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The clinical profile of moderate amblyopia in children younger than 7 years
Insights
This study analyzed children with moderate amblyopia, finding similar visual impairment regardless of cause. Treatment practices for patching varied significantly among participants in the Amblyopia Treatment Study 1.
Area of Science:
- Ophthalmology
- Pediatric Ophthalmology
- Clinical Trials
Background:
- Amblyopia, or "lazy eye," affects visual development in children.
- Moderate amblyopia can result from strabismus, anisometropia, or a combination.
- Understanding patient characteristics is crucial for effective amblyopia treatment.
Purpose of the Study:
- To characterize the demographic and clinical profiles of children with moderate amblyopia.
- To analyze the causes and visual acuity in a cohort from the Amblyopia Treatment Study 1.
- To describe initial treatment variations in patching duration.
Main Methods:
- Enrolled children <7 years with moderate amblyopia (visual acuity 20/40-20/100).
- Included strabismic, anisometropic, or combined amblyopia types.
- Analyzed 409 children meeting study criteria.
Main Results:
- Mean age was 5.3 years; causes were evenly split between strabismus and anisometropia.
- Visual acuity in amblyopic eyes was similar across groups, but sound eye acuity differed.
- Patching duration varied, with poorer acuity eyes receiving longer patching times.
Conclusions:
- Strabismic and anisometropic amblyopia occurred in nearly equal proportions.
- Visual impairment severity was consistent across different amblyopia etiologies.
- Significant variability existed in prescribed initial patching hours.
Objective:
To describe the demographic and clinical characteristics of a cohort of children with moderate amblyopia participating in the Amblyopia Treatment Study 1, a randomized trial comparing atropine and patching.
Methods:
The children enrolled were younger than 7 years and had strabismic, anisometropic, or combined strabismic and anisometropic amblyopia. Visual acuity, measured with a standardized testing protocol using single-surround HOTV optotypes, was 20/40 to 20/100 in the amblyopic eye, with an intereye acuity difference of 3 or more logMAR lines. There were 419 children enrolled, 409 of whom met these criteria and were included in the analyses.
Results:
The mean age of the 409 children was 5.3 years. The cause of the amblyopia was strabismus in 38%, anisometropia in 37%, and both strabismus and anisometropia in 24%. The mean visual acuity of the amblyopic eyes (approximately 20/60) was similar among the strabismic, anisometropic, and combined groups (P =.24), but visual acuity of the sound eyes was worse in the strabismic group compared with the anisometropic group (P<.001). For the patients randomized into the patching group, 43% were initially treated for 6 hours per day, whereas 17% underwent full-time patching. Patients with poorer visual acuity in the amblyopic eye were prescribed more hours of patching than patients with better acuity (P =.003).
Conclusions:
In the Amblyopia Treatment Study 1, there were nearly equal proportions of patients with strabismic and anisometropic amblyopia. A similar level of visual impairment was found irrespective of the cause of amblyopia. There was considerable variation in treatment practices with regard to the number of hours of initial patching prescribed.