Prisms: a love/hate relationship

This video describes how professional perceptions of the value of prisms to treat defects of binocular vision can differ. When are they a lifeline? - or an unnecessary crutch? Prof Anna Horwood, an experienced orthoptist, will cover prism therapy in various binocular vision anomalies. There is a surprisingly weak evidence base for their value, efficacy and long-term outcomes, despite them being a mainstream treatment with undoubted value.