Laser Vision Technology

Z500 LASIK with EX500 Technology 

Dr. Iskander constantly researches the latest technologies and advancements in vision. He wants to combine his experience and technology in providing exceptional visual outcomes for all.

Now, he brings another breakthrough in laser vision correction technology to the area with the Z500 excimer laser that can further enhance results. Also known as the EX500 excimer laser, this advanced technology takes LASIK to the next level of speed, precision and accuracy. One of the many advantages of Z500 LASIK technology is speed. The average time it takes to correct 1.0 diopter of correction only takes 1.4 seconds, a remarkably quick process that benefits patients in many ways.

3D Eye Tracking 

The EX500 also has many innovative engineering technologies. For example, the EX500’s multi-dimensional eye tracker can move 10 times faster than the human eye. The 3D eye tracker constantly corrects for eye movement to ensure each laser pulse is placed perfectly.

Widest Treatment Range

The EX500 has one of the widest treatment ranges of any excimer laser, which may allow many patients who weren’t candidates in the past to undergo LASIK or PRK for myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.

Contura LASIK

San Antonio Eye Specialists now offers Contoura Laser Vision Correction technology, the next generation in LASIK which uses the latest WaveLight® topographic-guided laser system developed by Alcon Pharmaceuticals. This is one of the most technologically advanced excimer laser systems available in the United States that uses 22,000 points to map the surface of the cornea.

The Best FDA LASIK Results to Date!

In FDA studies, this laser technology produced the best results compared to previous FDA studies for myopia (nearsightedness) and myopic astigmatism (nearsightedness with astigmatism). U.S.-based clinical trials conducted by Alcon showed that 12 months after surgery 92.6% of eyes that received topography-guided LASIK treatment achieved 20/20 vision or better, 64.8% experienced 20/16 vision or better, and 34.4% could see 20/12.5 or better. The outcomes also showed reductions in some of the visual symptoms associated with LASIK, including glare, light sensitivity, difficulty driving at night, and difficulty while reading.


FDA Study Results: 1-year post procedure:

  • 15.7% of eyes 20/10 or better
  • 31.6% of eyes 20/12.5 or better
  • 68.8% of eyes 20/16 or better
  • 92.7% of eyes 20/20 or better
  • 96.5% of eyes 20/25 or better

iFS LASIK Technology


The iFS® is the latest and most advanced generation of femtosecond lasers. The iFS® laser creates what has also been called “The 10-Second Flap” through unprecedented speed and accuracy, and is designed to deliver biomechanically engineered flaps customized for each individual cornea. Because of its extraordinary speed and precision, the iFS® Femtosecond laser offers less discomfort for the patient, reduced tissue response and less inflammation for a more comfortable post-operative recovery.

The iFS® Femtosecond laser is designed uniquely with an inverted bevel-in side cut angle to effortlessly lift the corneal flap. The iFS® laser also enhances the adhesion of the post-operative flap and the stability of the cornea after LASIK. Additionally, it provides advanced options like the elliptical flap, by customizing the LASIK flap dimensions according to individual refractive errors and the corneal anatomy.

The new iFS® Advanced Femtosecond Laser system takes LASIK surgery — and more specifically, LASIK flap creation — to a whole new standard of speed and control. It’s designed to deliver superbly engineered flaps that can be customized for every individual cornea.

San Antonio Eye Specialists is proud to offer iFS femtosecond technology to our patients!


Our commitment to safety and advanced technology is evidenced by the technology Dr. Iskander chooses to perform the first portion of his Z-LASIK Allegretto Wave LASIK procedure. We strongly believe the Ziemer Femtosecond LDV laser is one of the world’s most advanced laser system for creating the thin protective layer in the outer portion of the cornea.

