Purpose

To compare the efficacy of 1 hour/day of binocular game play 5 days per week plus spectacle correction with spectacle correction only, for treatment of amblyopia in children 4 to <13 years of age.

Condition

Eligibility

Eligible Ages
Between 4 Years and 12 Years
Eligible Genders
All
Accepts Healthy Volunteers
No

Inclusion Criteria

  1. Age 4 to <13 years
  2. Amblyopia associated with strabismus, anisometropia, or both (previously treated or untreated)
  3. Criteria for strabismic amblyopia: At least one of the following must be met:
  4. Presence of a heterotropia on examination at distance or near fixation (with or without optical correction, must be no more than 5pd by SPCT at near fixation (see #6 below)
  5. Documented history of strabismus which is no longer present (which in the judgment of the investigator could have caused amblyopia)
  6. Criteria for anisometropia: At least one of the following criteria must be met:
  7. ≥1.00 D difference between eyes in spherical equivalent
  8. ≥1.50 D difference in astigmatism between corresponding meridians in the two eyes
  9. Criteria for combined-mechanism amblyopia: Both of the following criteria must be met:
  10. Criteria for strabismus are met (see above)
  11. ≥1.00 D difference between eyes in spherical equivalent OR ≥1.50 D difference in astigmatism between corresponding meridians in the two eyes
  12. No amblyopia treatment other than optical correction in the past 2 weeks (patching, atropine, Bangerter, vision therapy, binocular treatment)
  13. Requirements for required refractive error correction (based on a cycloplegic refraction completed within the last 7 months):
  14. Hypermetropia of 2.50 D or more by spherical equivalent (SE)
  15. Myopia of amblyopic eye of 0.50D or more SE
  16. Astigmatism of 1.00D or more
  17. Anisometropia of more than 0.50D SE

NOTE: Subjects with cycloplegic refractive errors that do not fall within the requirements above for spectacle correction may be given spectacles at investigator discretion but must follow the study-specified prescribing guidelines, as detailed below.

1. Spectacle prescribing instructions referenced to the cycloplegic refraction completed within the last 7 months:

- SE must be within 0.50D of fully correcting the anisometropia.

- SE must not be under corrected by more than 1.50D SE, and reduction in plus sphere must be symmetric in the two eyes.

- Cylinder power in both eyes must be within 0.50D of fully correcting the astigmatism.

- Axis must be within +/- 10 degrees if cylinder power is ≤1.00D, and within +/- 5 degrees if cylinder power is >1.00D.

- Myopia must not be undercorrected by more than 0.25D or over corrected by more than 0.50D SE, and any change must be symmetrical in the two eyes.

2. Spectacle correction meeting the above criteria must be worn:

- For at least 16 weeks OR until VA stability is documented (defined as <0.1 logMAR change by the same testing method measured on 2 consecutive exams at least 8 weeks apart).

- For determining VA stability (non-improvement):

- The first of two measurements may be made 1) in current spectacles, or 2) in trial frames with or without cycloplegia or 3) without correction (if new correction is prescribed),

- The second measurement must be made without cycloplegia in the correct spectacles that have been worn for at least 8 weeks.

- Note: since this determination is a pre-study procedure, the method of measuring VA is not mandated.

5. VA, measured in each eye without cycloplegia in current spectacle correction (if applicable) within 7 days prior to randomization using the ATS-HOTV VA protocol for children < 7 years and the E-ETDRS VA protocol for children ≥ 7 years on a study-approved device displaying single surrounded optotypes, as follows:

1. VA in the amblyopic eye 20/40 to 20/200 inclusive (ATS-HOTV) or 33 to 72 letters (E-ETDRS)

2. VA in the fellow eye 20/25 or better (ATS-HOTV) or ≥ 78 letters (E-ETDRS)

3. Interocular difference ≥ 3 logMAR lines (ATS-HOTV) or ≥ 15 letters (E-ETDRS)

6. Heterotropia with a near deviation of ≤ 5∆ (measured by SPCT) in habitual correction (Angles of ocular deviation >5∆ are not allowed because large magnitudes of the deviation would compromise successful playing of the game.)

7. Subject is able to play the Dig Rush game (at least level 3) on the study iPad under binocular conditions (with red-green glasses). Subject must be able to see both the red "diggers" and blue "gold carts" when contrast for the non-amblyopic eye is at 20%.

8. Investigator is willing to prescribe computer game play, or continued spectacle wear per protocol.

9. Parent understands the protocol and is willing to accept randomization.

10. Parent has phone (or access to phone) and is willing to be contacted by Jaeb Center staff or other study staff.

11. Relocation outside of area of an active PEDIG site for this study within the next 8 weeks is not anticipated.

Exclusion Criteria

  1. Prism in the spectacle correction at time of enrollment (eligible only if prism is discontinued 2 weeks prior to enrollment).
  2. Myopia greater than -6.00D spherical equivalent in either eye.
  3. Previous intraocular or refractive surgery.
  4. Any treatment for amblyopia (patching, atropine, Bangerter filter, vision therapy or previous binocular treatment) during the past 2 weeks. Previous amblyopia therapy is allowed regardless of type, but must be discontinued at least 2 weeks prior to enrollment.
  5. Ocular co-morbidity that may reduce VA determined by an ocular examination performed within the past 7 months (Note: nystagmus per se does not exclude the subject if the above VA criteria are met).
  6. No Down syndrome or cerebral palsy
  7. No severe developmental delay that would interfere with treatment or evaluation (in the opinion of the investigator). Subjects with mild speech delay or reading and/or learning disabilities are not excluded.
  8. Subject has demonstrated previous low compliance with binocular treatment and/or spectacle treatment (as assessed informally by the investigator)

Study Design

Phase
N/A
Study Type
Interventional
Allocation
Randomized
Intervention Model
Parallel Assignment
Primary Purpose
Treatment
Masking
Single (Outcomes Assessor)

Arm Groups

ArmDescriptionAssigned Intervention
Experimental
Binocular Computer Game Treatment
Binocular computer game treatment is defined as playing a Dig Rush application on an iPad® 1 hour per day, 5 days per week for 8 weeks in addition to continued spectacle correction (if required)
  • Other: iPad®
    Binocular therapy using a Dig Rush application on an iPad®
Active Comparator
Continued Spectacle Correction
Continued spectacle correction is defined as wearing appropriate spectacle correction (if required) for all waking hours, 7 days per week for 8 weeks.
  • Other: Spectacle correction
    Spectacle correction for all waking hours, 7 days per week

Recruiting Locations

UAB Pediatric Eye Care; Birmingham Health Care
Birmingham, Alabama 35294

More Details

NCT ID
NCT02983552
Status
Recruiting
Sponsor
Jaeb Center for Health Research

Study Contact

Raymond Kraker, MSPH
813-975-8690
rkraker@jaeb.org

Detailed Description

The purpose of the study is to compare the efficacy of 1 hour/day of binocular game play 5 days per week plus spectacle correction with spectacle correction only, for treatment of amblyopia in children 4 to <13 years of age.

Notice

Study information shown on this site is derived from ClinicalTrials.gov (a public registry operated by the National Institutes of Health). The listing of studies provided is not certain to be all studies for which you might be eligible. Furthermore, study eligibility requirements can be difficult to understand and may change over time, so it is wise to speak with your medical care provider and individual research study teams when making decisions related to participation.