The eye functions like a camera. Light rays entering the eye are focused by the cornea and the lens of the eye onto the light-sensitive retina (which is like the film of a camera) at the back of the eye. The retina then transmits a clear image, or photo, to the brain.
Lasik & Refractive Error
Normal Eye(Emmetropia)
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The eye functions like a camera. Light rays entering the eye are focused by the cornea and the lens of the eye onto the light-sensitive retina (which is like the film of a camera) at the back of the eye. The retina then transmits a clear image, or photo, to the brain.
What is a Refractive Error?
Normally, rays of light entering the eye are brought to a precise focus on the retina – the light-sensitive layer lining the back of the eye. When such a focus is not achieved, a refractive error results and vision is not clear. These imperfections in the focusing power of the eye are called refractive errors. The common refractive errors are:
- Myopia, or Nearsightedness
- Hyperopia, or Farsightedness
- Astigmatism
Myopia (Nearsightedness)
A myopic eye is longer than normal or has a cornea that is too steep so that the light rays focus in front of the retina. Close objects look clear, but distant objects appear blurred
Hyperopia (Farsightedness)
Hyperopia is the term used to describe the condition of Farsighted. The causes of hyperopia are typically genetic and involve an eye that is too short or a cornea.
i.e. too flat, so that images focus at a point behind the Retina. People with hyperopia can usually see distant objects well but have trouble focusing on nearby objects.
Astigmatism (Distorted vision):
ASTIGMATISM (cylindrical error) occurs when incoming light rays unable to reach a common focus within the eye. Astigmatism distorts or blurs vision for both near and far objects. The cornea is the clear front window of the eye
A normal cornea is round and smooth, like a basketball. When you have astigmatism, the cornea curves more in one direction than in the other, like a football. It is possible to have astigmatism in combination with myopia or hyperopia.
Treatment for Refractive errors:
There are several alternatives to correct your vision:
- There are several alternatives to correct your vision.
- Refractive Surgery –It is also an option to correct or improve your vision. These surgical procedures are used to adjust your eye's focusing ability by reshaping the cornea, or front surface of your eye.
- Phakic Lens- In this procedure an intraocular lens, is fixed in front of the natural clear lens — behind the iris. The word ‘phakic’ means that the natural crystalline lens is left in the eye.
Why Would You Be Interested In Lasik ?
- You do not want to wear spectacles or contact lenses.
- You feel visually and socially restricted by spectacles or contact lenses.
- You are intolerant to contact lenses.
- You want to participate in certain outdoor sports where using spectacles or contact lenses may be a problem.
- You plan to join certain professions wherein excellent uncorrected visual acuity is a prerequisite
Are you an ideal candidate for corneal refractive surgery?
- Be at least 18 years of age, with a stable refraction for the past 6 month.
- Myopia (Minus number), Hypermetropia (Plus number), Astigmatism (cross number , cylindrical number or degree number) can be treated.
- Have healthy eyes that are free from any eye diseases or corneal abnormalities (E.g. Scar, Infection, etc)
EXCIMER LASER:
- The use of the EXCIMER LASER in corneal refractive surgery has greatly increased the safety of the procedure as the refractive correction is achieved by the removal of a little as 10 to 20% of the total corneal thickness.
- The excimer laser is a “cool” laser, and does not generate heat in the cornea. The laser energy destroys intermolecular bonds in the corneal tissue resulting in tissue removal by a process termed “photoablative decomposition”.
- The exquisite precision with which tissue can be removed and the absence of thermal damage render this laser particularly suitable for surgery on the delicate cornea.
- Removal of corneal tissue alters the corneal contour. By specifically removing tissue from different portions of the cornea, the surgeon is able to correct the different refractive errors.
Lasik Surgery & Its Step
LASIK (or Laser-Assisted In-Situ Keratomileusis) is the most modern surgical procedure for correcting vision problems like myopia, hyperopia, and astigmatism.
This is an advanced laser vision correction technique in which the curvature of the cornea is reshaped using a laser that is capable of removing tissues with precision up to a micron level
A Laser procedure is SAFE, PROVEN, TRUSTED. It takes only 10 min to “change your life” get rid of your glasses.Laser vision correction has enabled millions of people worldwide to enjoy a new found freedom-Living there lives without the inconvenience of glasses or contact lenses.
Say "Hello" to your dreams. Are you ready for your freedom?
LASIK at SHRADDHA Eye Hospital AND LASER CENTRE is completely “SAFE” and “PAINLESS” with consistent results
There are three steps in Lasik surgery.
STEP 1: With the help of keratome corneal flap is made.
STEP 2: With the help of excimer laser corneal reshaping is done.
STEP 3: Corneal flap is put back.
The main purpose of surgery is to offer sufficient good vision to patients so that they are not dependent upon glasses most of the time. Some of the possible side effects of LASIK are undercorrection, overcorrection, glare, halos, and reduced contrast sensitivity.
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Femto Lasik (Bladeless Lasik)
FEMTO-LASIK or BLADELESS LASIK, is a form of refractive eye surgery similar to LASIK that creates a corneal flap with a femtosecond laser rather than with a mechanical microkeratome, which uses a blade. The only difference between LASIK and FEMTO-LASIK is the method by which the LASIK flap is created. The actual refractive correction by corneal ablation can then be performed with any excimer laser that is able to perform LASIK
A LASIK flap created with a femtosecond laser is regarded as an improvement over traditional LASIK because of a greater accuracy in flap size, shape, and thickness.
