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i Lasik |
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This is also SBK with a corneal flap of 100 microns, except that the flap is lifted up by a different laser called a Femtosecond laser instead of a micro-kerotome. The usual laser is used to correct the refractive error and the flap is then placed back where it self heals as in SBK. Since a laser is used instead of a micro-kerotome blade to cut the flap ,it is also promoted as a bladeless technique. The results of i-lasik and SBK are similar. |
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Conventional Techniques |
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C-Lasik (Customized or Wave Front Guided lasik) |
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C-lasik corrects the spectacle power along optical aberrations in an eye resulting in a sharp vision .Optical aberrations are measured with a machine called aberrometer.
Surgical Technique- Local anesthetic eye drops are instilled in the eye to achieve a pain free procedure .The patient is made to lie under the laser machine and fix his gaze at a red light. A special machine called a microkeratome is used to pick up a thin flap of about 160 microns and the laser then works on the exposed cornea to reshape it, thereby correcting the spectacle power. It takes 20 to 60 seconds to complete the laser delivery to one eye. The corneal flap is placed back in position, where it self seals in two minutes. The entire procedure takes 7 minutes. |
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C-Lasik Aspheric |
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It is a further improvement over C-Lasik simple. The Laser improves the asphericity of the cornea along with the spectacle correction. This increases the sharpness of focus on the retina resulting in better contrast and quality of vision. |
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E-Lasik |
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This is a corneal tissue saving procedure and was specially developed for those people whose cornea is thin as seen by an ultrasound (Pachymetry). In such individuals lifting a flap with a micro-keratome as in C-lasik would reduce the corneal thickness further.
In this procedure the laser is directly delivered to the corneal surface to correct the eye sight. After this a bandage contact lens is placed over the eye where it rests for 5 days till healing takes place and then it is discarded. It takes about 7-10 days to regain clear vision compared to
C- Lasik where the recovery of vision is almost instant. |
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E-Lasik Aspheric |
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This is an E-Lasik with an aspheric component as in C-Lasik. |
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Lasik in Elderly - Monovision |
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In the elderly the eye requires a distance and a near spectacle power. The laser can correct any one power either for distance or for near. In monovision one eye is corrected fully to focus it for distance, and other partially for near. Thus with both eyes open, the person can do most of his distance and near routine activities without glasses and only for very fine work does a person need glasses. |
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Refractive lens exchange (RLE) |
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This is recommended in people over the age of 40 years. An eye is like a camera with a lens focusing light on the retina. Glasses are required if image is out of focus. In RLE the natural lens is replaced by an artificial lens of a suitable power to bring the image to focus on the retina without the need of glasses. However, a person would now need glasses for reading. The requirement of reading glasses can be reduced by creating monovision as described above (Lasik in elderly). |
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C-Lasik Laser being performed by Dr. Sanjay Chaudhary using the Nidek EC 5000 CX-III platform |
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