Share this article on

ChromaGen™ is patented, trademarked and USA Food & Drug Administration cleared. The patented diagnostic system is used by trained professionals for the management of Academic Skills Disorder (ASD™).

ASD™ is an umbrella term that includes dyslexia, colour deficiency, dyspraxia (lack of coordination; clumsiness), and other learning related difficulties. In some cases, ChromaGen has also been known to help migraine sufferers. ChromaGen is a system of eight coloured haploscopic filters of a known density and colour hue which, when prescribed to sufferers of ASD™, has been proven to improve these disorders. It is important to note that currently I only prescribe these contact lenses for Colour Vision Deficiency, not other aspects of ASD. Here you can read my general portfolio Andrew D Price FBDO(Hons)CL MBCLA If you would like to discuss attending one of my clinics to be assessed with these lenses please email This email address is being protected from spambots. You need JavaScript enabled to view it.

They can be used to enhance colour discrimination for people who have some forms of Colour Vision Deficiency or are sometimes termed ‘colour blind‘

ChromaGen was developed by David Harris at the Corneal Laser Centre for Colour Blindness at Clatterbridge Hospital in Cheshire. Dr. Chaaban Zeidan, an optometrist from Tamworth together with Cantor & Nissel further developed ChromaGen for dyslexia, resulting in patent approval in 1997.

With the ChromaGen Lenses you may pass the Ishihara Test and other colour vision tests, responses are varied from person-to-person: “The ChromaGen™ system of lenses has been awarded Millennium Product status [by the Design Council in Britain] to recognize forward thinking, challenging, creative and innovative products,” and “highlights the best of British inventions.”

ChromaGen™ and Colour Deficiency

Colour Vision Deficiency, also known as colour blindness, is an optical condition in which affected people have a deficiency in one or more of the primary colours (red, green, or blue) recognized through the retina. Ten percent of males and 0.6 to 0.8 percent of women are colour deficient. Colour deficiencies can be grouped into the following categories: Deutrans (lack in green receptors), Protans (lack in red receptors), Tritans (lack in blue receptors), Monochromatics (sees only 1 pigment), and Achromatics (has no functioning cones). Defective colour vision can range from near-normal ability to distinguish colours, where typically the chemical for seeing red or green is slightly altered, to a high degree of confusion, where the chemical balance is considerably altered.

Up to 97% of people reported an enhancement to their colour vision discrimination. For people with Colour Vision Deficiency, ChromaGen haploscopic filters work by changing the amount of specific colours going into one or both eyes, which enhances colour discrimination.

ChromaGen™ users with colour deficiency testify:

“I realized that some cars I thought were black were navy blue or dark green. As I looked around, it was as if colours popped out at me, especially orange, pink and fuchsia. I will be able to see colours I was lacking.” – Nick A., New York

“I used to think I had a genetic defect that just couldn’t be helped. Now I see everything in a new light. Flowers are just so astonishingly beautiful they take your breath away.” – A. Bristol, GP

How ChromaGen™ Works

In cases of colour deficiency, ChromaGen changes a specific wavelength of light going into the non-dominant eye and, in some cases, both the dominant and non-dominant eye, enabling enhanced colour discrimination. The specific filter, found through individual patient testing, selectively reduces certain wavelengths of light from reaching the retina, thereby allowing better discrimination of other wavelengths of light (colours), it does not aim to reproduce the same sensation of colours that non-Colour Vision Deficient people see.   

Read here what recent users are saying:

"To Whom It May Concern, after a consult with my eye doctor, I recently received a pair of ChromaGen contact lenses to help with my colour blindness from my optometrist. I am pleased to share with you the results. I have successfully been able to pass the Ishihara test. These results far exceeded my expectations. I am still learning to identify certain colours and get the most out of this amazing lens, but I have only been using it for a few days. I am absolutely thrilled and I want to thank you so much for your product. I would be more than willing to give a review or testimonial about these lenses for colour blindness to anyone and everyone who asks."

Recent research published in Ophthalmic and Physiological Optics by Helen Swarbrick and others at the University of New South Wales, Sydney, has confirmed that the ChromaGen system may improve colour perception in subjects with Colour Vision Deficiencies.

The researchers used a range of colour vision tests including the Ishihara, Farnsworth Munsell D-15, Farnsworth lantern test and subjective responses on a visual analogue scale. The results showed that there was a highly significant improvement in the Ishihara and D-15 results, but not in the lantern test. Judgement of distance and motion were only slightly affected and, subjectively, the subjects reported improved colour perception but as the lenses were tinted they felt that their vision was altered in dim light.

The researchers concluded that ChromaGen lenses enhance subjective colour experience and assisted in certain colour-related tasks, but were not indicated as an aid in occupations where colour-vision related restrictions were in place.

Share this article on