Whilst coloured overlays are a useful tool, they may not offer the best long-term solution. Precision tinted spectacle lenses may prove more beneficial when copying from the board or from another book for example. The colour of these spectacle lenses is usually different from the colour chosen as an overlay.

The Intuitive Colorimeter was scientifically designed to present sequentially the colours in colour space, thereby allowing a patient to swiftly identify the precision colour to best alleviate their symptoms.