Wavefront-guided PRK vs Wavefront-optimized PRK

Not Recruiting

Trial ID: NCT02091934


The purpose of the study is to compare the results of PRKK surgery when using wavefront-guided excimer laser treatment compared to wavefront optimized excimer laser treatment in patients with nearsightedness with and without astigmatism

Official Title

A Prospective, Randomized Comparison of Fellow Eyes Undergoing Wavefront-guided PRK Versus Wavefront-optimized PRK Using the Alcon Allegretto Eye-Q 400 Excimer Laser

Stanford Investigator(s)

Edward Manche, MD
Edward Manche, MD

Professor of Ophthalmology


Inclusion Criteria:

* Subjects age 21 and older with healthy eyes.
* Nearsightedness between -0.25 diopters and -8.00 diopters with or without astigmatism of up to 5.00 diopters.

Exclusion Criteria:

* Subjects under the age of 21.
* Excessively thin corneas.
* Topographic evidence of keratoconus.
* Ectactic eye disorders.
* Autoimmune diseases.
* Pregnant or nursing.
* Patients must have similar levels of nearsightedness in each eye. They can not be more than 2.5 diopter of difference between eyes.
* Patients must have similar levels of astigmatism in each eye. They can not have more than 1.5 diopter of difference between eyes.


procedure: Wavefront-guided PRK

procedure: Wavefront-optimized PRK

Not Recruiting

Contact Information

Stanford University
School of Medicine
300 Pasteur Drive
Stanford, CA 94305
Linda Schwartz
650 498-7020