Contact Lens is a thin curved medical device that we place directly over the cornea or the ocular surface. It is made up of biocompatible material.
There are different types of contact lenses according to the material, size and wearing modalities
Types of Lenses :
Soft contact lenses – are made of soft, flexible plastics that allow oxygen to pass through to the cornea the clear dome that covers the colored part of the eye. This lens material may be easier to adjust to and provide better initial comfort than hard or rigid gas permeable, contact lenses.
1. To correct refractive error
2. To change eye appearance (Cosmetic Contact lens )
Gas permeable contact lenses are made up of durable medical grade plastic material that allows oxygen to pass through the lens. These lenses are also known as GP lenses, rigid gas permeable lenses, RGP lenses and oxygen permeable lenses.
1. Corneal Astigmatism
2. High Refractive Error
3. Corneal Scar
4. Corneal Ectasia’s
Advantages: Improve vision in irregular cornea.
Disadvantages: Discomfort initially
These lenses are designed in such a way that very small aspheric back optic zone diameter that decreases as the base curve steepens and a very rapid peripheral flattening from the back optic zone.
3. PMCD etc.
– Better quality of vision
– Comfort is more compare to RGP CL
– Expensive then RGP CL
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The piggyback contact lens system consists of a rigid gas permeable (RGP or GP) lens placed on top of the soft contact lens. This combination gives a clear vision of a GP lens with a comfort for wear.
1. Corneal Ectasia (Keratoconus, PMCD, TMCD )
2. To improve the comfort and fitting.
– Comfortable then RGP and Rose K2 Contact Lens
– Care and maintenance of two lenses required
– Handling of lenses are little difficult.
These lenses are designed to vault over the entire corneal surface and rest on the sclera, scleral lenses can cover an irregular cornea into a smooth surface to correct vision problems caused by keratoconus and other forms of corneal ectasia.
1. Advance corneal Ectasias due to Keratoconus, TMCD, PMCD etc.
2. Dry Eye.
3. For better comfort.
As we were directly inside the eye it should be taken from a contact lens specialist to avoid the fitting and correction-related complication.
The consultant advises that care and maintenance instructions should be followed to prevent ocular complications.