Objective: To develop a tool for assessing amblyopic risk and monitoring the treatment effect of propranolol in periocular haemangioma management.
Methods: We present a study of nine children with periocular haemangioma who underwent propranolol treatment at York Hospital between 2009 and 2013.A proposed measure of amblyogenic risk based on the induced anisometropia resulting from a periocular haemangioma was calculated in the form of a single quantitative value, measured in dioptres. This calculation used published work and developed it to produce a new function, termed the delta defocus equivalent (DFE-∂).Refraction measurements were retrospectively collected from patients' notes in order to measure the trend of DFE-∂ over the treatment period with propranolol.
Results: The average DFE-∂ at commencement of propranolol was 1.54 (±0.62) D. The average at the end of treatment was 0.39 (±0.38) D.
Conclusion: This work presents a possible tool for assessing amblyopic risk in cases of periocular infantile haemangioma. The DFE-∂ gives a measure in dioptres, which may represent the true amblyopic risk, and so be useful in supporting treatment decisions in paediatric ophthalmology.