This is my video diary. I will continue to add parts as I go along. My procedure is booked for 26th May 2011. Feel free to comment, leave advice, or even if your thinking about having it done, etc. Thanks For Watching 
This is my video diary. I will continue to add parts as I go along. My procedure is booked for 26th May 2011. Feel free to comment, leave advice, or even if your thinking about having it done, etc. Thanks For Watching
In this video, Mr Paurush Sharma discusses his experience of undergoing AMO VISX CustomVue Wavefront-guided lasik Laser treatment done on Nov. 7, 2011 at SuVi Eye Insttute, Kota, India. The Lasik Refractive Eye Surgery was performed for myopia by Dr Vidushi Sharma & Dr Suresh K Pandey atSuVi Eye Institute & Lasik Laser Center, Kota, Rajasthan, India ( E-mail- suvieye@gmail.com, www.suvieye.com). Installed as the first Visx Lasik machine in the state of Rajasthan, India, the AMO STAR S4 IR™ Excimer Laser System is designed to bring Advanced CustomVue™ laser vision correction to life. The VISX STAR platform’s heritage of dependability and performance is well known. The STAR S4 IR from VISX has taken that reputation to an even higher level. The AMO Visx latest excimer laser system represents the most advanced laser technology platform available today. Integrating data collected by the WaveScan WaveFront System, the STAR S4 IR utilizes these exclusive VISX technologies to deliver precision custom ablations: •Iris Registration (IR): The first FDA-approved, fully automated, non-contact method of alignment of the correct CustomVue treatment to the corneal site •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 •Variable Repetition Rate (VRR): VRR delivers treatment at varying repetition rates, optimizing treatment time •ActiveTrak 3-D Active Eye Tracking …
Lasik Intralase with Dr. David Schanzlin at the Shiley Eye Institute La Jolla, CA.
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Many eye surgeons use the wavefront-guided VISX system, which is known as CustomVue. The Iris registration is a hardware upgrade installed on this system.
Wavefront-guided LASIK
It’s also called Custom LASIK, for good reason.
In the diagnostic stage the wavefront system takes many measurements of each cornea in tiny detail. From these, it makes 3_D maps, which it displays on the system’s computer monitor. The information contained in these maps is used to calibrate the laser for treatment.
Nobody else in the world has eyes exactly like yours. These maps are created in such tiny detail that they can’t be mistaken for anybody else’s, and the laser treatment based on them will be unique to you. It’s an entirely customized treatment.
A small Achilles’ heel in Custom LASIK
In between the time the eyes are diagnosed and mapped by Wavefront-guided LASIK, and the time of treatment, if the eyes change at all, the laser needs to be adjusted to match.
Eye movements
When you lie down for your treatment on the patient bed that’s part of the wavefront unit, you’re moving your eyes from a vertical to a horizontal orientation, and in that change, sometimes the eyes rotate, which is called cyclotorsional movement.
The eyes could make other movements too, in between the mapping stage and the treatment:
The size of the pupil can change if the ambient lighting changes
The head may turn slightly to one side
That means that the measurements done on your eyes while you were sitting will be very slightly wrong now that you’re lying down for treatment. The wavefront diagnostic information needs to be slightly modified to align the laser to the eyes’ new positions.
Previous ways of aligning treatment
Your eye surgeon needs a reference point for aligning the laser during treatment. In the past there have been two ways of setting the reference point:
1. Manual – with a sterile pen, the eye surgeon made tiny marks on the cornea to indicate where the laser would be focused during treatment. At the time of treatment, he manually positioned the patient’s head so as to line the laser up with the marks.
This method was prone to human error at times. Also, the ink used to make the marks was short-lived, drying up after a minute or so.
2. Semi-automatic – The outlines of both the pupil and the iris were used as reference points and with the eyes dilated to enlarge the pupil, tiny marks were manually made outside the iris to indicate where treatment should be focused.
This method took longer, as the eyes had to be dilated, and it also allowed human error to creep in at times.
Automatic iris registration
The outside boundary of the iris does not change, only the inside boundary when the pupil changes size. So iris registration uses the center of the pupil as the reference point, targeting the laser beam on that center, as it relates to the outside of the iris.
During treatment, the Wavefront software works with two images of your eye:
The pre-operative image contained in the 3-D map
The present-time image as you’re receiving treatment
If there’s any movement during treatment, it automatically and continuously re-matches the two images to each other, causing the laser to re-target on the prescribed treatment area.
