I got tested for Irlen lenses( there is information about this on the net, Donna Williams also mentions it in one of her books)
Four colours were combined then added to my prescription. The colour of the lenses turned out grey (how exciting).
However, when they were sent to me, I tried them and found that they got the axis wrong, so wrong prescription.
When I go back to WA I will have to make another appointment. :: sigh ::