The recommended Colorimetry assessment process follows a 3 stage protocol:
It is essential that every individual who struggles to read or believes they may suffer from symptoms of Visual Stress, first undergoes a full eye examination. This is important to rule out any ocular problems. This test is available free of charge for all school aged children, under NHS provision.
Having ascertained that ocular problems are not the cause of symptoms, an overlay assessment is recommended. An assessment with overlays may already have been carried out in school. If the school does not use overlays an optometrist can also carry out this assessment. The optometrist may suggest the patient use an overlay and return within a few weeks, noting any improvements.
Any improvement in reading speed and accuracy of 15% and above can be considered a successful outcome.
Following successful use of a coloured overlay, for a trial period, the Intuitive Colorimeter is used to assess the patient under the direction of an optometrist, and a precision tint may be prescribed as appropriate. The colour will be specific to each individual’s needs, much more precise than an overlay and very often a different colour to the overlay. Coloured lenses are also much more convenient than overlays for board and computer work.