For many, coloured overlays make reading easier. When the correct colour is placed over reading material there is an immediate reduction in the glare of the white page and the contrast of the black text on white paper. In addition, the pattern of the text and the letters is altered so it no longer triggers perceptual distortions. The result is a page that is easier to look at, and thus easier to read.  


Opticalm carries a wide selection of overlay colours from several suppliers to provide a full range of options to meet our client’s needs.  See our "About Overlays" section for more information.

Ashley ruler overlays: Single Colour – Pack of 4

  • Ashley ruler overlays have been developed to provide a deeper coloured overlay for people who find they need to double up the lighter overlays to reduce brightness. These ruler overlays were not designed to be double up as they are quite saturated. 


    These ruler overlay sets are available in red, orange, yellow, green, aqua, blue, purple, pink and grey. Please select your colour. 

Opticalm Visual Stress Clinic

160 Terence Matthews Cres., Suite A1, Main Floor

Kanata ON K2M 0B2

Tel: 613-294-6437

Fax: 613-254-9206

By appointment only

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