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Authors
Jonathan M. Holmes, B.M., B.Ch., Michele Melia, Sc.M., Yasmin S. Bradfield, M.D., Oscar A. Cruz, M.D., Brian Forbes, M.D., Ph.D.

Factors Associated with Recurrence of Amblyopia on Cessation of Patching

publication date
2007 Mar 23
Category
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Abstract/Introduction

Purpose

In a prospective observational study, we previously reported that weaning (tapering or gradually reducing) treatment in children treated with 6 to 8 hours of daily patching for amblyopia resulted in a 4-fold reduction in odds of recurrence. We now report the association of additional factors with recurrence or regression of amblyopia in 30 this same cohort.

 

Design

Prospective, nonrandomized, observational study.

 

Participants

69 children aged less than 8 years, with successfully treated anisometropic or strabismic amblyopia (improved at least 3 logarithm of the minimum angle of resolution (logMAR) lines).

 

Methods

Patients were enrolled at the time they stopped patching for amblyopia. Patients were classified according to whether patching was stopped abruptly or weaned prior to cessation. They were followed off treatment for 52 weeks to assess recurrence of amblyopia.

 

Main outcome measure

Recurrence of amblyopia defined as a 2 or more logMAR level reduction of visual acuity from enrollment (cessation of patching), confirmed by a second examination. Recurrence was also considered to have occurred if treatment was restarted with a 2 or more logMAR level reduction of visual acuity even if it was not confirmed by a second examination.


Conclusion/Results

Results

The risk of recurrence was higher with better visual acuity at the time of cessation of treatment (adjusted risk ratio (RR)=0.68 per line of worse visual acuity (VA), 95% confidence interval (CI)=0.51, 0.90), a greater number of lines improved during the previous treatment (adjusted RR=1.5 per line increase, 95% CI=1.1, 2.0), and a prior history of recurrence (adjusted RR=2.7, 95% CI=1.5, 4.9). Orthotropia or excellent stereoacuity at the time of patching cessation did not appear to have a protective effect on the risk of recurrence.

 

Conclusions

The higher risk of recurrence in the most successfully treated children with amblyopia and absence of protection from orthotropia and excellent randot dot stereoacuity suggests that careful and prolonged follow-up is needed for all children who have been previously treated for amblyopia.


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