Aberrations after a Refractive eye surgery are one of the most challenge and controversial topic to study. In a few cases can be prevented with the proper calibration of the Excimer Laser.
Aberrations after a Refractive eye surgery are one of the most challenge and controversial topic to study. In a few cases can be prevented with the proper calibration of the Excimer Laser.
The latest Excimer technology certainly give you better outcome after all but combined this tech with appropriate education can play an important roll in an successful procedure.
Let's take a moment here, to be very precise of what is happening with accurate outcomes and Excimer Laser tech.
Most surgeons will agree that technology matters, because outcome are better with latest technology, obviously the doctors who do not have the latest tech, will say that is not true. We wonder how they can tell, if they have not used? While those who already performed surgery with this tech, are today experiencing with superior tech. The true is that most patients who are interested on LASIK surgery, they are not aware about the kind of Technology the doctor will perform the surgery, and we believe that the simple reason is because that information is "very exclusive" nor easy to find or they have no idea where to find it. But over the years, people want to know more details about LASIK surgery, particularly because they have heard many bad rumors, precautions in the news and even websites are online to prevent more tragedies, according to them. But watching these videos and websites, we concluded that many of them, give a wrong message to the patient and the information is distorted, which in the end does not do more than create fear and distrust.
20/20 is more than number or more than you can read at 20 feet a letter that most human beings should be able to read at 20 feet.
20/20 means quality vision means sharp and clear, and as you know 20/20 is part of a metric vision scale. In this scale we can find 20/10, 20/15, 20/20, 20/25 and so on, up to count fingers, but did you know that in your chart, doctors must complete with precisely information in order to give the right treatment or diagnosis, so maybe they can tell you that after surgery your are 20/20, because technically you are, but the all true is that in your chart maybe goes 20/20 -1. What is that means? That's mean that you have a misread in one of the letters of the 20/20 line. Most common misread are on C, G, O, E, B, F, P.
Now many patients, who have done the procedure, have different viewpoints or concept about vision. Most of the people who are complain about loss quality vision, they compare inappropriately two different things. For instance a patient that has a refraction of -2.00 -1.25 x 90, means cylinder is -2.00, astigmatism -1.25 and axial is 90. That means the patient has blurry vision to see distance but also distorted vision, and we can guarantee that this patient can not recognize a person even 5 steps at front of him/her with out glasses or contact lenses and his/her vision acuity is probably 20/60. But with glasses or contact lenses can correct his/her vision up to 20/20, maybe even better 20/15.
Now most patients who are complain about loss quality vision after LASIK procedure, compare their previews quality vision with glasses or contact vs. quality vision after LASIK surgery, instead of comparing before LASIK surgery quality vision and after LASIK surgery quality vision, and both with out glasses.
So lets say that the same patient after the surgical treatment has a refraction of -0.25 -0.75 x 130 instead of -2.00 -1.25 x 90. That means the patient definitely improves his/her quality vision, but if he/she compare his/her glasses or contact lens quality vision, which is probably 0 0 0 vs. -0.25 -0.75 x 130, it wont show any improvement.
Now if the doctor said "you vision will be exactly the same than when you wear glasses or contact lenses", simply is not true, especially those patients who have astigmatism, because astigmatism is located on the cornea but also on the intraocular lens, that means the Laser can correct the surface but nothing inside of the eye. In other words if the patient has a total astigmatism of -1.75, and -1.50 is in the cornea, but -0.25 is in the intraocular lens, that means patient will still having astigmatism after LASIK any ways.
But glasses will correct most of the time total astigmatism, not part of it. That is why quality vision can be better with glasses or contact lenses instead of having this particular procedure.
Other very important factor for optimal outcomes in LASIK surgery is the previous calibration of the Excimer Laser, and let's take a moment here to explain exactly how calibration certainly affect outcome.
One of the most important steps previous to LASIK surgery, in order to have good quality vision outcome, is the Excimer Laser calibration, because no matter how good is the surgery performed by the doctor, if the laser is not calibrated properly, the patient can experience some aberrations on the outcome.
The next video will show a NIDEK EC-5000CX III Excimer Laser calibration. This Excimer machine is approved by the FDA to treats: Myopia, Hypermetropia and Astigmatism.
We strongly believe that loss vision quality in some cases is the result of an inappropriate Excimer Laser calibration. Now inappropriate calibration shows aberration result in a device called Lensometer.
Above the video we explain everything in regard it, and we also show what the Lensometer shows under a correct and incorrect calibration.
Video Interpretation:
First of all, is a device connected to the Excimer Laser machine with a flat surface, this device will allow the technologist to put a square surgical plastic in order to fire the pulses of the Excimer Laser, but before the technologist fire the Laser pulses, he/she has to make sure that the surface is on level. Once the surface is level, then he/she proceed to the square plastic, wish is in the same surface, and try to align the two light lines and make them one. Then he/she can precede and fire the Laser. As soon as the laser finish with the first shooting, the technologist can proceed to remove the plastic and read it with a device called Lensometer, how accurate was the shot, then base on what the Lensometer interpret, the technologist must to introduce the information to the computer in the Excimer Laser machine, in order to tell the machine how to make the arrangements for accurate shooting, this process needs to be repeated as many time is necessary in order to have a accurate shot. All these work reduce the risk involve in surgery plus add more chances for a successful surgery as well good outcome.
Emulating 20/20 vision with aberrations and 20/20 with out aberrations
Other Excimer Laser calibration examples
Is a few factors that need to be consider for accurate calibrations, and those are: Periodic maintenance on the Excimer Laser, well trained, Humidity and Temperature of surgical room.
Page updated January 06. 2010
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