Mrs Elizabeth Ralph

Professional Services Consultant
Contact Lens Specialist


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Dry Eye Clinic Video

Latest News

LATEST NEWS! This column will carry the latest news for ADP-EyeCare patients and/or prospective patients. 

23/05/2020:  Dry Eye Clinic Video published - watch here.

03/05/2020:  Remote non-urgent consultations with Andrew D Price, now available 7 days/week, day or evening by phone or Webcam Consult. Send initial email to  

03/05/2020: A collaborative agreement between private ophthalmology and Andrew D Price at the Dry Eye/Contact Lens Clinic of ADP-EyeCare at Focus-In Opticians of Rhyl. See more.

04/04/2020: Lipiflow page discusses treatment. See In-Practice/Clinic Professional Treatments under Dry Eyes Clinic menu-point.

25/03/2020:  New feature of the ADP-EyeCare website is the downloadable, savable, optionally printable Contact Lens Referral documents with all fields open for text. Go to ADP-EyeCare where you will find it under the Contact Lens Menu Point.

15/03/2020: Latest Covid-19 guidance for professionals and patients in regard to contact lens and spectacle wear can be fiund here

22/02/2020: New feature of the ADP-EyeCare website is the downloadable, savable, optionally printable Dry/Watery Eye/Blepharitis Referral documents with all fields open for text. Go to ADP-EyeCare where you will find it under the Dry/Watery Eye Menu Point.

05/02/2020: The use of two new instruments for diagnosis and treatment of dry eye and contact lens discomfort included in appointments - Me-Check and MyMask. See Mr Andrew D Price - Portfolio.

22/01/2020 ADP-EyeCare announce a new dry eye clinic will commence in Stoke-on-Trent in the first week of March 2020, in addition to the current one in North-Wales. To find out more email Andrew D Price FBDO(Hons)CL , COA:  

07/01/2020: Contact lens wearers who would like to improve their hours of comfort please see 'Clinical Trials - Can You Help?'

28/12/2019: 'Monovision' where one eye is corrected for distance and the other for near, is sometimes an option for cataract/refractive surgery. It is vital you have the opportunity to judge if this is suitable for you before surgery, this can be done easily as part of the Cataract or Refractive Surgery Referral Clinic. The 'target' prescription is then known in advance and is provided to the surgeon.

07/12/2019: Mrs Elizabeth Ralph FBDO CL joins ADP-EyeCare, providing specialist services in the East Midlands. 

28/10/2019: Do you have Colour Blindness/Colour Vision Deficiency (CVD)? A unique contact lens is available that may help you differentiate colours more easily. Read more. Email:   

26/10/2019:  Wear glasses/contact lenses currently and would like to consider reducing or eliminating your need for them by refractive surgery, or you require cataract surgery and thinking of a private procudure? We can offer information and examinations to assess your sutability. Email: 



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About ChromaGen™ Contact Lenses for Colour Vision Deficiency (CVD)

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. I may be able to provide practice contact details that specialises does. If you would like to discuss attending one of my clinics to be assessed with these lenses email This email address is being protected from spambots. You need JavaScript enabled to view it.

They can be used to enhance colour perception and colour discrimination for people who are ‘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 blindness tests: “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.”

Colour blind patients have reported:

"Hi Haim, Well I have passed my medical exam so I am extremely relieved as although I have to do a medical exam every 2 years, the colour vision does not require retesting until 6 years time. I could not have passed the medical without the use of the lenses."

ChromaGen™ and Colour Deficiency

Colour 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.

In clinical trials, over 97% of colour blind people reported a significant enhancement to their colour vision and their everyday lives. For people suffering from colour deficiency or 'colour blindness', ChromaGen haploscopic filters work by changing the wavelength of each colour going into one or both eyes, which enhances colour perception and 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 the level of each colour going into the non-dominant eye and, in some cases, both the dominant and non-dominant eye, enabling enhanced colour perception and colour discrimination.

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 improves colour perception in colour blind subjects.

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 enhanced subjective colour experience and assisted in certain colour-related tasks, but were not indicated as an aid for in occupations where colour-vision related restrictions were in place.

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