Irlen.wikiAn independent record of the Irlen Institute, the Irlen Method and the evidence about them

Colored overlays

From Irlen.wiki, an independent record of the Irlen Institute, its colored overlays and filters, and what researchers say

Researched and compiled by the Irlen Wiki editorial team · First published · Revised

In brief: Irlen Colored Overlays are transparent colored sheets, in ten colors, placed over print; the Institute calls them the first step in its method, but a 2011 controlled study found no immediate reading benefit.[1][6]

A note on independence: Irlen.wiki is an independent record compiled from irlen.com, irlensyndrome.org, public records and published research. It is not operated by the Irlen Institute, sells nothing and gives no medical or educational advice. The Institute’s statements are attributed to it and shown beside independent assessments. Sourcing rules: editorial policy.

What the overlays are

Irlen Colored Overlays are transparent colored plastic sheets placed over a printed page or screen. The Institute calls them the original colored overlay technology and says they are the first step in finding out whether the method helps, and that they work best for people whose difficulties are limited to reading.[1]

Colors

The Institute lists ten overlay colors.[1]

  • Turquoise
  • Blue-gray
  • Aqua
  • Grey
  • Rose
  • Peach
  • Goldenrod
  • Yellow
  • Purple
  • Green

A screener or diagnostician chooses the color, and the Institute says people may use a combination of overlays.[1][2]

Irlen Clings

For screens, the Institute sells Irlen Clings, overlays with an optical-grade clear adhesive that stick to computer screens, phones, tablets and e-readers.[1]

What the Institute claims

The Institute says overlays can improve print clarity and stability, reduce strain and fatigue, eliminate headaches, improve comprehension and tracking, and speed up reading. It says they are used by more than 4,000 school districts and over one million people, and quotes researchers and journals, including a claim of reading gains of 1 year 8 months to 2 years 8 months after three months.[1] These figures are the Institute’s.

Overlays and dyslexia

The Institute’s overlay page warns against selling overlays as a dyslexia treatment, says dyslexia is a language processing problem rather than a visual one, and says overlays help only where a visual processing problem is also present.[1] That matches the professional consensus that dyslexia is language-based.[3] See Irlen and dyslexia.

How a color is chosen, and overlays versus lenses

The Institute says a certified screener or diagnostician picks the overlay color using a systematic assessment protocol, and that the overlay goes home with the client after the first session.[1][4] It recommends overlays for difficulties limited to reading and says people with problems in writing, math, depth perception, night driving or bright environments should consider tinted filters instead. It cautions against buying glasses tinted to match an overlay, saying the lens color will be different and a wrong tint can increase symptoms.[1]

The Institute explains the overlays’ effect by saying that people with Irlen Syndrome or visual stress have a hyperactive visual cortex and that overlays reduce contrast on the page.[1] That explanation is the Institute’s; EyeWiki describes cortical hyperexcitability as a research hypothesis for visual stress, not an established mechanism for Irlen syndrome.[5]

Evidence

The main controlled test of Irlen overlays, published in Pediatrics in 2011, compared each child’s prescribed overlay with a non-prescribed color and with no overlay and found no evidence of an immediate benefit on reading rate.[6] Outside the Irlen system, colored overlays have been studied for visual stress with mixed results.[5] See scientific assessment.

Common questions

How many colors do Irlen overlays come in?

Ten, according to the Institute.

What are Irlen Clings?

Adhesive colored overlays for phones, tablets and computer screens.

Do Irlen overlays help dyslexia?

The Institute says not by themselves, because dyslexia is a language problem; a 2011 trial found no immediate reading benefit from Irlen overlays.

Further pages

Citations

  1. ^ a b c d e f g h i j Irlen colored overlays. Irlen Institute (irlen.com). Retrieved 9 November 2026.
  2. ^ Testing & treatment. Irlen Institute (irlen.com). Retrieved 9 November 2026.
  3. ^ Learning disabilities, dyslexia, and vision. Pediatrics 127(3):e818–56 (2011). Handler SM, Fierson WM et al., via PubMed. Retrieved 9 November 2026.
  4. ^ FAQs. Irlen Institute (irlen.com). Retrieved 9 November 2026.
  5. ^ a b Meares-Irlen syndrome/visual stress (MISViS), reviewed 25 September 2026. EyeWiki, American Academy of Ophthalmology. Retrieved 9 November 2026.
  6. ^ a b Irlen colored overlays do not alleviate reading difficulties. Pediatrics 128(4):e932–8 (2011). Ritchie SJ, Della Sala S, McIntosh RD, via PubMed. Retrieved 9 November 2026.