Try the modernized beta website. Learn more about the modernization effort.
Working… Menu

Correction of Myopia Evaluation Trial (COMET)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00000113
Recruitment Status : Completed
First Posted : September 24, 1999
Last Update Posted : April 15, 2016
National Eye Institute (NEI)
Information provided by:
Stony Brook University

Brief Summary:

To evaluate whether progressive addition lenses (PALs) slow the rate of progression of juvenile-onset myopia (nearsightedness) when compared with single vision lenses, as measured by cycloplegic autorefraction. An additional outcome measure is axial length, as measured by A-scan ultrasonography.

To describe the natural history of juvenile-onset myopia in a group of children receiving conventional treatment (single vision lenses).

Condition or disease Intervention/treatment Phase
Myopia Other: Progressive Addition Lenses Other: single vision lenses Phase 3

Detailed Description:

Myopia (nearsightedness) is an important public health problem, which entails substantial societal and personal costs. It is highly prevalent in our society and even more frequent in Asian countries; furthermore, its prevalence may be increasing over time. High myopia contributes to significant loss of vision and blindness. At present, the mechanisms involved in the etiology of myopia are unclear, and there is no way to prevent the condition. Current methods of correction require lifelong use of lenses or surgical treatment, which is expensive and may lead to complications. The rationale for this trial, the Correction of Myopia Evaluation Trial (COMET), arises from the convergence of research involving (1) the link between accommodation and myopia in children and (2) animal models of myopia showing the important role of the visual environment in eye growth. A contribution of this research is that blur is a critical component in the development of myopia. The primary aim of COMET, to evaluate the efficacy of progressive addition lenses, a noninvasive intervention, in slowing the progression of myopia, follows from this line of reasoning. These lenses should provide clear visual input over a range of viewing distances without focusing effort by the child. The comparison of myopia progression in children treated with PALs versus single vision lenses will allow the quantification of the effect of PALs on myopia progression during the followup period.

The COMET is a multicenter, randomized, double-masked clinical trial to evaluate whether PALs slow the progression of juvenile-onset myopia as compared with single vision lenses. The study is a collaborative effort that involves a Study Chair at the New England College of Optometry; four clinical centers at colleges of optometry in Boston, Birmingham, Philadelphia, and Houston; and a Coordinating Center at the State University of New York at Stony Brook.

The sample size goal, 450 children with myopia in both eyes who met specific inclusion and exclusion criteria, was attained with the enrollment of 469 children in one year. Children were identified from school screenings, clinic records, and referrals from local practitioners. Eligible children were randomly assigned to receive progressive addition or single vision lenses. Participating children are being examined at 6-month intervals following baseline, for at least 3 years, to measure changes in refractive error and to update prescriptions, according to a specified protocol. A dilated examination to evaluate the study outcome measures is performed at the annual study visits. A standardized, common protocol is used at all centers.

The primary outcome of the study is progression of myopia, defined as the magnitude of the change relative to baseline in spherical equivalent refraction, determined by cycloplegic autorefraction. The secondary outcome of the study is axial length measured by A-scan ultrasonography.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 469 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Correction of Myopia Evaluation Trial (COMET)
Study Start Date : September 1997
Actual Primary Completion Date : October 2001
Actual Study Completion Date : September 2013

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Progressive Addition Lenses (PALs) Other: Progressive Addition Lenses
Varilux comfort with +2.00 addition

Active Comparator: Single Vision Lenses Other: single vision lenses

Primary Outcome Measures :
  1. Progression of myopia, determined by cycloplegic autorefraction

Secondary Outcome Measures :
  1. Axial length measured by A-scan ultrasonography

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   6 Years to 12 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Children between the ages of 6 and 12 years with myopia in both eyes (defined as spherical equivalent between -1.25 D and -4.50 D in each eye as measured by cycloplegic autorefraction), astigmatism less than or equal to 1.50 D, and no anisometropia (defined as a difference in spherical equivalent between the two eyes greater than 1.0 D) are eligible for inclusion. Exclusion criteria include visual acuity greater than 20/25, strabismus, use of contact lenses, birth weight less than 1,250 grams, use of bifocal or progressive addition lenses, or any conditions precluding adherence to the protocol.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00000113

Layout table for location information
United States, Alabama
University of Alabama-Birmingham, School of Optometry
Birmingham, Alabama, United States, 35294-0010
United States, Massachusetts
New England College of Optometry
Boston, Massachusetts, United States, 02115
United States, Pennsylvania
Pennsylvania College of Optometry
Philadelphia, Pennsylvania, United States, 19141-3399
United States, Texas
University of Houston, College of Optometry
Houston, Texas, United States, 77204-6052
Sponsors and Collaborators
Stony Brook University
National Eye Institute (NEI)
Layout table for investigator information
Study Chair: Jane Gwiazda, PhD New England College of Optometry
Study Director: Leslie Hyman, PhD Stony Brook Medicine
Additional Information:
Publications of Results:
Publications automatically indexed to this study by Identifier (NCT Number):
Layout table for additonal information Identifier: NCT00000113    
Other Study ID Numbers: NEI-9
U10EY011756 ( U.S. NIH Grant/Contract )
First Posted: September 24, 1999    Key Record Dates
Last Update Posted: April 15, 2016
Last Verified: April 2016
Keywords provided by Stony Brook University:
Additional relevant MeSH terms:
Layout table for MeSH terms
Refractive Errors
Eye Diseases