Frequently Asked Questions About Custom LASIK

Frequently Asked Questions About Custom LASIK

Q What is custom LASIK? How is it different from LASIK?
A Imperfections of the eye consist of those that can be corrected by eyeglasses, such as nearsightedness, farsightedness, and astigmatism (lower order aberrations), and those involving fine distortions that cannot be corrected by glasses (higher order aberrations). While LASIK procedures treat imperfections that can be corrected by glasses, custom LASIK procedures also correct distortions in addition to what LASIK procedures are able to treat. Custom LASIK is an order-made LASIK that provides laser ablation tailored to the shapes and degrees of distortions unique to each eye. Any surgical procedure increases the distortions slightly. Custom LASIK procedures, however, could reduce such increases and provide a higher quality of vision.

Back to FAQ Top

Q For those who wish to receive a custom LASIK procedure, are there any special examinations required prior to the procedure?
A First, at the initial eye examination (suitability exam), corneal and ocular distortions are measured using an aberrometer. The doctor will make a precise determination as to the suitability for custom LASIK based on these measurements and other test results. Subsequently, if a patient chooses to undergo custom LASIK, his or her corneal and overall ocular distortions will be measured multiple times using an aberrometer at the preoperative final examination to determine the power of correction.

Back to FAQ Top

Q What are the differences between topography-guided LASIK and wavefront-guided LASIK?
A There are two types of custom LASIK: topography-guided LASIK and wavefront-guided LASIK. They differ by whether the distortions are determined based on the cornea or the entire eye. In topography-guided LASIK procedures, the laser ablation is tailored to the corneal distortions determined from corneal topography. If the distortions are mostly attributable to the cornea, topography-guided LASIK will be performed. In wavefront-guided LASIK procedures, on the other hand, the laser ablation are tailored to the overall distortions of the eye determined using an aberrometer.

Back to FAQ Top

Q What are the differences in procedure between custom LASIK and LASIK?
A In custom LASIK, a flap is created by a microkeratome before laser ablation just as in LASIK procedures. The required removal period for contact lenses before the procedure and the precautions on daily routines after the procedure, among other things, are the same between the two types of procedures. In custom LASIK procedures, however, more laser is used and more cornea is removed, with the amount of the additional corneal removal dependent on the degrees of corneal or optic distortions.

Back to FAQ Top

Q Can anyone undergo custom LASIK procedures?
A Most patients suitable to undergo LASIK are compatible with custom LASIK as well. Nevertheless, custom LASIK procedures could be challenging when a patient has severe nearsightedness, astigmatism, or a thin cornea. Custom LASIK procedures are particularly suitable for the following candidates:
those who have a great asymmetry in corneal shape;
those who have a significant corneal distortion;
those who have a significant distortion of the eye; and
those who have a large pupil diameter after dark adaptation.
     To determine whether a patient is suitable for topography-guided LASIK or wavefront-guided LASIK, distortions of the cornea and eye are measured using an aberrometer at the initial eye exam and again for multiple times at the preoperative final exam. The shapes and degrees of distortions along with the shape of the cornea following the procedure are determined and verified by simulation software. At Minamiaoyama Eye Clinic, approximately 50% of the patients who received LASIK have elected to undergo the custom LASIK procedure.

Back to FAQ Top

Q For those who have received LASIK surgery previously, is it possible to undergo custom LASIK for their enhancement surgery?
A Distortions increase slightly after a first LASIK procedure. It is possible to reduce the distortions by custom LASIK during an enhancement surgery.

Back to FAQ Top

Q What is the difference in vision compared to LASIK?
A Comparisons of vision in darkness (blur and glare) between LASIK and custom LASIK have shown that both wavefront-guided LASIK and topography-guided LASIK are better than LASIK. Based on these results, Minamiaoyama Eye Clinic recommends custom LASIK procedures.

Back to FAQ Top