Hi,

I got tested for Irlin as a cause for migraines. It involved looking at lots of patterns and pages of words and numbers, and trying out the different tints for the lenses to see what colours made a difference (putting a tinted sheet over the paper and working out what colours make the images sharper)
It is not widely accepted or still considered experimental - one doctor I spoke with thought it was hogwash. And interestingly, the glasses or assessment were not covered by my health insurance. But I have a friend whose son (a teen) has the glasses and it has made a world of difference to him.
In the end I didn't get glasses, but adjusted the colour and brightness settings on my computer screen, as that seemed to be the culprit for me.