Because of this continual automatic readjustment of the laser, your eye surgeon can treat exactly those areas which his or her diagnostic tests revealed as needing treatment.
The Lasik surgery is designed to correct the vision of its patients. The most vital part of the surgery is the correlation between the information related to the patients’ visual system and the Lasik laser. The flap modeling by cutting patients’ cornea is designed to meet patients’ needs. This brand new technology is the best technique to gather all this crucial information.
Introducing the Wavefront Technology
Wavefront is a technology aiming at providing a good measure of refraction at various spots belonging to our eyes as a light source is traversing it. The process outputs a map of artifacts which acts as a fingerprint of patients’ eye due to the uniqueness to the patients.
Refraction can be affected by some conditions related to the cornea. For instance high-order aberrations have always been related to astigmatism. A correction of these aberrations will definitely improve the outcome of the surgery. Results such as an improvement factor of 20/20 can then be achieved. Wavelength technology reduces the possibility of losing best-corrected vision or visual quality as well as night vision. Indeed, clinical surveys clearly revealed that about 80% of Lasik patients recorded a 20/20 vision.
Moreover, Wavefront technology can be used to reveal good candidates of Lasik surgery. For bad Lasik candidates, the surgery can decrease existing visual problems.
Wavefront Technology Applications
There are two types of corneal abnormalities: cylindrical and spherical. Astigmatism is caused by a cylindrical abnormality whereas nearsightedness (also called myopia) and farsightedness (also hyperopia) are both caused by spherical abnormality.
Wavefront Technology when properly used can reveal an infinite many abnormalities. This is done by making use of a fixed objective along with an input laser beam. This beam creates light, which in turn is a wavefront sensor aiming at working out the slope of the wavefront as it quits. The dedicated software then works out the excimer ablation’s properties.
The visual fixed objective is then used to aid the patient keep the correct view while the measurement is being computed. The laser beam will sparkle into the patient’s eye when she fixates.
When the laser beam goes into the eye, it generates a wave front having a planar surface. With a flawless eye, an undistorted wave front will reflect back. In practice, this beam of light will travel through an imperfect crystalline lens. The light then traverses a distorted cornea as well as other sections of the eye. The combination of all these will allow the wave front to get distorted bringing about substantial amount of data to find out the exact form of the cornea. The wave front is used to detect any abnormalities related to the eye in order to transform the cornea.
At the beginning of Wavefront Technology
The Wavefront Technology was created very long time ago and is used nowadays to help correct the human vision. Astronomers were the pioneers in using this technology especially for enhancing the vision in their telescope devices for similar purposes. As soon as the mirror responsible of reflecting gets distorted, it can be tweaked with available data. These data sets are also used to get rid of abnormalities such as our atmosphere. There is analogy between this process and the one related to our eyes.
The different options of the Wavefront technology
In the US, there are basically 3 wavefront vendors namely CustomVue (Visx S4 laser), CustomCornea (Alcon LADARVision laser), and Zyoptix (Bausch & Lomb Technolas 217z laser). Any vendor can make a suitable prescription for a given patient.
The Wavefront technology is a brand new technology aiming at creating precise and unique prescriptions for patients undergoing the Lasik surgery. With this Technology, Lasik patients are more likely to experience a successful surgery.
CustomVue lasik is not only the best and latest procedure for laser eye surgery, but it encompasses all the best techniques to give the patient the best possible results available.
The advanced CustomVue lasik equipment is manufactured with FDA approval by Abbott Medical Optics. This is a well known and trusted company that has been in medical industry for many years.
The CustomVue lasik procedure utilizes the equipment from Abbott Medical Optics because of its outstanding level of precision and accuracy. In easy to understand words this means it makes the right cut in length and in the right place every time. The procedure uses the Iris registration along with the Fourier algorithm calculations to not only find but to correct all imperfections of the eye lens. This advanced technology has been perfected to the point that over 94 percent of the American population can have beneficial results with this procedure.
The early days of Lasik was filled with horror stories from patients that had night blindness, halos around lights and star vision after their surgeries. This is when the old mechanical microkeratome scalpel was used. The CustomVue lasik technology and equipment has taken the guess work and judgment of the surgeon out of the equation.
A reason this technology is so perfected is that it has been in use for many years before being applied to laser eye care. Astronomers need a way to correct the shape of their mirrors on their telescopes. The wavescan technology that is used in the CustomVue technique is directly from this decade old technology.
By trusting the CustomVue lasik technology and procedures your vision is utilizing the same scientific theories and principals that professions use to gaze at the stars and into heaven.
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