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Observational Study of Optical Correction for Strabismic Amblyopia in Children 3 to <7 Years Old (ATS13)

This study has been completed.
Sponsor:
Collaborator:
National Eye Institute (NEI)
Information provided by (Responsible Party):
Jaeb Center for Health Research
ClinicalTrials.gov Identifier:
NCT00669539
First received: April 28, 2008
Last updated: May 31, 2012
Last verified: May 2012
History of Changes
Results First Received: April 16, 2012  
Study Type: Observational
Study Design: Observational Model: Cohort;   Time Perspective: Prospective
Condition: Amblyopia

  Participant Flow
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Recruitment Details
Key information relevant to the recruitment process for the overall study, such as dates of the recruitment period and locations
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Pre-Assignment Details
Significant events and approaches for the overall study following participant enrollment, but prior to group assignment
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Reporting Groups
  Description
Combined-Mechanism Amblyopia Chilren with strabismus and anisometropia who were prescribed refractive error correction with spectacles. The eye with worse visual acuity was labeled the amblyopic eye; the eye with better visual acuity was labeled the fellow eye. All analyses included only 1 observation per participant.
Strabismus-Only Amblyopia Chilren with pure strabismus who were prescribed refractive error correction with spectacles. The eye with worse visual acuity was labeled the amblyopic eye; the eye with better visual acuity was labeled the fellow eye. All analyses included only 1 observation per participant.

Participant Flow:   Overall Study
    Combined-Mechanism Amblyopia     Strabismus-Only Amblyopia  
STARTED     94     52  
COMPLETED     86 [1]   43 [1]
NOT COMPLETED     8     9  
[1] Completed defined as completing 18 week primary outcome exam



  Baseline Characteristics
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Reporting Groups
  Description
Combined-Mechanism Amblyopia Chilren with strabismus and anisometropia who were prescribed refractive error correction with spectacles. The eye with worse visual acuity was labeled the amblyopic eye; the eye with better visual acuity was labeled the fellow eye. All analyses included only 1 observation per participant.
Strabismus-Only Amblyopia Chilren with pure strabismus who were prescribed refractive error correction with spectacles. The eye with worse visual acuity was labeled the amblyopic eye; the eye with better visual acuity was labeled the fellow eye. All analyses included only 1 observation per participant.
Total Total of all reporting groups

Baseline Measures
    Combined-Mechanism Amblyopia     Strabismus-Only Amblyopia     Total  
Number of Participants  
[units: participants]
 		  94     52     146  
Age [1]
[units: years]
Mean ± Standard Deviation 		  5.1  ± 1.1     4.7  ± 1.0     4.9  ± 1.1  
Age, Customized [1]
[units: participants]
 		     
3 to <4 years     14     16     30  
4 to <5 years     35     16     51  
5 to <6 years     19     15     34  
6 to <7 years     26     5     31  
Gender  
[units: participants]
 		     
Female     46     23     69  
Male     48     29     77  
Race/Ethnicity, Customized  
[units: participants]
 		     
Asian     3     0     3  
Black/Aftican American     4     7     11  
Hispanic     4     7     11  
White     82     37     119  
More than one race     0     1     1  
Unknown/not reported     1     0     1  
Distance Visual Acuity Amblyopic Eye [2]
[units: logMAR]
Mean ± Standard Deviation 		  0.64  ± 0.24     0.65  ± 0.26     0.64  ± 0.24  
Distance Visual Acuity in Fellow Eye [3]
[units: logMAR]
Mean ± Standard Deviation 		  0.09  ± 0.12     0.16  ± 0.11     0.12  ± 0.12  
Interocular Difference in Distance Visual Acuity [4]
[units: logMAR lines]
Mean ± Standard Deviation 		  5.4  ± 2.4     4.9  ± 2.2     5.2  ± 2.3  
Spherical Equivalent Refractive Error in Amblyopic Eye [5]
[units: participants]
 		     
