HARD LENSES Meaning and
Definition
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Hard lenses, also known as rigid gas permeable (RGP) lenses, are a type of contact lens made from durable, rigid materials that allow oxygen to pass through. These lenses have a different composition compared to soft lenses, as they are made from a firm plastic material, such as silicone or fluorosilicone acrylate.
The key feature of hard lenses is that they maintain their shape on the eyeball, creating a more controlled environment between the lens and the cornea. Their firmness enables them to correct vision distortions and refractive errors by precisely focusing light onto the retina. This makes them particularly effective for individuals with astigmatism, as they can provide clear and crisp vision.
Due to their rigid nature, hard lenses resist deposit build-up and are less likely to cause eye infections. They promote better eye health by allowing oxygen to reach the cornea, reducing the risk of corneal infections and complications. However, they may require a period of adaptation for the eyes to adjust to their presence, and it may take time for wearers to become accustomed to inserting and removing them.
Hard lenses are typically prescribed and fitted by an optometrist to ensure a proper fit and vision correction. They require regular cleaning and disinfection to maintain hygiene and visual acuity. Although they are initially more costly than soft lenses, they have a longer lifespan and can offer superior vision correction for those who can comfortably adapt to the feel of a rigid lens on their eye.
Common Misspellings for HARD LENSES
- gard lenses
- bard lenses
- nard lenses
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- uard lenses
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- hsrd lenses
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- hqrd lenses
- haed lenses
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- hars lenses
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- harc lenses
- harf lenses
Etymology of HARD LENSES
The word "hard" in "hard lenses" refers to the rigid nature of these types of contact lenses. They are typically made from a rigid material called polymethyl methacrylate (PMMA). As for the etymology of the word "lens", it can be traced back to the Latin word "lēns", which means "lentil" or "lens". The term was first used in the context of optics in the 17th century to describe a transparent object with a curved surface (similar to a lentil) that could refract light.
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