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The sensitive period for strabismic amblyopia in humans
M Epelbaum1, C Milleret, P Buisseret
1Service d'Ophtalmologie, Groupe Hospitalier Necker-Enfants Malades, Paris, France.
Insights
The sensitive period for treating strabismic amblyopia is before age 3. Early intervention with monocular occlusion yields the best visual acuity recovery in children, with effectiveness diminishing significantly by age 12.
Area of Science:
- Ophthalmology
- Developmental Neuroscience
Background:
- Strabismic amblyopia is a common cause of reduced vision in children.
- Identifying the sensitive period for treatment is crucial for effective intervention.
Purpose of the Study:
- To determine the sensitive period for treating strabismic amblyopia.
- To investigate the age-related susceptibility to monocular occlusion therapy.
Main Methods:
- A cohort of 407 children aged 21 months to 12 years received monocular occlusion treatment.
- Treatment efficacy was quantified by the reduction in amblyopia severity.
Main Results:
- Occlusion therapy was most effective when initiated before 3 years of age.
- Visual acuity recovery decreased with increasing age at treatment onset.
- Treatment showed minimal effectiveness by 12 years of age.
Conclusions:
- The findings suggest a sensitive period for strabismic amblyopia in humans, extending up to approximately age 12.
- Results align with neurophysiological mechanisms of amblyopia observed in animal models.
Purpose:
In order to assess the sensitive period for strabismic amblyopia, the period of susceptibility to monocular occlusion was investigated in 407 children who ranged in age from 21 months to 12 years.
Methods:
Patients were treated between 1975 and 1990 by occlusion of the best eye. The efficiency of the treatment was measured as the ratio of reduction of the amblyopia at the end of the occlusion.
Results:
The efficiency of the occlusion is shown to depend on the age of the onset of the treatment: recovery of acuity of the amblyopic eye was maximum when the occlusion was initiated before 3 years of age, decreased as a function of age and was about null by the time the patient was 12 years of age.
Conclusion:
This is assumed to be an indication of the sensitive period for strabismic amblyopia in humans. The results are discussed on the basis of the neurophysiological mechanisms of amblyopia established in animals.