Complex sentence: Irlen Spectral Filters or Irlen Lenses, are coloured overlay filters or person specific tinted lenses worn as glasses or contact lenses that are intended to help people with the supposed perceptual processing difficulty known as Irlen Syndrome, also known as Scotopic Sensitivity Syndrome or visual stress.
Split into simpler sentences: Irlen Spectral Filters or Irlen Lenses, are coloured overlay filters or tinted lenses crafted specifically for the wearer and worn as glasses or contact lenses. They are intended to help people with the supposed perceptual processing difficulty known as Irlen Syndrome, also known as Scotopic Sensitivity Syndrome or visual stress.