What is Contact Lens?
It is a corrective, cosmetic, or therapeutic lens made up of medical grade plastic materials usually placed on the cornea of the eye, used mainly for correction of refractive error.

 

What are its advantages?
Contact lenses makes you spectacle-free and thus offer a more active life, greater cosmetic acceptability, better & clearer images, lack of misting, good field of view, etc.

 

What are indications of contact lenses apart from refractive errors?
Contact lens can be used in cornea cases like Keratoconus, to provide support to thin corneas, or to provide regularity to irregular corneas and to hide corneal opacities, etc. Contact lenses are also used for cosmetic reasons where the lenses are without any refractive power but different colors. In certain conditions where outer layer of cornea is absent, due to pathological reasons or iatrogenically, bandage contact lenses provide relief.

 

In what cases spectacles are preferred?
Care of contact lens is slight cumbersome hence individuals who cannot be trained well for its use like in case of school going children, neurotic patients, people with poor manual dexterity, etc. spectacles may be recommended over contact lenses. Patients with high cylindrical power, severe allergic disorders, or any external eye disorder are also not ideal ones for contact lens prescription.

 

How many types of CL's are available?
Two main types of contact lenses are available for refractive correction: Rigid Gas Permeable (Semi-soft) and Soft. Specially designed contact lenses such as Rose-K lenses, sclera and semi sclera lenses, piggy back lenses etc are used in patients with ectatic corneal disorders such as keratoconus.

 

How long can one wear contact lens?
Wearing duration of a contact lens is decided by lensí oxygen transmissibility. Higher the oxygen transmissibility the longer the lens can be worn. Generally lenses can be safely worn during all waking hour of the day. One should not sleep with contact lenses on.

 

What are the differences between rigid and soft contact lenses?
Rigid lenses are hard lenses. They are smaller than the diameter of the cornea hence initially they feel quite uncomfortable but they are easy to maintain and are relatively safe in terms of complications. Soft lenses are a lot more comfortable but require greater care and have slightly more risk of causing allergies and infections.

 

What are daily and extended wear lenses?
Daily wear lenses are worn for only 10-12 hours a day and are removed at night. While extended wear lenses can be worn continuously for a week or so.

 

What are disposable contact lenses?
These contact lenses are worn on a daily wear basis and then regularly replaced by a fresh pair every day (Daily disposable) or fortnightly (Bi-weekly disposable). Replacement with a fresh pair reduces the risk of allergies and infections.

 

What complications can occur if CL's are worn for long?
Over-wear Syndrome can occur due to deprivation of oxygen to the cornea. The symptoms are eye redness, pain, watering, swelling of lids etc.

 

What is Enzyme treatment of contact lenses?
After some period of use, soft contact lenses develop protein deposition on them from the eye secretions. These deposits can give rise to allergies in the eye. These can be removed by subjecting the contact lenses to Enzyme Treatment with enzyme tablets every fortnight.

 

What are cosmetic lenses?
Contact lenses of different shades and pattern are available, which impart the eyes of the wearer a look of a different color.

 

What is a contact lens trial?
Contact lens has to be customized for every patient based on corneal curvature, corneal diameter and refractive error. Such a lens is fit on to the patient's eye and the fit assessed after giving it about 20 minutes to settle in the eye. A perfect fit is important to ensure good eye health and clear vision.

 

Contact lens services
At our centre we provide contact lens trial with fitting and dispensing of lenses for cases ranging from simple refractive errors to complex corneal surfaces such as post-transplant eyes and patients with keratoconus. We have facility of providing all sort of therapeutic or cosmetic lenses.