Laser

What is LASIK?

LASIK (Laser-Assisted In Situ Keratomileusis) is an advanced refractive surgery procedure used to treat nearsightedness, farsightedness, and astigmatism.  During LASIK, the surgeon uses a microkeratome to create a small flap from the outer layers of the cornea.  The flap is then folded back.  The Excimer laser uses a cool beam of light that gently reshapes the surface of the cornea.  The cool beam of light pulses to remove a microscopic amount of tissue and allows images to be more sharply focused on the retina.

Wavefront-Guided Custom LASIK

Wavefront-guided LASIK uses a special device called a WaveScan to precisely measure the eye's unique irregularities and variations that could not have been measured before.  WaveScan technology produces a detailed map of the eye; and like a fingerprint, no two are alike.  This information is then translated into a set of CustomVue treatment instructions for the laser.  The WaveScan transfers these digital treatment instructions to the laser, providing a new level of precision and accuracy.

Wavefront-guided LASIK reduces the possibility of glare, halos, blurry images after surgery, and poor night vision that higher-order aberrations may cause.  Higher-order aberrations are distortions in your vision and can only be measured with wavefront analysis.  These distortions cannot be corrected with glasses or contacts.

What is Advanced Surface Ablation?

Advanced Surface Ablation is removing the epithelium (or top layer of cells) from the cornea and using a LASER to reshape the cornea to correct your vision (also called your refractive error). The epithelium can be removed several ways.

Dr. Wang prefers to use a mild solution of alcohol on the eye in a special way preoperatively. The alcohol solution loosens the epithelium so that it can be gently removed, in preparation for the LASER treatment. A contact lens will be place on the eye after the surgery to allow the epithelium to regenerate and to provide greater patient comfort during the healing phase. This technique has a slower return of vision than LASIK, but also has other medical advantages. 

There are three advantages to this technique over LASIK. The first is that it is a safer procedure. Cutting a flap can weaken the cornea; and since tissue is removed, the cornea is further thinned. Advanced Surface Ablation is safer than LASIK. The second advantage is that the complication rate is lower. LASIK has complications from slipped flaps, superficial clouding of the cornea under the flap   (diffuse lamellar keratitis) and abnormal regeneration of the epithelium into the eye (epithelial ingrowth) . The third advantage is that when the WaveScan (like a finger-print of the eye) is performed before surgery, the laser treats the eye based on those measurements. When a LASIK flap is cut, higher order visual distortion, not in the visual axis or center of your vision, (aberrations) can occur. Since they occur after the WaveScan test was performed, these abnormalities are not figured into the treatment plan. Therefore, Advanced Surface Ablation is safer and more accurate.

References:
Carones F, Vigo L, Carones AV et al. Evaluation of photorefractive keratectomy retreatments after regressed myopic laser in situ keratomileusis. Ophthalmology 2001; 108 (10): 1732-1737. [pubmed]
El-Agha MS, Johnston EW, Bowman RW et al. Excimer laser treatment of spherical hyperopia: PRK or LASIK? Trans Am Ophthalmol Soc 2000; 98: 59-66. [pubmed]
Hersh PS., Brint SF, Maloney RK, et al. Photorefractive keratectomy versus laser in situ keratomileusis for moderate to high myopia. A randomized prospective study. Ophthalmology 1998; 105 (8): 1512-1522. [pubmed]
 Hampton, Roy, M.D., LASIK and Advanced Surface Ablation, Little Rock Arkansas, 2005: Chapter 3

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Our Value: To emulate Christ's example of compassion, humility, and integrity in all relationships.

Our Mission: To preserve and restore eyesight, both in our community and around the world.

Our Operating Philosophy: To provide the highest quality of care to every patient, using the best available technology, research and continuing education for our doctors and staff, both now and in the future.

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