Wavefront-guided PRK vs Wavefront-optimized PRK

Not Applicable

Completed

• Conditions: Astigmatism; Myopia
• Interventions: Procedure: Wavefront-optimized PRK; Procedure: Wavefront-guided PRK

• Registration Number: NCT02091934
• Lead Sponsor: Stanford University

Brief Summary

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

Detailed Description

This is a research study comparing the outcomes of PRK surgery for nearsightedness when using the two different excimer laser technologies. Patients will have both eyes treated with the Alcon WaveLight Allegretto excimer laser. You will be one of 50 sighted patients at Stanford to undergo treatment in this clinical research trial. This will be a prospective, randomized, research study in which up to 100 consecutive eyes scheduled to undergo excimer laser photo refractive keratectomy (PRK) using one laser technology in the first eye and the second laser technology in the fellow eye for the correction of myopia (nearsightedness) with or without astigmatism will be enrolled. The choice of which eye receives the wavefront guided technology and which eye receives the wavefront-optimized technology will be randomized prior to enrollment. Randomization will be done according to a randomization schedule. You will not know which eye is being treated with which each technology. The randomization will determine only whether your right or left eye is treated with the wavefront guided technology. The other eye will be treated with wavefront-optimized laser technology. You have a fifty percent chance of having your left eye treated with custom wavefront guided technology as your right eye. Subjects will undergo bilateral (both eyes at once) PRK treatments using the Alcon WaveLight Allegretto excimer laser. All subjects will be followed for one year after the vision correction procedure. Subjects scheduled to undergo PRK for the correction of myopia (nearsightedness) with or without astigmatism will be screened for eligibility. Eligible subjects will be examined preoperatively to establish a baseline for ocular condition (the general health and glasses prescription of the eyes). Postoperatively, subjects will undergo an ophthalmic evaluation (complete eye examination) at regular intervals as specified in this protocol. Patients will complete questionnaires preoperatively and postoperatively evaluating quality of vision and quality of life. Retreatments (a second operation on the same eye for residual nearsightedness) will not be allowed during the first twelve months of this study. If you elect to undergo a retreatment of your PRK surgery prior to the 12-month post-operative visit, the retreated eye will be exited from the study as of the retreatment date.

Any significant new finding developed during the course of the research which may relate to the subject's willingness to continue participation will be provided to the subject or subject's representative in a timely manner.

Study Timeline

• Study Start: 2009-04-01
• Primary Completion: 2012-03-31
• Study Completion: 2012-03-31
• Study First Submitted: 2014-03-09
• Study First Submitted QC: 2014-03-18
• Study First Posted: 2014-03-19
• Status Verified: 2021-11
• Last Update Submitted: 2021-11-24
• Last Update Posted: 2021-12-08

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 71

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.

Read More

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.

Read More

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Wavefront-optimized PRK	Wavefront-optimized PRK	Wavefront-optimized PRK
Wavefront-guided PRK	Wavefront-guided PRK	Wavefront-guided PRK

Primary Outcome Measures

Name	Time	Method
Uncorrected visual acuity	One year	Uncorrected visual acuity

Secondary Outcome Measures

Name	Time	Method
Quality of vision and quality of life questionnaire	One year	Patient Reported Outcomes Questionnaire
Changes in best corrected 5 and 25% contrast visual acuity	One year	Changes in best corrected 5 and 25% contrast visual acuity
Changes in best corrected visual acuity	One year	Changes in best corrected visual acuity
Wavefront analysis	One year	Wavefront analysis
Refractive predictability	One year	Refractive predictability
Topographic analysis	One year	Topographic analysis
Corneal haze	One year	Corneal haze

Trial Locations

Locations (1)

Stanford Eye Laser Center; 🇺🇸 Palo Alto, California, United States