15 September 2019, Dubai: Colour blindness is one of the most misunderstood and ignored eye conditions, which can have a huge impact on a person’s life.
From making even the simple act of choosing in-season fruits and vegetables, shopping for clothes or crossing the street at traffic light, colour blindness can be a dominant factor in how you experience the world around you.
With World Colour Blind Awareness Day falling on September 6th, doctors at Moorfields Eye Hospital Dubai hope to raise awareness of the condition in order to offer advice, dispel common misconceptions and remove any stigma.
Affecting men more than women, colour blindness can hinder a person’s chances of enrolling in the police or military, taking on jobs that involve driving and even impact their academic performance.
Dr. Avinash Gurbaxani, Consultant Ophthalmologist, specialist in Uveitis, Medical Retina and Cataract Surgery at Moorfields Eye Hospital Dubai, describes colour blindness as a reduced ability to distinguish between colours.
“Colour blind individuals do not see everything in ‘black and white’ but merely perceive colours differently from unaffected individuals,” he said.
Red-green and blue-yellow color blindness are the most common forms of the condition along with total color blindness. In people of northern European descent, red-green colour blindness affects up to 8% of men and 0.5% of women.
Symptoms can vary from person to person, said Dr. Avinash: “Some people will have no symptoms as they have learnt to distinguish colours in spite of their colour vision deficiencies (CVD).
“Others, however, may find they are colour blind after testing for jobs or entering recruitment into national service etc. Some may also find it difficult to see the difference between shades or colours.”
Simple clinical testing with Ishihara plates (coloured plates that test the extend of a person’s CVD) is used for red-green colour blindness, but more detailed tests like the colour assessment and diagnosis (CAD) or 100 Hue test can isolate the type of CVD,” said Dr. Avinash.
The cause of colour blindness can be genetic, with a person suffering throughout their life, although it can also develop as the result of disease.
“The causes of colour blindness may be genetic and present from birth, the most common is X linked red-green colour vision deficiency (CVD). However, it can be acquired due to a disease of the optic nerve such as optic neuritis or multiple sclerosis or diseases of the retina,” said Dr. Avinash.
Although there is no cure for the genetic causes of colour blindness and most individuals have relatively few symptoms, some treatments are available, said Dr. Avinash.
“Certain tinted contact or eyeglasses lenses may help depending of the type of CVD you have, although this may improve recognition of some colors, it can make other more difficult to distinguish. For acquired cases of colour blindness, prompt treatment of the underlying cause is advocated.
“Occupational counselling can be advised for cases of known CVD as certain jobs like pilots, train drivers etc are not suitable for these individuals. There are even a few smartphone apps that help distinguish colour for those who have difficulty doing so.”
Moorfields Eye Hospital Dubai can offer the full range of tests to determine the exact kind of colour blindness a patient is suffering from with expert staff on hand to advise on the best approach to manage colorblindness
What your eyes tell you about your health?
This week’s blog on ‘What your eyes tell you about your health’ has been contributed by Dr. Luisa Sastre, Specialist Ophthalmologist in Medical Retina.
“Do you have sleep problems?” the doctor asked while examining my eyes. “Yes, I do. How can you know that? “I replied in amazement.
Even though I slept well last night and my eyes were white and quiet, I still had that mild discomfort in my right eye that feels like a pricking sensation, right after I woke up.
The Doctor replied “I know because you have some very subtle punctate erosions on the surface of your inferior cornea. The pattern suggests that your eyelids could be open while you are sleeping and so the surface of your eye would be exposed to the environment and get dry”.
Then the doctor held my eyelashes and pulled a little bit. “You have loose elastic upper eyelids. They can easily open while you are asleep, causing the surface of your eye to get dry. That’s why you are getting this pricking sensation in your eyes, right when you wake up. As the day goes on, normal blinking will spread your natural tear over the surface of the eye, reducing the discomfort. Nonetheless, we would need to start a treatment plan to help treat this condition”.
The doctor knew very well the association between obstructive sleep apnea, floppy eyelid syndrome and the patient’s profile ; overweight, middle-aged male. The treatment recommended included not only eye lubricants, but a referral to the pulmonologist expert in sleep apnea and to the oculoplastic surgeon.
This is just an example of an association between eye conditions and other problems in any part of your body. Some of these classical associations are diabetes and hypertension. The eye doctor can tell how good or bad your sugar or blood pressure control has been, just by looking inside the eye, through that little window called the pupil. Indeed every diabetic person should have regular eye examinations, with dilation of the pupil, to assess the retina’s health.
In the same way itchy red eyes can come along with flare ups of certain skin conditions, like atopic dermatitis or rosacea.
People under a lot of stress and those with sleep disturbances like insomnia or type A behaviour (aggressive and competitive personalities) are more likely to develop a condition in the eye called central serous chorioretinopathy (CSC). CSC can significantly impair your vision. So your eye doctor once again, will not only give you appropriate advice for your eyes, but also refer you to a sleep expert or to a psychologist, in order to have a comprehensive approach to your problem.
Examples of common associations:
- If you suffer a sudden drop in your vision and you are diagnosed with a vascular occlusion in your retina, you could be found to have high cholesterol and other cardiovascular conditions. So a prompt correction of your cholesterol levels can save you from future threats such as a heart attack and brain stroke.
- Not being able to see in a certain part of your visual field could mean a tumor might be compressing certain structures in your brain.
- If the whites of your eyes get yellow, you could have liver problems.
- If your eyes are red, painful and your vision is impaired and you are diagnosed with a condition called uveitis, you could also be found to have rheumatic diseases.
The list can go on, hence the Conclusion is; visit your eye doctor regularly as he/she is much more, than just an eye doctor!!