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Links to all Houston LASIK surgeons websites. Read articles by Houston Refractive Surgeons about LASIK laser eye surgery and common eye ailments.

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    Custom LASIK With Care
    The Allegretto Wave dramatically minimizes night vision reduction, glare, and halos

    John D. Goosey, M.D.
    Houston, TX

    Allegretto Wave’s revolutionary approach to laser vision correction minimizes problems associated with older generation lasers, such as night vision reduction, glare, and halos.

    The success of the Allegretto Wave can be directly measured by our patients’ remarkable improvement in visual acuity and low occurrence of side effects.

    Smart energy control and eye tracking technology combine to provide an ultra-fast solution to laser vision correction. Innovative and redundant safeguards make Allegretto Wave a leader in the field.

    PerfectPulse Technology represents a new approach to laser vision correction – it accounts for speed, precision, and safety in the Allegretto Wave laser and offers improvements that are revolutionary in the field. Smart energy control measures and adjusts energy levels in the laser pulse from creation to delivery. High-speed eye tracking charts the eye’s movement 200 times per second. As a result, every laser pulse is completely controlled and accurate, achieving the most accurate level of correction possible.

    You can have peace of mind that the amount of energy in the laser has been calibrated to exactly the right level. After the beam has been created, it passes through three checkpoints on its way to your eye. At each of these points, the energy level is checked and adjusted if necessary, ensuring that the beam is perfectly attuned at its destination.

    Allegretto Wave’s laser is essentially a precise, controlled beam of energy, which translates to heat. To make sure that this beam never causes any sort of adverse heating effect on the cornea, Allegretto Wave’s PerfectPulse Technology™ places the laser pulses in such a way that only every fifth pulse overlaps. Not only does this preclude unwanted heating effects, it is one of the ways that Allegretto Wave achieves a rounder, more natural corneal surface than many other lasers used for vision correction.

    Eye Tracking Technology

    Due to the remarkable speed of both the eye and the Allegretto Wave procedure, the laser beam needs to be constantly and minutely adjusted to the position of the eye at any given time. Every 4-6 milliseconds, the eye’s location is measured and the internal mirrors of the Allegretto Wave are automatically aligned. Right before the pulse is released, a second check is made to confirm that the eye has not moved. This happens 200 times every second, once for every laser pulse released. If, at any time, the eye moves too quickly to be measured or moves out of range, the laser will stop and wait for the eye to move back into position.


    Currently, the Allegretto Wave is the fastest vision correction laser available in the United States. At 200 laser bursts per second, it only takes about four seconds of treatment to correct one diopter. Of course, spending less time under the laser means less stress and discomfort for the patient.

    Wavefront Mapping

    One of the most innovative features of the Allegretto Wave is the way it uses wavefront-optimized technology to automatically compensate for the curvature of the cornea. In earlier laser correction systems, the “optical zone,” or area of correction, was centered on the front of the cornea; the result was a flattened circular area that ended with an abrupt edge, causing unwanted side effects like poor night vision, glare, and halos.

    Allegretto Wave changes all that. Understanding that the cornea is a sphere, Allegretto Wave uses a proprietary treatment that is adjusted to the patient’s individual corneal curvature. The Allegretto Wave sends extra pulses to the peripheral cornea area in order to compensate for the angle of the laser. In this manner, the spherical shape of the cornea is preserved to a degree that older lasers simply could not achieve. This compensation, combined with the incredibly small, 1mm size of the laser, produces a smooth, effective optical zone that produces what can only be described as high performance vision.

    Imagine a glass ball. If you took a flashlight and aimed it directly at the top of the ball, the light would form a circular shape on the surface of the ball. If you now aimed the flashlight towards the side of the ball, the light would form an elliptical shape and not seem as bright anymore. This is because the same amount of light is suddenly distributed over a larger area and some of the light is reflected away due to the angled surface of the glass ball.

    Allegretto Wave is capable of producing some of the largest available optical zones. The optical zone refers to the portion of the cornea that has been corrected by the laser. A larger than normal optical zone is especially important for night vision, and for patients with very large pupils. If a patient’s pupil is larger than the optical zone, they may experience poor peripheral vision, poor night vision, and a higher than normal incidence of “halos” and glare. In the past, this has been one of the biggest drawbacks to conventional laser correction surgery.

