Procedures – CustomVue wavefront PRK
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This procedure is done if not enough corneal tissue is available to do your correction safely after creating a corneal flap for LASIK. This is also done for patients involved in sports like boxing or kick boxing. Certain occupations (like law enforcement) where injury is a possibility prk is a good option.
Your best personal vision with PRK is done in 3 steps.
The 3 steps of PRK are:
Step 1 Creating Your Personal Vision Profile for your best personal vision
Step 2 Removing the epithelium to expose corneal tissue
Step 3 Advanced Customlaser correction using Visx Star S4 IR Excimer Laser
Step 1 – CustomVue™ WaveScan Wavefront®
The first step in the PRK procedure is to perform a series of tests to determine the individual characteristics of your vision, including the use of our WaveScan™ technology. Your correction in your glasses is not unique. Glasses and contacts are limited in their ability to correct unique imperfections in each individual’s vision. In fact, millions of individuals have the same eye glass prescription. With the CustomVue procedure, no two “prescriptions” are identical. The WaveScan system creates a 3-D map of the unique imperfections of your eyes. Then our Advanced CustomVue™ process uses the digital information from that map to design a custom treatment for each of your eyes. The wavefront analysis for each eye is very unique for you and only you.
Other systems use similar equipment to customise your vision. The big difference is the other laser analyses 78 points on the whole cornea and our system measures 240 points in a 6.5 mm pupil area. We get more data to do more refined custom correction. Most other systems analyse up to 4th or 5th order of wavefront abnormalities. Visx CustomVue WaveScan measures up to and beyond 8th order abnormalities. Our system is the only one calculating the data by Fourier mathematical analysis to give you the best possible personalised vision correction.
Fourier-based wavefront algorithms:
- Fourier delivers the highest resolution available of the wavefront error
- Uses more data points to derive the optimal shape
- Uses all data from any shape of pupil
- Accurately reconstructs all peripheral data
- Captures and treats higher and lower order aberrations up to 7 mm diameter pupil
Imagine the personalisation you can get with our system! It is all here for you.
Step 2 – Removing epithelium to expose corneal tissue
In this procedure no corneal flap is created. The superficial layer of cornea is called epithelium. This layer is constantly replaced as this layer is rubbed constantly by the eyelids blinking regularly. This epithelium is removed by a revolving soft circular brush or exposing the tissue to 20%alcohol for 20 seconds. This will expose the proper corneal tissue for your personalised correction
Step 3 – Your Laser Vision Correction
Now that you’ve had your personal vision profile using WaveScan technology and your corneal tissue is made ready for your correction, your vision will be corrected using the Advanced CustomVue treatment with Visx Star S4 IR Excimer laser. Your personalised correction data is transferred to the computer of the laser delivery system. A “speculum” is used to prevent your eyelids from closing during the procedure. The exposed corneal tissue is treated with the Excimer Laser. Advanced CustomVue treatment corrects the broadest range of vision imperfections possible – nearsightedness, farsightedness and all types of astigmatism. The treatment time is very short and it takes only seconds to deliver the treatment precisely. The 3d tracking system and Iris registration makes your best personalised vision precisely done even if you move your eyes during the procedure. If the eye wanders out of the tracking area the laser delivery automatically stops. The Iris registration also compensates for circular rotation of the eyes which normally occurs when you lie down. Other lasers don’t have this feature. The Visx Star S4 IR laser has the following unique features which makes it more advanced than other lasers:
- Variable spot scanning (vss): variable beam sizes from as small as 0.65 mm up to 6.5 mm scanned over the treatment area, conserving tissue and optimizing treatment times. The different size spots literally dance on the corneal surface sculpting your personal best vision just like an artist using different brush strokes-some broad some fine.
- Variable repetition rate (vrr): vrr delivers treatment at varying repetition rates, optimizing treatment time and prevents pulse stacking and heating.
- ActiveTrak 3-d active eye tracking: captures all 3 dimensions of intra-operative eye movements. Your cornea is dome shaped so this 3 dimensional tracking and delivery is critical. Other lasers don’t have this 3d tracking.
Iris registration: locates the pre mapped iris land marks in your WaveScan and then automatically sets the treatment precisely placed. This iris registration is not present with other lasers. After the procedure a contact lens is placed on the cornea. You will be followed up regularly till the epithelium regenerates and covers the treated area completely. This takes about 3 to 4 days. The contact lenses are now removed and you will be starting on FML eye drops. You have to use FML eye drops for a few weeks. You will be`seen at the clinic at regular intervals till you are off these eye drops. It is very important you are seen every 3 to 4 weeks till you are off the FML eye drops.
Eyetech Lasik is a leading Winnipeg Laser PRK treatment clinic. Located in Winnipeg Manitoba, our LASIK eye surgeon, Dr. Desikan R. Kadambi is one of the most renowned and experienced Winnipeg laser eye surgeons. Using state-of-the-art Bausch & Lomb LASIK eye surgery technology we deliver the highest standard of PRK surgery at an affordable price. The cost of PRK and the cost of Laser eye surgery is low compared to the wonderful benefits you’ll receive. Few patients report serious problems from Lasik eye procedure, and most are delighted with the quality of their improved vision.
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