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Laser Eye Surgery Technology
Wavefront Technology |
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The Eye’s Optical System
Clear vision is the result of light entering the cornea (clear window of the eye), passing through the lens inside the eye and coming to a single point of focus on the retina. The most common types of visual distortions are nearsightedness, farsightedness and astigmatism. |
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Nearsightedness
Nearsightedness occurs when the cornea is too steep or the eye is too long. This causes light rays entering the eye to bend too much, coming to a point of Focus before they reach the retina. People who are nearsighted have difficulty seeing distant objects. |
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Farsightedness
Farsightedness occurs when the cornea is too flat or the eye is too short This prevents light rays entering the eye from bending enough to come to a point of focus on the retina. People who are young and farsighted can often see at a distance but have difficulty seeing close objects. |
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Astigmatism
Astigmatism occurs when the cornea is shaped like a Rugby Ball, steep in one direction and flat in the other direction. This causes light rays entering the eye to focus in multiple points within the eye, causing double and/or blurred vision. People who are nearsighted or farsighted also commonly have astigmatism.
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Advances in Laser Eye Surgery Vision Correction
Excimer lasers have been used to correct the nearsightedness, farsightedness and astigmatism of over six million people worldwide. An estimated 98% of these patients are now seeing 20/20 to 20/40 without glasses. Because of heavy demand for laser eye surgery vision correction, surgeons and laser manufacturers have been inspired to make tremendous advances in three key areas:
- Improving the precision of the excimer laser
- Measuring all of the eye’s optical distortions
- Personalizing laser eye surgery treatment to match each eye’s unique optical characteristic
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WaveFront LadarVision CustomCornea
Until now, conventional laser eye surgery vision correction, like glasses or contacts, could only correct visual distortions known caused by neasightedness, farsightedness and astigmatism. However these three common types of visual distortions called "lower order aberrations" might only be responsible for 75%-90% of the overall quality of your vision but there are other imperfections in your eye's optical system that may affect the clarity of your vision and how well you see at night or in low light.
These visual distortions are known as "higher order aberrations", which can cause glare, shadows, halos and other annoying visual effects.
When these higher order aberrations are addressed along with the lower order aberrations, the quality of your vision can be optimised.
This image shows what an eye chart would look like if "higher order aberrations" were present after conventional laser vision correction. Although the person can identify the 20/20 line, the quality of his or her vision would not be ideal as the letters are not crisp and clear.
Now, thanks to advanced Wavefront technology, it's possible to measure and address both lower and higher order aberrations. The goal of CUSTOMCORNEA is to give you a better result than conventional laser eye surgery vision correction by improving the quality of your vision and the quality of your lifestyle. The LADARVision system is proven to deliver results better than conventional laser eye surgery vision correction.
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Eye Movement with Tracker off |
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How Your Laser Eye Surgery Treatment is Customised
First, flat waves of light are passed through your eye using a computerised wavefront-measuring instrument called LADARWave. As the light waves travel through your eye's optical system, the distortions in your vision are measured. LADARWave captures the distorted waves as they exit your eye and compares them to the perfectly flat light waves that would have been reflected if your optical system had no distortions. Next a 3D map is generated representing your unique visual distortions, including both lower and higher order aberrations. This map is a guide for the laser, telling it where to reshape your cornea to correct your vision.
On the day of your laser eye surgery, the wavefront map containing the aberrations of your eye is perfectly registered and aligned with the surface of your cornea. Then the LADARVision radar eye tracker tracks eye movement 4000 times per second and guides the small spot laser beam to precisely reshape your cornea.
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Eye Movement with Tracker on |
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The Radar Tracker and 0.8mm Flying Spot Beam
Excimer lasers, now in their second decade of use, have brought a tremendous amount of precision, control and safety to laser vision correction.
Truly precise laser eye surgery relies upon accurate placement, but your eyes are constantly moving, that's why our clinic has invested in LADARVision 4000, with radar tracking.
The RADAR tracker eye tracking system uses laser and radar technology originally developed for NASA which can track and compensate for eye movement 4,000 TIMES PER SECOND to ensure accurate placement of the beam.
LADARVison's cool, small spot laser beam (0.8mm in diameter) allows micron size reshaping, just like a fine brush is used for details when painting a picture.
- Precise
- No surrounding tissue damage
Eye trackers need to sample at a rate of at least 1,000 times per second in order to keep up with involuntary eye movement.
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Lasered Human Hair
Shows the accuracy of the 0.8mm Flying Spot Beam |
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