If you have any concerns about your eyesight, or the eyesight of someone else that you care for, you should consult an optometrist in case there are any vision problems that have not been recognised.
According to Lewis et al (Date unknown),
“The term Visual Stress is sometimes used to refer to the collection of symptoms and signs of visual fatigue when reading that are reduced when colour is used as therapy. Other terms are Meares-Irlen syndrome, Irlen syndrome or Scotopic Sensitivity Syndrome (SSS). (The syndrome is not yet widely recognised by the medical and scientific communities, and there is no universal agreement on its name.)”