Contact lenses are a popular visual aid for the correction of refractive errors. They are second to the shows in popularity.
What are the different types of contact lenses?
(A) Depending on the material
1) Rigid contact lenses
They have stable physical parameters (acrylic, PMMA, silicones, polymer combination)
Commonly called hard lenses when they are made of PMMA and semifund or gas permeable when they are made of silicones.
2) Hydrogel lenses
They do not have stable physical parameters and have high proportions of water as a constituent. In general, they are known as soft lenses. They are easily molded to the contour of the front of the eye.
(SECOND) Depending on the type of correction desired
1) Spherical, for a simple spherical power correction.
2) Toric, correct cylindrical power, have a small ballast in the lower segment for stable orientation while in use.
(DO) Special purpose
1) cosmetic lenses
To hide spots on the cornea (opacities)
To create the impression of an eye, iris printing lenses
To change the color of the iris, for fashion or for both eyes to look the same in cases of a difference of tone or color of the iris in both eyes.
2) bandage lenses
To cover an abrasion, a small self-sealing cornea or blisters on the cornea for some reason.
3) Special lenses for correction of corneal irregularities
They are prescribed by specialists in conditions such as keratoconus (cone-shaped surface such as the cornea), pelvic degeneration (a degenerative disease that affects the periphery of the cornea.) They can be rigid material or hydrogel.
4) Scleral lenses
They are special lenses that are designed for irregularities of the cornea, have a larger diameter, rest on the sclera (white part of the eye) and have a liquid layer under them that cushions the cornea.
Care of contact lenses
There are specific care needs of each type of Contact Lens (CL) that are explained by the professional of the dispensation, but some basic rules are common to all:
1) Wash your hands with soap and water before handling a CL. Keep a mirror and clean towel handy while inserting a CL
2) Keep your kit away from cosmetics and talcum powder.
3) In case your CL falls to the ground, do not drag it. Wet your finger and touch the CL and it will adhere to the water film. Disinfect before reinsertion with the CL solution provided.
4) Daily disposable lenses should be thrown after a single use. The other disposable lenses should be discarded accordingly after opening and not after the number of uses!
5) Daily disposable CL is the safest option among hydrogel CLs.
6) Always keep a pair of prescription glasses for your safety.
7) Remove the LC from both eyes immediately if you have redness, eye discharge, glare, pain or foreign body sensation.
8) You can use lubricant drops and solutions as indicated in the CL, but not suspensions!
9) Periodic monitoring is important since the safety of the device in the hands of a patient is the responsibility of the professional who performs the dispensing.
Read the full article "Contact Lenses: Care and Pitfalls" written by Dr.Manoj Rai Mehta at Practo.com here: https://www.practo.com/healthfeed/contact-lenses-care-and-pitfalls-24219 / submit
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