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Transcript of Colour Deficiency
Eyes have three layers:
A membrane lined with photoreceptors that collects converging light and turns it into electrochemical signals to send through the optic nerve to the brain.
Small area at the center of the Retina that provides central vision.
The Retina surrounding the Macula controls peripheral vision.
The central point of the Macula.
The centre of the Fovia which has a high concentration of cone photoreceptors, but no rods.
are cells used to detect light.
There are two types of photoreceptors
in the retina that are used for sight.
These cells are known as
Both are needed for sight, but Cones are needed to see colour.
If Cones are damaged or deficient the result will be Colour Blindness or Defieciency.
The inside of the
Synapsis (two homologous chromosomes) and Receptors
Rods and Cones
X chromosomes are responsible for producing photopigments which are then used in Rods and Cones.
Most colour deficiencies are caused by the female X chromosome.
This makes colour deficiency a sex (X) linked dominant disease as it relies on X chromosomes to continue.
Colour Deficiency is a result of defective recessive genes being unable to produce these photopigments.
There is a
chance of becoming a carrier or colour deficient when your mother is a carrier.
Mom and Dad
7% of the world`s male population is colour deficient in some way.
While less than 1% of women show any signs of deficiency.
This is because if a woman receives a faulty X chromosome she has another X chromosome to help her. Since men have X and Y chromosomes they will have to use the X chromosome they have, deficient or not.
Colour Deficiencies are found world wide, but are most commonly found in Caucasians.
And around every 13 people out 1000 are born with a colour deficiency.
The four main ways to categorize colour deficiencies are as follows:
* Sensitive to light
* Sensitive to light
People are diagnosed, usually in their early childhood, with dot tests.
There are also tests for children who are not old enough to discern between numbers.
The inability to discern certain colours.
(Though is has been traced to other chromosomes as well.)