    Better Night Vision and Glare Control

    At night and in dark conditions, the pupil becomes larger to permit the maximum amount of light to enter the eye. Laser eye correction needs to take this fact into account. If the optical zone is smaller than the size of the pupil at its largest, there is a good chance that the patient will experience poor night vision or problems with glare and halos around bright objects such as oncoming headlights. Allegretto Wave is able to produce the largest available optical zone, virtually eliminating glare and night vision problems associated with older generation lasers.

    Clinical Results

    When it was approved in 2003 as the first new laser in five years, the FDA granted Allegretto Wave the widest approval range ever initially given to a new laser for both myopic and hyperopic vision correction. Since then, the results have been astoundingly positive. Allegretto Wave has been proven to provide superior clinical results, as shown by the following statistics:

  • At one year after treatment, more than 93% of patients said they saw at least as well or better than they had with glasses or contacts before treatment.
  • More than 98% of patients achieved 20/40 vision one year after treatment; 20/40 is the level of visual acuity required to pass most driving tests.
  • Nearly 60% of near-sighted patients achieved 20/16 vision after one year of treatment.
  • Both near- and far-sighted patients reported an improvement in their reaction to bright lights and night driving glare after Allegretto Wave treatments. In addition, near-sighted patients reported an improvement in sensitivity to light.
  • Predictable results are the norm for the Allegretto Wave. More than 90% of patients achieve refraction within 1 diopter of their target correction.
  • The Allegretto Wave has a total re-treatment rate of less than 5% of patients.

    Is Allegretto Wave right for me?

    Allegretto Wave expands the boundaries of candidacy for LASIK. However, there are certain people who are less than ideal candidates for LASIK and Allegretto Wave. These patients are encouraged to speak with their doctor to find the best vision correction option:

  • Under age 21
  • Pregnant or nursing
  • Glaucoma or high blood pressure
  • Keratoconus, a corneal irregularity
  • Inflammation of the eye (uveitis, blepharitis, or iritis)
  • Herpes simplex that has infected your eye
  • Previous severe injuries to the eye
  • Corneal scars or infections
  • Unstable refraction
  • Other diseases of the eye such as AMD, diabetic retinopathy, cataracts, or others
  • Patients with very large pupils, thin corneas, or dry eyes

    During the consultation with your doctor, please be sure to mention all medications you are taking and any medical conditions you have that might affect the success of laser correction.

    If you would like to learn more about Allegretto Wave LASIK/Refractive surgery, visit our website at or call our LASIK coordinator at (713) 558-8777 and schedule a free screening where I can personally answer your questions.

    Dr. John D. Goosey

    Dr. John Goosey graduated from the Medical University of Charleston, South Carolina where he received his Medical Degree. After graduating, he completed a one-year fellowship at the National Institute of Health in Bethesda, Maryland, where he extensively studied the mechanism for cataract formation and treatment. Following this, Dr. Goosey completed a three-year residency at the University of Texas, Department of Ophthalmology in Houston. He completed another fellowship at Louisiana State University Eye Center, where he received his sub-specialty training in corneal and external disease.

    Dr. John Goosey is nationally board certified and internationally known and respected as a corneal and refractive surgeon. In 1993, he began studying the use of lasers for the correction of nearsightedness (myopia), farsightedness (hyperopia) and astigmatism. He has experience with several different laser and surgical techniques. Today he is the premier LASIK surgeon in Houston, having performed tens of thousands of operations. He has previously been named among The Best Doctors in Houston by Inside Houston magazine. He has been listed as one of The Best Doctors in America for 2005-2006.

    Over the past year, Dr. Goosey has been presenting his work on corneal transplantation and refractive surgery, at the 2005 World Cornea Congress in Washington, DC, the 2005 European Refractive Society in Lisbon, Portugal, the American Academy of Ophthalmology in Chicago, and the 2006 Pan American Ophthalmology Congress in Sao Paolo, Brazil. He has written numerous medcical textbook chapters on innovations in corneal transplantation for the training of resident ophthalmic surgeons and ophthalmic fellows.

    Dr. Goosey and his wife Claire have been married for thirty-two years and have two children, Leslie and Johnny. Dr. Goosey is an avid tennis player and together with his wife, Claire, actively support tennis activities in Houston.

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