Dr. Shalu Pal

  • "If you want quality and wonderful service, please go to Dr. Shalu Pal! The patience, care, and true concern that Dr. Pal has for her clients is wonderful. "

    --Seleena J
  • " I was pleasantly surprised by finding a hidden gem within Dr. Pal's office"

    --Naveed
  • "Finally a doctor who is extremely knowledgeable, patient and explains things clearly. She is a wonderful human being who really takes the time to care for your needs. The office has a wonderful atmosphere and the staff are just as helpful as Dr. Pal. "

    --Mikail
  • "I couldn't ask for a better Optometrist. She is a delight to deal with, very patient, helpful and extremely knowledgeable. She was very good with my kids who can be very fussy at times.. And who could ask for a more beautiful location. Highly Recommend! "

    --Natalie M.
  • "My wife and I, highly recommend Dr. Pal. The staff, the service, the merchandise, are all top notch. They really make you feel welcomed. It has been several years since I have been able to see this well !!! You and your staff are the best !!!! "

    --Steve and Maria L.
  • "We barely go to optometrists so when we do, we should look for the best! I am super pleased I chose Dr. Pal\'s office. They were helpful from beginning to end, from booking on the phone to my actual visit. Dr. Pal was very detailed and went in-depth about my eye health. She is very patient and made me feel calm. The optician helped me pick a great pair of glasses, they were genuinely friendly which is a huge bonus."

    --Ahmad S
  • "I have been going to Dr. Pal for several years now. My most recent visit on June 6, 2016 was the best experience there that I have ever had. Firstly, the women on the desk were friendly and efficient - a very good prelude to my examination. Dr. Pal, herself, was, as usual, very thorough and encouraging in her examination. And she puts you at ease before we get into the eyes examination by discussing other things in life. That helps to ease any stress I may have. And they now have a man in the office who does that difficult examination (name of which I do not know!). He is so patient and encouraging and made the exam not so difficult for me this time. After all that, I saw Dr. Pal again before I left and she told me my eyes were good! Even had the news been not so good, I believe that I would be able to handle it because I truly believe that Dr. Pal and her staff would have taken good care of me. I will always go back to Dr. Pal and members of her team because I truly believe"

    --A. Howlett
  • " I have been to a few appointments at Dr. Pal\'s office over the last year for dry eye issues and every time it has been a very positive experience. The 3 receptionists at the front desk are warm and friendly. They are attentive and provide a very high level of customer service. I appreciate that they call me by name and remembered conversations we had at previous visits. I find Dr. Pal to be an excellent practitioner who is very thorough with her exams, has a lovely personality and takes the time to answer any and all questions that may arise. I am happy with the computer glasses I purchased and value the honest opinions I received from the staff when selecting frames. It was refreshing to have multiple opinions on styles and I felt they truly wanted me to walk out with a frame that was best suited to me. I highly recommend Dr. Pal \'s office! As a health care practitioner myself, I think all health care experiences should be this personilzed and friendly!"

    --A. Mclean
Colour Vision Deficiency



Contents

Colour Vision Deficiency

Most cases of CVD are inherited and the person is affected at birth. Overview People who cannot distinguish between certain colours and shades have a condition called colour vision deficiency (CVD) commonly known as colour blindness. Abnormal colour vision may vary from only a slight difficulty distinguishing among different shades of the same colour to the rare inability to distinguish any colours.

Most cases of CVD are inherited and the person is affected at birth. In some cases however the condition results from retinal or optic nerve diseases the development of cataracts certain medications or aging. Diseases such as multiple sclerosis and diabetes can also cause colour vision disturbances.

In a normally functioning eye there are nerve cells in the retina called rods and cones. Rods detect brightness and cones detect colour. There are three different types of cones each of which is sensitive to red green and blue light. People with CVD have either fewer cones for each colour an absence of cones for at least one colour or cones that do not function properly.

Who is affected by colour vision deficiency?

In the inherited type of CVD roughly 1 in 10 men have some degree of abnormal colour vision. This means that one of the three types of cones in their eyes is either faulty or missing altogether. The condition is hereditary and sex-linked: fathers will pass the gene to their daughters (but not their sons) and mothers can pass it to all their children. However because women can be unaffected carriers men are at least 20 times more likely than women to develop colour vision problems.

People with color deficiencies may have difficulty distinguishing certain colors (e.g. a red/green color deficiency means that reds and greens are more difficult to distinguish). But as this photo demonstrates many other colors are just as distinguishable to a person with a color deficiency as to someone with normal color vision.

Below are the various types of colour deficiency.

Problem Official Term % of Males Per 1000 Males Weak in red "protanomalous" 0.5 % 5 No red "protoanopia" 0.8 % 8 Weak in green "deuteranomalous" 3.3 % 33 No green "deuteranopia" 0.6 % 6


The intensity of colour and the brightness of lights also affect a person’s degree of CVD. For example most people who have a red-green colour deficiency would be able to determine that a bright green crayon is green when outside in the sunlight but might think that it is a brown or red crayon when indoors.

Many people might not even realize that they cannot properly differentiate between colours as they are able to function effectively. For safety reasons people with CVD experience exclusion from many occupations such as airline and military pilots and fire and police workers. Using various colour vision tests your eyecare practitioner can diagnose CVD as well as the type and severity of the condition. The colour of dots that make up the numbers are visible to people of normal colour vision but are confused with adjacent colours by those with CVD.

The Ishihara Test

by Dr. Shinobu

Ishihara is a common screening test for colour deficiency. It determines colour problems by means of a series of cards each having coloured dots that form one pattern to the normal eye and a different pattern to the eye that is colour-deficient.

What numbers do you see revealed in the patterns of dots below? Answers are at the bottom of the article.

Symptoms

In mild cases of CVD a person has trouble distinguishing between shades of a certain colour. In more severe cases a person is unable to see a particular colour at all. Complete colour blindness is very rare. It is important to remember that people with colour deficiency generally can see most colours; they just have trouble distinguishing between some shades of red and green.

Colour vision deficiency can affect a person’s daily activities. For example a person affected with CVD who is cooking meat might be unable to see if the piece of meat was raw or overcooked. Distinguishing between ketchup and chocolate syrup or red and green peppers can be difficult or impossible. People with CVD might not see a woman wearing red lipstick and might only be able to differentiate between a red and a green traffic light by its brightness and positioning.


Treatment

Colour vision deficiency is incurable although people can learn to adapt their lifestyle to their visual condition. In addition wearing tinted eyeglasses or contact lenses might help to distinguish certain colours or to make them appear brighter or dimmer. Electronic devices are available that can identify colours. Known as Electronic Eyes the sensors within the device activate an audio synthesizer that states the name of the colour aloud. Unfortunately the uses of the device are limited as it cannot read text.

Children and Colour Blindness

Early diagnosis of CVD can spare a child from frustration and help reduce stress when doing schoolwork. This is especially true as many materials designed for children rely heavily on colour as a teaching tool. Your eyecare practitioner can counsel you and your child regarding this condition.

Labeling or arranging clothing accessories and other household articles will help a child co-ordinate his or her garments and increase independence. A child can learn the brightness and positioning of traffic lights and the meaning of street signs by their shapes. Inform their teacher that colour-coded school assignments are not suitable and choose books that do not use coloured print on coloured backgrounds. Children’s books specially designed for people with CVD are available.

Did you know?

Colour blind people were used in World War II spy planes to spot camouflaged camps as they naturally looked for outlines more than for colours.

The following numbers are visible in the Ishihara Test by people with normal colour vision:

Left Column Right Column 25 8 29 45 6 56


 
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