(Procedures for Removal of Glasses)
LASIK is the most popular laser vision correction procedure in the world today. LASIK is a two stage procedure. The first step is creation of a flap of 90 – 130 micron thickness. The flap is then reflected and the exposed corneal stroma is called "THE BED". The second step is to modify the curvature of the cornea by laser shots – "ABLATION" on the bed according to the predetermined corneal profile made by computer suitable for the particular eye. The flap is the replaced on the bed to produce an un-interrupted surface . The flap sticks to the bed quickly in two minutes and there is no need of any stitch or bandage.
The vision is good just after the procedure and gets better with time and in nearly all the cases becomes perfect in one day.
WAVEFRONT GUIDED CUSTOM LASER CORRECTION
Wavefront is measurement of reflected light rays coming out of eye. This will measure the distortion of rays by aberrations in the eye. Wavefront guided C-Lasik corrects the corneal aberrations thereby offering a possibility of a super-vision which could be better than vision correction by glasses or contact lenses. Nidek NAVEX SYSTEM has 3 steps to a most accurate laser vision correction. The aberrometer "OPD Scan" measures 1440 points (Maximum in the industry – 80 to 200 in other machines) on the cornea and FINAL FIT software calculates the final profile and the laser shots to achieve that profile. This shot data is loaded into a USB pen drive and transferred to the EC 5000 "Quest" Excimer laser machine which then corrects the error in the eye according to the pre-planned ASPHERIC shape to achieve the best result.
The Nidek Quest system incorporates the fastest IRIS REGISTRATION software to detect smallest error in eye rotation (the torsion movement) during laser vision correction for more accurate correction of astigmatism, aberrations and accurate positioning of laser spots.
LASIK with TED (Iris Registration)
The Nidek Cx3 system incorporates the latest IRIS REGISTRATION software to detect smallest error in eye rotation (the torsion movement) during laser vision correction for more accurate correction of astigmatism.
LASIK What to expect
Lasik is a painless procedure that takes about 5 minutes. The eye is made numb with eye drops. There may be slight watering or irritation after the effect of these eye drops go away but that does not last for over one day normally.
Lasik is a 2 stage procedure where a 90 – 130 micron flap is first made with a microkeratome and reflected. The exposed surface "BED" is the treated with laser shots "ABLATION" to modify the curvature to the desired shape to achieve refractive correction.
The minimum requirement is
- Age above 18 years
- Stable refraction (Spectacle power) for one year
Besides the 2 conditions mentioned above , a sufficient corneal thickness and a normal corneal profile is necessary.
LASIK Post-op Care
After LASIK a normal life routine is possible after 2 days. There are no restrictions on food, watching TV or reading and these activities can be performed to the level of comfort. Washing face and taking bath is allowed with eyes closed with care so that water does not enter the eye. There is no restriction on room lighting.
After LASIK the person can perform all the tasks as before without dependence on glasses or contact lenses. The aim is to achieve a post lasik spectacle power of within +/- 0.50 D. Any residual power above this range may be corrected by enhancement after a minimum period of 3 months.
Lasik is basically a safe procedure and rate of complications is very low. Complications such as under or over correction can be managed by enhancement in majority of cases. The other complications are flap related and though are serious and vision threatening in nature , are becoming rarer with advances in microkeratomes and the present generation of microkeratomes are safer. Now the bladeless femtosecond laser keratome promises to be safer.
PRK, the thin outer layer of the cornea (epithelium) is removed and discarded prior to reshaping the underlying corneal tissue with an excimer laser. The epithelium repairs itself (grows back over the corneal surface) within a few days after surgery
BENIFITS OVER LASIK:
If the cornea is too thin for LASIK
No risk of flap complications
Safe even if you have undergone LASIK previously and therefore have a thinner residual cornea
DEMERITS COMPARED TO LASIK:
Slightly increased risk of eye infection
Haziness of vision in the first few days after surgery
PHAKIC INTRA-OCULAR LENSES
Phakic Intraocular lenses or Refractive IOLs are new age foldable IOLs which can be inserted through a small incision of 2.8 – 3.2 mm. These lenses are fixed between Iris and Natural lens of the eye without touching the natural lens and crowding the angle of the eye.This avoids complications like cataract and glaucoma. The other advantage of these lenses are that they can be removed any time.