The computer-guided infrared femtosecond laser is focused just below the surface of the cornea. Each laser pulse creates a tiny bubble there. A pattern of many overlapping bubbles is created, allowing to lift off a flap off the cornea. The procedure then continues as in traditional LASIK, with an excimer laser removing material from the exposed surface beneath the flap.
Although the final long-term clinical outcome of LASIK with a mechanical microkeratome and FEMTO LASIK may be similar, the increased accuracy of the flap with the femtosecond laser provides an anadded margin of precision.
Post Lasik Instructions
What you are likely to experience after the procedure:
- Mild or moderate tearing from both eyes is common and can differ from one eye to the other on the day of treatment.
- Foreign body sensation or irritation in the eyes.
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- Sensitivity to bright light.
- Hazy vision on the day of the treatment.
FAQ
WHAT IS LASIK?
LASIK Stands for LASER IN SITU KERATOMILESIUS.It is a form of laser vision correction that is capable of correcting range of glass numbers. The procedure uses a computer controlled excimer laser to correct your vision.
Does LASIK hurt?
The treatment itself is painless because we put a few anesthetic drops in your eyes to make you even more comfortable. You will feel pressure on and around the eye during treatment. With LASIK, some patients may experience a feeling of "something in the eye" for a day or so after treatment.
Do the results from laser treatment permanent?
Yes. Most of the eye growth takes place up to the age of 18 years. After this the eye refraction tends to stabilize and not change. Lasik should be done after the stability of the glass power has occurred for at least 6 month. The results are then permanent
How do I know if I am a good candidate for LASIK?
A large percentage of nearsighted, farsighted, and astigmatic patients are potential candidates for LASIK. Patients who are 18 years of age or older, have healthy eyes that are free from retinal problems, corneal scars, and any eye disease are suitable. Along with being medically suitable, the best candidates are people with a lifestyle or occupation in which they are dissatisfied with their contact lenses or glasses. By having an evaluation, examination, and consultation with you, the doctor will be able to determine if you are a good candidate.
How long does LASIK take?
In our practice, LASIK is performed as an office procedure. The entire treatment takes about 5 to 7 minutes per eye or approximately 10-15 minutes for both eyes.
What kind of Anesthesia is used during the treatment?
Numbing eye drops are used. Sometimes an oral medication is used to help with relaxation. Don't worry - no needle or intravenous drugs are used.
Can you have both eyes treated at the same time?
Treatment can be performed on both eyes on the same day. You may elect to have one eye done at a time.
How long after laser treatment can I see?
Visual recovery after treatment is rapid. Most people achieve good vision the day after surgery and find that their eyes feel fairly normal 24 hours later. You will be able to resume your routine activities like driving, watching T.V, Reading and working on the computer within 2 days. However, your sight will improve even further, and the very best vision could take two weeks to achieve.
Will I need reading glasses after the treatment?
Generally, patients under 40 years of age read well without glasses following the treatment. Patients over 40 may need magnification for reading fine print. Presbyopia is the term that refers to the natural weakening of the focusing muscles that occurs in our early to mid 40s, causing us to need the magnification that reading glasses provide.
How soon can I use eye makeup?
You may resume wearing eye makeup starting 3-4 weeks after your treatment. We strongly recommend that you purchase new eye makeup, specifically mascara, to avoid potential infection following your treatment.
Can I get LASIK done if I am pregnant or lactating ?
NO. LASIK should be avoided during pregnancy and lactation.
How soon after the treatment can I exercise?
Non-contact sports can be resumed as soon as you feel capable. Eye protection is always recommended for racquet sports or rough sports where there is a risk of being hit in the eye.
Can I see the treatment as it is being performed?
You will be "awake" but very relaxed. You will not be able to see any of the details of the treatment. You will see a number of lights, but the images will be blurred.
Will I experience pain after the treatment?
Some patients experience a feeling of burning or scratchiness. This feeling generally lasts from one to three hours following the treatment. Most people feel fine soon after the treatment.
When can I go back to work?
Most patients are back to work full-time the day after treatment. An additional day or two is rarely required before returning to work. If you can we, recommend that you take it easy for a couple of days.
How long will it for me to work comfortably on computer after LASIK ?
Initially you should use computers for shorter durations. Slowly, the durations of use can be increased with frequent breaks in between to give rest to the eye. Religious application of lubricating drops is very essential.
Will the appearance of my eyes change after LASIK ?
NO. LASIK does not change the appearance of the eyes.
How much does LASIK cost ?
The cost of the procedure will depend upon the technique of flap-making, the results of the tests and the type of LASIK laser setting required. The total cost is explained during the counselling.
What is the Success Rate for the Lasik Procedure?
Success Rate depends on several factors, the most important being the degree of nearsightedness, farsightedness or astigmatism. Depending on the prescription, the surgeon can help determine the likelihood of reaching 20/20 Approximately 95 percent of eyes treated with LASIK reach 20/40 or better vision with one procedure, which is the requirement for driving legally without correction.
WHY LASIK AT SHRADDHA EYE HOSPITAL WITH DR PIYUSH UNADKAT ?
At Shraddha Eye Hospital , you can get the advantage of the very best of technology in the most experienced hands. There has been continuous process of upgradation of our software in trend with the latest developments in technology. 1.ZEISS MEL 80 EXCIMER LASER 2. ZEISS ATLAS TOPOGRAPHY 3.MORIA MICROKERATOME (SAFEST MICROKERATOME)