Researchers at the University of Birmingham have developed a contact lens that may help people with colour blindness simply by using a low cost dye, according to research published in the journal Advanced Healthcare Materials.
Colour blindness – or colour vision deficiency (CVD) – is an inherited genetic ocular disorder where some people have difficulty distinguishing certain colours. While no cure for this disorder exists, several methods have been used to increase the colour perception of those affected. However, current products on the market such as colour filtering glasses are expensive, bulky and incompatible with other vision corrective glasses.
Normal colour vision is trichromatic – this means any colour can be created by combining the colours blue, red and green, which are perceived by a cluster of cones at the back of the eye. These cones are divided into three groups, responsible for short wavelengths – blue – medium wavelengths – green – and long wavelengths – red. In normal vision all three are present. When any of these cones are missing, the brain receives incorrect information leading to limited ability to identify certain colours in some people.
Several companies are already selling glasses and custom made lenses for colour blindness correction which can be expensive for many users, however, in this research an inexpensive soft commercial contact lens was dyed with a non-toxic rhodamine derivative dye. This particular derivative of rhodamine was chosen as it is known for its ability to absorb certain wavelengths of light in the optical spectrum. Researchers found that the dye blocked the band that lies between the red and green wavelengths, which is perceived by two sets of corresponding optical cones simultaneously. The removal of this band through the dyed lens inhibited the simultaneous triggering of the cones designated for green and red wavelength bands, enabling better differentiation between red and green colours.
The dyed lens was tested on people with red-green colour vision deficiency (the most common form of CVD). The dyed contact lens was applied to a glass slide. The participants were asked to look at several numbers through the dyed lens, and to note whether there were any improvements to the colours or the clarity of the number. They were also asked to observe their surroundings and note whether they saw any improvements in their colour perception.
The results verified that dye tinted lenses can be used to enhance the colour perception of people affected by colour vision deficiency. Further patient studies are now underway.
Dr Haider Butt, lead researcher from the University of Birmingham’s Department of Mechanical Engineering and the Institute of Healthcare Technologies., said: ‘Contact lenses are of interest for colour blindness correction because it is easier to correct the entire field of view. The dye processing we carried out does not need any complex preparation, it is not toxic to the human eye, and our method could be easily used in both glasses and contact lenses at low cost.’
He continued: ‘We are now looking into using a similar process to correct purple-blue colour blindness, and also to bring together a number of dyes to make lenses perform for both red-green and purple-blue colour blindness simultaneously. We are about to commence human clinical trials shortly.’
The Latest on: Colour blindness
via Google News
The Latest on: Colour blindness
- 'Color Blind' Assessments of Grant Proposals Don’t Work. Here’s a Better Idea.on October 29, 2019 at 7:52 am
What I did not realize then was how colorblind application of financial assessment and funding practices can make it harder for organizations led by and serving people of color to get grants and make ...
- Piglet, the deaf blind pink puppy becomes a role model for toleranceon October 24, 2019 at 8:01 am
Piglet, the deaf blind pink puppy was rescued from a hoarding situation in Georgia along with his mother and 3 litter mates. He is a Dachshund Chihuahua mix, and the product of two dapple colored ...
- What do you understand from the term colour blindness?on October 23, 2019 at 2:11 am
If yes, you’ll probably be able to understand how a colour blind person perceives colours. Such people may see no or few colours. But imagine, they have no idea whether or not how they think a colour ...
- Man With Color Blindness Develops Empowering Appon October 22, 2019 at 5:01 pm
This man with color blindness developed Color Blind Pal—an app to help people navigate the world in color. This video, "Man With Color Blindness Develops Empowering App", first appeared on nowthisnews ...
- No Rome is a ‘gender-blind’ singeron October 22, 2019 at 9:12 am
I try to change the color of my hair every six months ... Add to that what is described as Rome’s “charismatic performance ability.” “I am a ‘gender-blind’ musician,” confessed Rome. “My music is ...
- S/Africa: Resignation of mayor a victory for “colour-blind white caucus” – EFFon October 22, 2019 at 6:25 am
South Africa’s militant opposition Economic Freedom Fighters (EFF) has expressed disappointment over the resignation of Johannesburg mayor Herman Mashaba from office, saying Tuesday that his departure ...
- Is Russia’s Vladimir Putin Color-Blind?on October 22, 2019 at 3:29 am
The Kremlin’s hardline approach to Russian opponents has rekindled a prolonged debate among Western officials and analysts as to whether the Russian leader really is color-blind and does believe ...
- Meet New Zealand's most famous blind keyboard playerson October 18, 2019 at 9:20 am
Strange to think of New Zealand's most famous and hardest-working blind keyboard players being introduced to each other and shaking hands in their world without sight. Hore has never seen anything.
- The way you see colour depends on what language you speakon October 17, 2019 at 9:58 am
Some people can't see differences in colours – so calledcolour blindness– due to a defect ... vision' causing us all to experiencethe same colour in slightly different ways ...
via Bing News