A significant body of research supports its use in alleviating asthenopic symptoms (eye strain). Buying Guide: Pricing and Availability

The Mallett Unit is a staple tool in optometric practices, specifically designed to investigate cases of —a condition where the eyes struggle to maintain alignment during visual tasks. If you are looking to purchase one, this guide covers the essential features, current market pricing, and where to find both new and pre-owned models. Key Features of the Mallett Unit

It identifies the "aligning prism" (associated phoria) required to neutralize subjective disparity, making it a direct guide for prescribing therapeutic prisms.