LASIK

LASIK Laser surgery, is  a time tested laser surgery which aims at reducing one’s dependence on glasses or contact lenses.

Patients from all walks of life, who wear glasses or contact lenses but wish to have better vision without glasses can avail this facility at our Eye Hospital.

At H. V. Desai Eye Hospital – LASIK Department, we ensure detailed patient evaluation and education before planning LASIK surgery.

The LASIK Procedure: A Complete Guide+
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LASIK

LASIK, or “laser-assisted in situ keratomileusis,” is the most commonly performed laser eye surgery to treat myopia (near sightedness), hyperopia (farsightedness) and astigmatism. Like other types of refractive surgery, the LASIK procedure reshapes the cornea to enable light entering the eye to be properly focused onto the retina for better and clear vision.

In most cases, laser eye surgery is pain-free and completed within 15 minutes for both eyes. The results are – improved vision without eyeglasses or contact lenses – can usually be seen in as little as 24 hours.

In the case where, one is  not a good LASIK candidate, a number of other vision correction surgeries are available, such as PRK and LASEK laser eye surgery and Phakic IOL surgery.

The ophthalmologist, will determine if one of these procedures is suitable for one’s condition and, if so, he will determine which technique is the best suited, for the individual.

What are the types of LASIK surgeries performed?+

LASIK Surgery: in simple terms, is where the number of one’s  spectacle  is fed in LASIK machine and the LASIK machine, with apply laser, considering a normal cornea of standardised shape.

 

Customised LASIK Surgery: in this surgery an advanced software is used to maintain relative shape of cornea and accordingly laser is applied giving a better contrast vision and better night vision. This is a more widely accepted method.

 

Wavefront guided / Topography guided LASIK Surgery: in this type of lasik surgery, if the patient has any other visual imperfections, then these are also corrected. This procedure is required in special cases. Your LASIK surgeon will advise you based on your reports.

How Is LASIK Surgery Performed?+
First, your eye surgeon, uses either a mechanical surgical tool called a microkeratome to create a thin, circular ‘flap’ in the cornea.

The surgeon then folds back the hinged flap to access the underlying cornea (called the stroma) and removes some corneal tissue using an excimer laser.

This highly specialized laser uses a cool ultraviolet light beam to remove (“ablate”) microscopic amounts of tissue from the cornea to reshape it, to enable it to accurately focus light on the retina for improved vision. For near sighted people, the goal is to flatten the cornea; with farsighted people, a steeper cornea is desired. Excimer lasers can  also correct astigmatism, by smoothing an irregular cornea into a more normal shape.

It is a misconception that LASIK cannot treat astigmatism. After the laser reshapes the cornea, the flap is then laid back in place, covering the area where the corneal tissue was removed. Then the cornea is allowed to heal naturally. Laser eye surgery requires only topical anaesthetic drops, and no bandages or stitches are required.

Before LASIK Surgery+

Your doctor will perform a thorough eye exam to ensure that your eyes are healthy enough for the procedure. He or she will evaluate: the shape and thickness of your cornea; pupil size; refractive errors (myopia, hyperopia and astigmatism); as well as any other eye conditions, that may be pre-existing. The best candidates are one’s who have mild/moderate myopia, hyperopia and/or astigmatism, adequate corneal thickness.

  • Procedure time: about 10 minutes per eye.
  • Typical results: 20/20 vision without glasses or contact lenses.
  • Recovery time: a few days to several weeks for vision to stabilize. The moistness of your eyes will also be evaluated, and a precautionary treatment may be recommended to reduce your risk of developing dry eyes after LASIK.

    Usually, an automated instrument called a corneal topographer is used to measure the curvature of the front surface of your eye and create a “map” of your cornea. With wave front technology associated with custom LASIK, you are also likely to undergo a wave front analysis that sends light waves through the eye to provide an even more precise map of aberrations affecting your vision.

