Letter: Colour not a placebo

It would be interesting to see what criteria Professor Brendon Barrett and colleagues from Bradford University used in order to conclude colour overlays and filters only have a placebo effect.

There is a definite improvement in reading with the colour overlays than without one, of that there is no doubt and the brain’s recognition of colour/frequency within the visible spectrum.

In practice I have found the reader’s performance level to a specific colour overlay better than another.

I have found the performance of the reader changes with different colour overlay in that the number of mistakes made per colour overlay changes, the speed of reading changes, accuracy changes, word recognition changes, reading with punctuation changes and the verbal expressions used changes.