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Hard gas permeable lenses are rigid and do require adaptation for wearing comfort. Hard gas permeable lenses generally have to worn on a ongoing basis to assure comfort.
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Yes, moisture that is in or on the treated material or surface passes through the treatment. After curing, the treatment is somewhat hydrophobic (water repellent), but it should not be considered a replacement for commercial water repellents.
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This is a rigid plastic contact lens that allows oxygen and carbon dioxide penetration.
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I am not sure which offers my eyes more oxgen - gas permable lenses or the newer, thinner disposable daily contact lenses. An optician at an eyeglass store sold me the disposables, but I am worried that his medical advice was biased by the sale. In
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This question about "What is meant by imp…" was originally asked in Yahoo!
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Cell membranes are selectively permeable. Some solutes cross the membrane freely, some cross with assistance, and others do not cross at all. A good example is your skin. It allows carbon dioxide and sweat to exit the body but keeps the blood in.
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Rigid gas permeable lenses unlike soft lenses have a more rigid consistency, are less flexible and last longer, the patients eyes can take several weeks to adapt to this type of lenses depending on the tolerance and motivation of the patient, it is
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In less permeable soils, the volume of water used for dilution is reduced while maintaining the recommended dose of the active ingredient (a.i.) per unit area. For e.g. instead of the recommended a.i. concentration and volume of water i.e. 10.5 ml
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Depends on the kind of rubber. Silicone rubbers are much more permeable to CO2. Many other rubbers (including natural rubber) are less permaeable to CO2. It's generally proportional to the relative solubility of the gasses in rubber.
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Yes. RGP's are smaller and made out of a harder, less pliable material than soft contact lenses which makes them less comfortable initially. RGP's correct astigmatism whereas soft spherical lenses do not. Soft toric lenses (see question 2 above)
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