soft ones. Comfort has always been an advantage of soft lenses over rigid. However, modern RGP are designed for the maximum comfort for the eyes. They have a 5 - 7 days adjustment period, but after that the cornea adapts for the lens, and they feel as comfortable as soft lenses.
   

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