0 to <+1.00 diopters (better)     1     1     2  
+1.00 to <+2.00 diopters     8     3     11  
+2.00 to <+3.00 diopters     5     17     22  
+3.00 to <+4.00 diopters     17     10     27  
>=+4.00 diopters (worse)     63     21     84  
Spherical Equivalent Refractive Error in Amblyopic Eye [6]
[units: diopters]
Mean ± Standard Deviation 		  4.65  ± 1.79     3.69  ± 1.74     4.31  ± 1.83  
Spherical Equivalent Refractive Error in Fellow Eye [7]
[units: participants]
 		     
0 to <+1.00 diopters (better)     11     1     12  
+1.00 to <+2.00 diopters     24     5     29  
+2.00 to <+3.00 diopters     32     17     49  
+3.00 to <+4.00 diopters     9     12     21  
>=+4.00 diopters (worse)     18     17     35  
Spherical Equivalent Refractive Error in Fellow Eye [7]
[units: diopters]
Mean ± Standard Deviation 		  2.61  ± 1.60     3.44  ± 1.62     2.90  ± 1.65  
Ocular Alignment [8]
[units: participants]
 		     
0 prism diopters (better)     23     14     37  
1-8 prism diopters     48     15     63  
>8 prism diopters (worse)     23     23     46  
Ocular Alignment [8]
[units: prism diopters]
Mean ± Standard Deviation 		  5.7  ± 7.0     11.1  ± 14.5     7.6  ± 10.6  
[1] Age at enrollment in years
[2] Visual acuity was measured in the amblyopic eye using the Amblyopia Treatment Study (ATS) visual acuity testing protocol resulting in a Snellen acuity score that can range from 20/16 (best) to 20/800 (worst). Scores were converted to log of minimum angle of resolution (logMAR) equivalents for analyses (lower logMAR value is better than higher logMAR).
[3] Visual acuity was measured in the fellow eye using the Amblyopia Treatment Study (ATS) visual acuity testing protocol resulting in a Snellen acuity score that can range from 20/16 (best) to 20/800 (worst). Scores were converted to log of minimum angle of resolution (logMAR) equivalents for analyses (lower logMAR value is better than higher logMAR).
[4] The difference between eyes in logMAR visual acuity was calculated. Larger positive values of the difference indicate better visual acuity in the fellow eye, larger negative values indicate better visual acuity in the amblyopic eye, and small values indicate similar visual acuities between the eyes.
[5] Spherical equivalent in diopters defined from cycloplegic refraction as sphere plus half the cylinder value in the amblyopic eye. Larger values indicate more refractive error; larger spherical equivalent values are worse than smaller values.
[6] Spherical equivalent in diopters defined from cycloplegic refraction as sphere plus half the cylinder value in the amblyoic eye. Larger values indicate more refractive error; larger spherical equivalent values are worse than smaller values.
[7] Spherical equivalent in diopters defined from cycloplegic refraction as sphere plus half the cylinder value in the fellow eye. Larger values indicate more refractive error; larger spherical equivalent values are worse than smaller values.
[8] Minimum ocular alignment in prism diopters at distance or near defined from the simultaneous prism and cover test. Lower values of ocular alignment are better than higher values.



  Outcome Measures

1.  Primary:   Mean Amblyopic Eye Visual Acuity Improvement With Spectacles   [ Time Frame: Enrollment to 18 Weeks ]
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  Serious Adverse Events
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  Other Adverse Events
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  More Information
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Certain Agreements:  
Principal Investigators are NOT employed by the organization sponsoring the study.
There is NOT an agreement between Principal Investigators and the Sponsor (or its agents) that restricts the PI's rights to discuss or publish trial results after the trial is completed.


Limitations and Caveats
Limitations of the study, such as early termination leading to small numbers of participants analyzed and technical problems with measurement leading to unreliable or uninterpretable data
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Results Point of Contact:  
Name/Title: Raymond Kraker, MSPH
Organization: Jaeb Center for Health Research
phone: 813-875-8690
e-mail: pedig@jaeb.org


No publications provided


Responsible Party: Jaeb Center for Health Research
ClinicalTrials.gov Identifier: NCT00669539     History of Changes
Other Study ID Numbers: NEI-139, 2U10EY011751
Study First Received: April 28, 2008
Results First Received: April 16, 2012
Last Updated: May 31, 2012
Health Authority: United States: Federal Government