Krishna Eye Centre Logo Krishna eye centre logo
Krishna Eye Centre
 
home | sitemap | reach us
 
Referactive Errors
As we grow older, our bodies undergo changes and eyes are no exception. Diminishing vision is one of the major handicap as we age. Many people don’t seek medical attention because of negligence and ignorance. Some take it as a part of aging and resign to fate. This is unfortunate since most of the eye problems can be prevented or corrected if detected in time. Periodic eye examinations are an important part of good preventive eye care.

When we look at any object, light rays pass from the object through the transparent cornea and the clear lens to strike the retina and form an image. The retina then relays the image to the brain through a set of wires called as optic nerve.

Refractive Errors:

When light rays from a distant object do not come to a focus on the retina, the image of the object appears blurred and the condition is called ammetropia.

Myopia
:
When the size of the eyeball is longer than normal, these light rays are focused in front of the retina. This is myopia or short sightedness. This can be corrected by concave lenses as spectacles or contact lenses.
Hypermetropia
:
When the size of the eyeball is shorter than normal, these light rays are focused behind the retina. This is hypermetropia or long sightedness. This can be corrected by convex lenses as spectacle or contact lenses.
Astigmatism
:
A normal eye has spherical cornea in all its meridians. When the cornea is steeper or flatter in any of its axis, it gives rise to astigmatism. This is corrected by cylindrical lenses as spectacles or toric contact lenses.
Presbyopia
:
The normal eye works like an autofocus camera which can focus for distance and near. This is achieved by change of shape of the lens in the eye directing the light rays onto the retina (back of the eye).

Myopia (Nearsightedness) Hyperopia (Farsightedness) Astigmatism (Blurry Vision)

But with age, the lens hardens and cannot change its shape as easily making it difficult to focus on small and close objects. Presbyopia often starts around the age of 40 years and slowly worsens until the age of 60 years. This is easily treated with bifocal or multifocal (progressive) glasses, monofocal and bifocal contact lenses and conductive keratoplasty.

Refractive Surgery:

The refractive errors can be corrected by laser surgery. The most common and most widely accepted surgery is Lasik.LASIK - Laser Assisted in Situ Keratomileusis

Laser Assisted in Situ Keratomileusis or Lasik is an outpatient surgical procedure used to treat myopia, hyperopia and astigmatism. With microsurgical equipments and laser, the cornea is reshaped so that the rays of light are focused on the retina. Lasik reduces your dependence on glasses and contact lenses.

The ideal candidate for Lasik is over 18 years of age, not pregnant or nursing and free of any eye diseases and a stable refractive error of 1 year.

Perfect refraction, retinal evaluation, corneal topography, and pachymetry are done to determine the suitability and safety of the procedure in a candidate.

How is Lasik done?

It is an outpatient surgical procedure. The eye is numbed with topical anesthetic eye drops. An eyelid holder is placed between the eyelids to keep them open and prevent the patient from blinking. Patient is supposed to stare at the blinking light throughout the procedure. A suction ring is placed on the eye to stabilize it and to flatten the cornea. One gets to feel pressure and the blinking light disappears for some time. An automated microkeratome attached to the suction ring moves across the cornea to make a horizontal cut, creating a hinged flap. The microkeratome and the suction ring are now removed and the corneal flap is lifted and folded back. The laser customized to the eye is focused and delivered. The laser sculpts the exposed corneal tissue and thus reshapes the cornea. The flap is now placed back and it sticks back on its own to the reshaped cornea in a few minutes.

The entire procedure takes about 7- 8minutes per eye. The patient is sent back home with a pair of protective glasses.

What happens after surgery?
It is normal to have irritation, redness, watering and burning in the eyes. It is best o rest the eyes by taking a short nap. Eye drops are prescribed to make the patient comfortable.

Side Effects
Side effects are few, but people may experience discomfort or pain, blurry vision, dryness, glare and haloes around light. There may be a red patch on the white of the eye, which may persist for a few days. Fluctuation in vision and the quality of vision may vary for some time. Vision may take up to 3 months to stabilize in some cases. Flap related complications and infection are rare.

What is Vision Like after Lasik?
It is important to have a realistic expectation. Over 90% of people achieve 6/6 to 9/9 visions without glasses or contact lenses. If refractive error is under corrected the result can be fine tuned by a second surgery called enhancement. People beyond 40years of age can also undergo Lasik for distance vision but will need glasses for reading after surgery.

Lasik is the most popular form of refractive surgery for decreasing dependence on glasses or contact lenses.
Krishna Eye Centre
102, Maryland Corner, Near H.P. Petrol Pump,
Sion Main Road, Mumbai - 400 022
Phone: +91-22-24071118
copyright 2008 krishna eye centre | all logos and trademarks are registered
Website Designed by Rushi Web World, Mumbai
Phone: 28081338 | E-mail: info@rushi.co.in
Home Our Team Enquiry Reach Us