What are Refractive Errors?

To see any object (e.g. tree), the cornea and lens bend and focus the rays from this object onto the  retina. These rays form an image on the retina. The nerves in the retina transmit this image to the brain via the optic nerve. The brain identifies the object. When the light rays are not bent properly to focus the image on the retina, the image is formed either in front or behind the retina. This image appears blurred. This condition is known as Refractive Error. The remedy for this problem is to use either spectacle or contact lens which make the image clear by focussing light rays on the retina. 

Problems people face when using spectacles or contact lenses
  • One looks older with specs.
  • Personality is believed to look dull with specs.
  • One may lose self confidence.
  • One has to look for the specs as soon as he/she wakes up and depend on them through the day.
  • Men and women may face matrimonial     obstacles.
  • In jobs in railways, police, military, modelling, specs may prove to be deterrent.
  • Specs are difficult to manage in games like cricket, football, tennis, swimming 
  • Wearing contact lenses for long time may cause infection and develop intolerance. 
 
Lasik treatment

In this treatment the cornea is polished with laser to focus the rays on the retina. Specs and contact lenses are not needed to have a clear image on the retina. The patient gets clear vision without specs or contact lens.
 
Eligibility for Lasik 
  • Patient must be aged 18 years and above
  • The number must be stable (unchanged) for 6 months 
However, the final decision is taken by the doctor after   detailed examination of the structure of the eye and the measurements of the cornea.
 
Information about Lasik treatment 
  • No pain is felt in this treatment.
  • No injection is given.
  • No patch is used/applied after the treatment.
  • Both eyes are treated at the same time.
  • The patient can resume routine activities like reading, driving, working on computer, going to office,     cooking, watching TV from the next day.
  • Minus, plus and cylindrical numbers can be  removed using this method. The patient gets normal vision     usually from the next day.
  • If the patient has number from –1 to –20 or from +1 to +7 or if the cylindrical number is between 1 and 7 then it can be removed using Lasik / Wavefront method. 
Preoperative examination for Lasik treatment

The doctor usually undertakes the following examinations:
  1. Slit lamp examination
  2. Autorefractometer examination
  3. Cycloplegic refraction
  4. Corneal topography examination
  5. Pachymetry
  6. Tonometry
  7. Funduscopy
  8. Aberrometry for wavefront
  9. Pentacam HR imaging of cornea - a modern   equipment to know whether the eyes of a patient are suitable for laser treatment. 
Several methods (like Lasik/ Wavefront/ Online Cyclotorsion/ Prolate-7/ Lapto Lasik) are available. A  decision on which method is suitable for whom is taken depending on refraction and measurement of cornea. 

The methods are:

1. Lasik
The eye is anaesthetized with drops. The eye is kept open using a speculum. After that a 130 microns flap of cornea is taken using the microkeratome. Then the flap is lifted and the laser rays are applied – the laser application time is calculated by the  computer program of the laser machine based on the spectacle number and other      measurements. After that the flap of cornea is replaced in its place. It assumes its original shape in 2 - 3 minutes and the patient can go home without any patch but has to wear sunglasses. The whole procedure takes 8 to 10 minutes.

2. Wavefront method
This method of laser vision correction removes the     spectacle numbers as well as improves the quality of    vision. There can be two types of errors in an eye. One is Refractive error (which are the spectacle numbers) and the other arises from defects like coma, typhoid, higher-order aberration which reduce sharpness and contrast sensitivity  of  vision. In this method 3D measurement of thousands of points of the cornea is taken. This helps in detecting     second type of error in an eye. This data along with the data of the spectacle numbers is fed into the machine and the laser treatment is customized for that eye. This treatment improves the sharpness and contrast sensitivity of the vision apart from removing numbers, provided the eye has the second type of error. The chances of facing night glare and halos are reduced in patients  undergoing this treatment.

3. Online Cyclotorsion method
Using the fingerprint of the iris (IRIS pattern) this software is used for treating eyes with cylindrical numbers with greater precision.

4. Prolate level –7 method
Since the original shape of the cornea is almost retained after this procedure, the problem of glare at night is      reduced considerably.

5. Lapto Lasik method
This method is useful for patients having very high       numbers and thin cornea. In Lapto Lasik, a flap of 90     microns of the cornea is made and the laser  treatment is given. With this method, very high number can be removed even though the cornea is very thin while retaining the thickness of the cornea.

Bladeless Lasik method: In this method the corneal flap is made using Laser. The rest of the procedure is done as in any of methods described above.

Before laser treatment…..
  • Start the prescribed antibiotics drops as directed.
  • Do not apply makeup on the eye.
  • Do not use perfume/ cologne.
  • Bring sunglasses with you on the day of  treatment.

After laser treatment…..
  • For some time the patient may feel pain or foreign body sensation and water may come out of the eye.
  • The eye drops should be put with clean hands and pain killer should be taken as advised.
  • The patient must lie down with closed eyes  after going home.
  • The eye should not be rubbed
  • Sunglasses should be used for protection.
  • Do not splash water in the eye. Avoid swimming for a month.
  • Routine work like watching TV, reading can be resumed from the next day.

The eye is prepared for procedure by giving anaesthesia.

A flap of cornea is made using ‘microkeratome’ and lifted.

The laser rays are applied.

The flap of cornea is then repositioned.

New methods for removing numbers of eyes with high numbers and thin cornea

Lasek treatment: Using this method numbers can be removed without damaging thin cornea.

ICL Phakic IOL (Implantable Contact Lens): According to the numbers and other measurements of an eye, customized contact lens made by an American company is implanted in the eye in an operation. Lenses are useful in eyes unsuitable for laser treatment. They can be removed/changed, if required.


Refractive Surgery (LASIK)


Lasik laser treatment is a modern technique to remove the numbers of spectacles. This treatment is provided at our Lasik centre.
For more information click the following link – To give a link to ‘Our Lasik Centre’ in ‘About Us’ section

Our Lasik Centre

Lasik laser treatment is a modern technique to remove the numbers of spectacles. This treatment is provided in Freedom Eye Laser Centre where Dr. Shah is a partner.

Address: Vraj Avenue, Second Floor, 
Nr. St. Xavier’s Ladies Hostel, 
Beside Petrol Pump, 
Nr. Swastik Cross Roads, 
Navrangpura, Ahmedabad 380009

Phone: (079) 26562177 / 26562178

The centre has USFDA (U. S. Food & Drugs Administration) approved Nidek CX III (Japan) laser machine. We provide treatment options like Lasik and Wavefront Lasik and Lapto Lasik. The machine has special programs like Prolate Level 7 treatment for good vision in low light conditions, Online Cyclotorsion treatment for eyes with cylindrical numbers and PAC treatment for presbyopic eyes. Before a procedure the patient is examined with Pentacam HR Imaging machine. It indicates whether the eyes of a patient are suitable for laser treatment.