I’m an Irlen screener so assess students for the use of colour, it’s really important to get the correct colour/combination of colours for the students. I completed the training due to the number of students requesting coloured paper, which was becoming unmanageable for teachers AND the exams team.
I’d definitely recommend using a screenveil. If you use Read Write Gold, there’s one on there, or a free download is ‘Colorveil (Eastec). Also would recommend using the coloured reading rulers, we get ours from Crossbow too, plus the overlays.