There is evidence to support the use of translucent coloured sheets and TINTED lenses for those who struggle with reading. This is called many things for example

Meres – Irlen Syndrome, Scotopic Sensitivity Syndrome and Near Vision Stress. The accuracy and reproduction of the colour is important and can be done well with only 1 or 2 commercially available systems. We currently use the Cerium Intuitive Colourimeter.
Some DYSLEXICS (  also experience these issues along side their dyslexic issues.
Colourimetry Examinations start at £100. We also recommend a binocular vision examination and routine eye examination prior to Colourimetry. 
Please see the link below for the latest review on this matter;