WHY DO WE NEED GLASSES?
Normally light entering the eye is focused on to the retina by the cornea and the lens producing a sharp and clear image.
Disparity between focusing power and length of the eyeball results in defocus and is called a refractive error.
In myopia(minus number) the eyeball is too long and in hyperopia(plus number) the eyeball is too short.
The spectacles and contact lenses correct this defocus and allow clear and crisp vision. Astigmatism or cylindrical power is a type of error in which one surface of the cornea is more curved than the other causing an elliptical defocus. It is corrected by cylindrical lens spectacles or toric contact lenses.The greater the power of spectacles the greater the defocus without glasses and hence greater dependency on the glasses
- Spectacles and contact lenses offer effective but temporary correction. Spectacles however have their limitations i.e. need to be put on and taken off daily and cared for. They are a good option during the growing years when the spectacle power constantly changes and permanent solutions are not advisable.
- Contact lenses need to be cared for, have a wearing time limit of 10-12 hours a day and result in significant dry eyes over a period of time
Once the spectacle power has stabilized, permanent alternatives to spectacles/contact lenses are considered .
PRK/ LASIK/ LASEK are all forms of Laser vision correction which allow clear vision independent of spectacles/lenses in most cases and spectacle independence in all individuals who are suitable candidates for it.
This allows a person broader career opportunities and hindrance free outdoor activities like swimming, trekking, football/ tennis
Laser vision correction allows us the opportunity to see naturally 24x7 NO MORE the hassle of spectacle fogging/contact lens cleaning and care, NO more squinting your eyes to see the time first thing in the morning. Finally freedom to go swimming, snorkelling, white water rafting or any other adventure sport without worrying about your spectacles!!!
WHO CAN HAVE LASER VISION CORRECTION?
- Individuals over the age of 18 years with a stable spectacle power for a year.
- Those with spectacle number of between -8, to +5 and cylindrical power of up to 4 (those with higher powers need to be assessed individually for suitability).
- Those with no retinal or other eye disease. This is a short procedure in which the shape of the front of the eye (cornea) is altered to change the focusing power of the eye and allow clear vision. Advances in technology allow safer and faster treatments which can now be customised to match the individual eye allowing not only spectacle free vision but sharper and aberration free one While these procedures have excellent results, a detailed evaluation needs to be done before the procedure is planned to ensure optimum results.
PRE PROCEDURE EVALUATION
All individuals wearing contact lenses must stop wearing them for a week before evaluation to avoid errors in readings due to lens warpage.
- Verification of spectacle power(with and before instilling drops)
- Measurement of corneal power(keratometry)
- Mapping of corneal surface( topography)
- Measurement of corneal thickness(pachymetry)
- Measurement of aberrations if any(aberrometry)
- Examination of the eye for dryness, any scars/opacities, etc (slit lamp biomicroscopy).
- Measurement of eye pressure (tonometry).
- Examination of the retina (fundoscopy).
After evaluation a detailed counseling is done to ensure realistic expectations thus maximizing outcomes.
PROCEDURE OF LASIK/PRK
- Done under anesthetic drops-no injection!
- Eye helped to stay open with clip
- Surface layer removed(PRK)/thin flap created(LASIK)
- Laser ablation(pre programmed) done
- Eye wash & Bandace contact lens(temporary)
- Eye drops for few weeks post procedure
THE PROBLEMS AFTER LASER VISION CORRECTION ARE UNCOMMON IF THE ELIGIBILITY CRITERIS ARE STRICTLY FOLLOWEDThese Include:
- Regression (Number Coming Back)
- Thinnig of Cornea
- Ghost images
- Inflammation/Infection in the Postoperative Period