    Your doctor will also note your general health history and any medications you are taking to determine if you are a suitable candidate for LASIK.

    You should stop wearing contact lenses for a period of time as advised by your doctor (typically around two weeks) before your eye exam and before the LASIK procedure, as contacts can alter the natural shape of your cornea.

What To Expect During LASIK+

Before your surgery begins, numbing eye drops are applied to your eye to prevent any discomfiture, during the procedure. Your doctor may also give you some medication to help you relax. Your eye will be positioned under the laser, and an instrument called a lid speculum is used to keep your eyelids open.

The surgeon uses an ink marker to mark the cornea before creating the flap. A suction ring is applied to the front of your eye to prevent eye movements or loss of contact that could affect flap quality. After the corneal flap is created, the surgeon then uses a computer to adjust the excimer laser for your particular prescription.

You will be asked to look at a target light for a short time while he or she watches your eye through a microscope as the laser sends pulses of light to your cornea. The laser light pulses painlessly reshape the cornea, although you may feel some pressure on your eye. You’ll also hear a steady clicking sound while the laser is operating. LASIK is performed on each eye separately, with each procedure taking only about five minutes duration.

Immediately After LASIK Surgery+

Upon completion of your LASIK surgery, your surgeon will request you to  rest for some time. You may feel a  burning or itching sensation immediately following the procedure, which is temporary. After a brief post-operative exam, you are allowed to go home though you cannot drive your vehicle, unless and until the follow up, the next day, wherein your  doctor, will examine your eye and confirms whether your uncorrected vision meets the legal standard for driving.)

You might experience blurred vision and haziness immediately after surgery; however, clarity should improve by the very next morning. Your eyesight will stabilize and continue to improve within a few days, although in some cases it may take several weeks or longer, which is rare. Most people, undergoing Lasik surgery, experience vision improvement almost immediately.

You may be able to go to work the next day, but  doctors do advise a couple of days of rest, for natural healing. Also, it is usually recommended that you refrain from any strenuous exercise for at least a week, since this can traumatize the eye and affect healing. Generally, you are to consult your doctor or your LASIK surgeon the day after surgery.
 

As with any other surgery, you are advised to  follow your doctor’s instructions and take any medication prescribed. Also, one must avoid rubbing one’s  eyes, as there exists  a small chance, that this action could dislodge the flap, before its proper healing and adheres more securely to the underlying cornea.

Advancing excimer laser technology+

The use of excimer laser technology in refractive surgery started  in 1986 – with ZEISS. The MEL® 90 carries that legacy forward. Successfully combining years of expertise and innovative performance features, it offers users a highly rewarding  experience of handling the same. It is specially designed for the needs of the modern refractive surgeon, the ZEISS MEL 90 incorporates proven safety as well as individually configurable options. Unique product qualities like the FLEXIQUENCE® switch function (250 Hz / 500 Hz), the ablation profile Triple-A and the outstanding intra-operative ablation speed of up to 1.3 seconds per diopter create entirely new treatment prospects.

FLEXIQUENCE: Applied flexibility

A true novelty – the FLEXIQUENCE switch function lets you flexibly choose between 250 Hz and 500 Hz frequency. It allows you to combine your previous clinical experience with excimer technology as well as the innovative advantages of the MEL 90. In fact, you can have twice the speed in a fraction of a second with a simple touch of the finger – enabling you to leverage both proven reliability and new treatment opportunities.

Triple-A: Predictable and gentle

The MEL 90 also features the Triple-A Advanced Ablation Algorithm. As a single ablation profile for a wide range of sphero-cylindrical (SCA) corrections, it simplifies treatment planning. Triple-A offers a high degree of precision and predictability. In addition to intelligent energy correction, it comprises an aspherically optimized design that also focuses on minimal tissue removal. This results in, not only gentle standard of treatment, but also eyes having higher and lower level of ametropia. All combined into one single ablation algorithm: Triple-A.