Efficacy and Tolerance of Full Field Peripheral Defocus Spectacles for the Control of Myopia Progression (Myofix Study)

July 25, 2025 updated by: Novar Corporation

One-year Efficacy and Tolerance of Myofix Spectacles for the Control of Myopia Progression

The purpose of this study is to evaluate the efficacy and tolerability of the use of a new model of spectacles designed to control the progression of myopia in childhood. School myopia in children is mainly produced by increased ocular growth. This new spectacle design is based in the fact that positive lenses in front of eyes produce changes that decrease ocular growth. It consists of a full field peripheral positive defocus lens and a central section for the distance correction. The study is designed to evaluate tolerance and efficacy of this new lens in myopic children along a two year period.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

The Myofix Defocus Study is a longitudinal, prospective, interventional, non-randomized research study intended to evaluate the tolerability and effectiveness of the use of spectacles with special design to control the progression of myopia during childhood. This field study included children aged 8 to 15 years old who voluntarily agreed to use the Defocus Spectacles for one year. A pair of spectacles (Myofix, Novar, Argentina) with frames (Usual, Argentina) were provided free of charge to all children studied for one year with the special addendum of peripheral defocus treatment. Children are instructed to wear the glasses the whole day every day of the week including Saturdays and Sundays.The Argentinian Defocus Spectacle lens design preserves the principle of the original design presented by Carly Lam et al., which consisted of a 9 mm central zone for distance correction and a +3.50 diopters defocus correction ring of lenslets laying between 9 and 32 mm diameter to act primarily on the para foveal zone that detects the defocus that governs the growth of the eye. Instead of micro peripheral defocus lenses in the 32 mm diameter ring zone with treatment, our model has a uniform peripheral +/+3.50 diopters power zone add. As it is known that 30-40 minutes of exposure to myopic defocus modifies the axial length (measured with Lenstar) by approximately 10-15 microns due to changes in choroidal thickness, the national design has been tested on 17 volunteer subjects showing a significant change of 11 microns shortening in the axial length of their eyes, such that that pilot study suggested the lenses could be effective in arresting the progression of myopia, as changes in the choroid are the first events in the retinal message that manages ocular growth. For comparing the outcomes of this study two virtual control groups in American children will be considered. One control group will be taken from a study in US giving children diluted atropine drops for myopia control. The placebo treated arm of this group will be considered. The other control group will be a cohort of children followed up in Argentina with cycloplegic refractions one year before the pandemic closeup began.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
47

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Argentina
      • Buenos Aires, Argentina, 1061
        • Drs. Iribarren Eye Consultants

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Children aged 7 to 16 years who voluntarily agreed to use the Defocus spectacles for one year.
  • A consecutive series of children diagnosed with myopia, attending accredited private practice ophthalmology clinics across Argentina.
  • Absence of ocular pathology other than myopia,
  • Spherical equivalent (SE = sphere + [cylinder/2]) between ≤-0.50 D and -5.00 D
  • Astigmatism less than -2.00 D
  • Anisometropia less than -1.00 D
  • Keratometry less than 47.00 D in the steepest meridian
  • The corrected distance visual acuity based on subjective refraction was required to be 0.1 logMAR (20/25 Feet Snellen) or better in each eye.

Exclusion Criteria:

  • Myopia with onset before the age of 6 years,
  • Any genetic syndromes,
  • Current medical treatment for myopia other than single vision spectacle correction.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: MYOPIA TREATED
MYOPIC CHILDREN TREATED WITH MYOFIX SPECTACLES
Device: MYOFIX FULL FIELD PERIPHERAL DEFOCUS SPECTACLE
This is a plus peripheral add spectacle with the central part for the myopic correction.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
RATE OF MYOPIA PROGRESSION IN DIOPTERS
Time Frame: 12 MONTHS AND 24 MONTHS FOLLOW UP PLANNED
THE AMOUNT OF DIOPTERS OF MYOPIC PROGRESSION IN ONE YEAR FOLLOW UP MEASURED WITH CYCLOPLEGIC REFRACTIONS
12 MONTHS AND 24 MONTHS FOLLOW UP PLANNED

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Novar Corporation

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

  • De Tomas M, Kotlik C, Szeps A, Impagliazzo R, Iribarren R. New Spectacles for Myopia Control. Oftalmol Clin Exp. 2022; 15: 240-7.
  • Iribarren R SA, Kotlik C, Laurencio L, De Tomas M, Impagliazzo R, Martin G. Short-Term Axial Length Changes in Myopic Eyes Induced by Defocus Spectacles for Myopia Control. Photonics 2023; 10: 668.
  • De Tomás M SA, Martín G, Saracco G, Lanca C, Iribarren R. Effect of vertex distance in the treatment area of myopia control spectacles. Oftalmol Clin Exp 2024; 17: e547-e53.
  • Saracco G AM, De Tomás M, Martín G, Iribarren R. Development of a frame adaptation for myopia control spectacles. Oftalmol Clin Exp 2025; 18: e195-e201.
  • Szeps A KC, Fernández Irigaray L, Saracco G, De Tomas M, Martin G, Iribarren R. Baseline data in the study on the tolerance and efficacy of peripheral defocus spectacles for the control of myopia progression in Argentina (Myofix Defocus Study). Oftalmol Clin Exp 2024; 17: 352-8.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
May 23, 2023

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
April 23, 2024

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
April 23, 2024

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 18, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 25, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
July 29, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
July 29, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 25, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
July 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • Registration No. 8638/23
  • Registration No. 8638 (Other Identifier: Ethics Committee of the Argentine Society of Ophthalmology)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

There are plans to share individual participant data if any investigator in the area of myopia control research asks us about the data.

IPD Sharing Time Frame

The IPD and supporting information will be available after the study is finished and published with no time limit.

IPD Sharing Access Criteria

Any researcher in myopia control area may ask for the data. The data will be provided in an SSPS dataset, send at their formal request.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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