Presently, the Ziemer LDV system is one of the fastest femtosecond lasers on the market. Faster treatment times for patients means more comfort, increased safety and less trauma to the eye. Compared to more conventional femtosecond lasers, the Ziemer LDV operates at a higher pulse rate with lower light pulse energies and a specially designed optical system that provides maximum tissue disruption in the focal spot and no thermal or radiation effects to the surrounding tissue. In layman’s terms, it’s simply the most advanced and precise method available today for creating a corneal flap.

The Ziemer laser produces approximately 400 million tiny, closely-spaced gas bubbles at a predetermined depth in the corneal layer. These microscopic bubbles create a separation, which in turn creates the corneal flap. This level of precision allows Dr. Iskander to create LASIK flaps of precise thickness, orientation and size. Due to the tiny size of the gas bubbles, they disappear as soon as the flap is lifted by Dr. Iskander.

The Ziemer Femto LDV laser is also designed for maximum safety when compared to more conventional femtosecond lasers. Because we use a lower light pulse and lower pulse energy to create our flaps, there is a lower level of light intensity to the eye and less chance for an inflammatory response in the eye. As a result of Ziemer’s unique designs, patients enjoy faster recovery times, less discomfort and optimal visual outcomes.

Z-LASIK: The future of bladeless laser surgery

Z-LASIK is the most advanced innovation in bladeless surgery.

This procedure uses a high-frequency laser. It is designed to create truly customized flaps, precisely, safely and pain-free. Its beam is 100 times less intense than that of the first-generation femtosecond lasers.

Never before have safety, accuracy and patient comfort in laser eye surgery been so good, as proven by 100,000 successful Z-LASIK treatments.


    Z-LASIK offers many advantages that lead to better results:

  • Z-LASIK is gentle on the eyes: The procedure takes only a few seconds per eye, and usually 12 seconds for the creation of the corneal flap. The time the laser is in contact with the eye is reduced to a minimum.
  • Z-LASIK is comfortable and painless: head is not fixed during the procedure.
  • Z-LASIK helps in severe cases: Thanks to the extremely high frequency of the laser pulses, the layers of the cornea are separated with unprecedented precision, creating an ultra-thin flap. Z-LASIK is therefore effective in patients who were previously not candidates for laser surgery, including those patients with extreme myopia or thin corneas.
  • No inflammation: The laser energy used for Z-LASIK is 100 times less powerful than with other laser procedures. This is more gentle to the corneal tissue and prevents temporary inflammatory reactions of the eye.
  • Fast result: The recovery period is shorter than for other techniques. Visual improvement is noticeable within a few hours.
  • Fewer side effects: Z-LASIK enables the surgeon to enlarge the treatment zone. This reduces the risk of undesirable side effects such as dry eyes, deteriorated night vision or haloes (rings of light that surround point sources of light).


Expectations After LASIK

Your procedure will take less than 10 minutes for both eyes and will be minimally uncomfortable. As soon as you sit up right after surgery, you will be able to see distances that you could not see before. However, your vision may be “foggy” for the rest of the day. You may experience discomfort in your eyes for about 4-6 hours.

Closing your eyes, combined with regularly applying lubricating drops to the eyes is the best remedy for discomfort.

When you wake up in the morning, your eyes will feel normal with no or little discomfort and your vision will be clearer.

It will continue to improve over time. It is common for patients to see halos and star bursts around lights when they are driving at night. This generally disappears in a few weeks.

Expectations After PRK

Your procedure will take about 5 minutes for both eyes and will be minimally uncomfortable. You will see very well as soon as you sit up after surgery. After half an hour, when the anesthesia wears off, you might experience some discomfort. Your vision will remain good. Use of pain medications, eye drops and ice packs may be used if pain is severe.

The discomfort will progressively improve dramatically over the next 2 days. The vision will sharpen and stabilize over the next few weeks. The recovery is partially dependent on healing and age. For example, younger patients generally recover faster than older patients.

Improved Night Vision After PRK

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 a larger optical zone, virtually eliminating glare and night vision problems associated with older generation lasers.