COVID-19 is an emerging, rapidly evolving situation.
Get the latest public health information from CDC:

Get the latest research information from NIH: Menu

Patching for Lazy Eye: Trial to Evaluate Daily Patching Amounts

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: NCT00274664
Recruitment Status : Completed
First Posted : January 11, 2006
Last Update Posted : January 11, 2006
Imperial College London
Information provided by:
City, University of London

Brief Summary:

Amblyopia ('lazy eye') is the commonest visual disorder of childhood and is caused by an interruption to visual development. Occlusion of the better eye by patching is the mainstay of treatment, so forcing use, of the affected eye. We have little understanding of how much treatment is required for improvement, so occlusion may continue for many months. This is both demanding for the child and family as a whole. Treatment outcome is frequently unsatisfactory. Compliance is often poor, thus we do not know precisely how much treatment the child actually receives or how much is required.

To overcome this, we have designed an instrument that permits us to measure occlusion: an occlusion dose monitor (ODM) which provides an objective record of how much occlusion a child actually receives. Recently we have observed that 75% of improvement induced by occlusion occurs in the first four weeks of treatment. In this study we explore the possibility that by intensive treatment the period of amblyopia therapy can be shortened - i.e. treatment will be more efficient, more effective, and more 'family-friendly'. The study hypothesis is that 12 hours/day of patching is more effective than 6 hours/day.

Condition or disease Intervention/treatment Phase
Amblyopia Device: 6 hours occlusion by patching Device: 12 hours occlusion by patching Phase 1

Detailed Description:

The identification and subsequent management of amblyopia are major consumers of health service resource, and within the hospital sector account for around 80-90% of visits to the children's eye service. Occlusion of the better eye is the mainstay of treatment and because we have little understanding of the dose-response relationship this may continue for many months and sometimes for many hundreds of hours. This is demanding for the child and family as a whole and yet the outcome is frequently unsatisfactory. Currently, there is no reliable data on the kinetics of visual improvement, so occlusion tends to be prescribed on an ad hoc basis. Recent pilot research has shown that 75% of the treatment-generated improvement occurs within the first 4 weeks when 6 hours/day occlusion is prescribed.

In this study we explore the possibility that by intensive treatment the period of amblyopia therapy can be shortened - i.e. made both more efficient and hopefully more effective. The purpose of the present study, the Randomized Occlusion Treatment of Amblyopia Study (ROTAS), is to compare two frequently employed patching regimens: 'substantial' (6 hrs/day) against 'maximal' (12 hrs/day) patching. Our experimental design incorporates objective occlusion monitoring and is able to discriminate the beneficial effect of refractive correction from that of occlusion. The study comprises three phases: 'baseline', 'refractive adaptation' and 'occlusion.' Our aim is to provide guidelines for patient management based, for the first time, on experimentally determined and statistically verifiable relationships between treatment and outcome.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Enrollment : 100 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Randomised Occlusion Treatment of Amblyopia Study (ROTAS): Trial of Maximal Vs Substantial Doses of Occlusion to Evaluate Visual Outcome for Children With Amblyopia
Study Start Date : February 2002
Study Completion Date : May 2005

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Amblyopia

Primary Outcome Measures :
  1. The primary outcome measure was logMAR visual acuity, measured 6-weekly for 18 weeks in refractive adaptation phase. In occlusion phase measured 2-weekly until no further gains

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:   3 Years to 8 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • 3 to 8 years of age;
  • Presence of anisometropia and/or strabismus;
  • inter-ocular acuity difference of at least 0.1 logMAR
  • parental consent

Exclusion Criteria:

  • history of previous occlusion therapy
  • ocular pathology
  • learning difficulties

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): NCT00274664

Layout table for location information
United Kingdom
St Marys Hospitals
London, Greater London, United Kingdom, W2 1NY
Hillingdon Hospital
London, Middlesex, United Kingdom, UB8 3NN
Sponsors and Collaborators
City, University of London
Imperial College London
Layout table for investigator information
Principal Investigator: Merrick J Moseley, PhD City, University of London
Publications automatically indexed to this study by Identifier (NCT Number):
Layout table for additonal information Identifier: NCT00274664    
Other Study ID Numbers: ROTAS-091206
Fight for Sight: 20500
First Posted: January 11, 2006    Key Record Dates
Last Update Posted: January 11, 2006
Last Verified: December 2005
Keywords provided by City, University of London:
Occlusion dose monitoring
Refractive adaptation
Additional relevant MeSH terms:
Layout table for MeSH terms
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Vision Disorders
Sensation Disorders
Neurologic Manifestations
Eye Diseases