#1ineveryclassroom - - - - -50 shades of muddy green David Featonby - - PowerPoint PPT Presentation

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#1ineveryclassroom - - - - -50 shades of muddy green David Featonby - - PowerPoint PPT Presentation

Jun 26, 2023 246 likes •788 views

#1ineveryclassroom - - - - -50 shades of muddy green David Featonby Science on Stage UK and Eu da.featonby@gmail.com Louise Maule North Tyneside Learning Trust Louise.maule@ntlp.org.uk @LouiseMaule1 Colour is complex ! People use colour

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#1ineveryclassroom

David Featonby Science on Stage UK and Eu da.featonby@gmail.com Louise Maule North Tyneside Learning Trust Louise.maule@ntlp.org.uk @LouiseMaule1

  • - - - -50 shades of muddy green
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Colour is complex !

  • People use colour to recognise objects (is that my coffee cup?) and to

assess material properties (is this banana ripe? Is his skin jaundiced?)

  • The neural processes that underlie colour perception begin in the

retina and continue through multiple areas of cortex. * But what we “see” may be just a little more complex than first thought

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Colour Vision ..not so simple !!

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Colour Vision ..not so simple !!

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Colour vision is a complex phenomenon

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What if your pupils don’t see what you see?

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www.colourblindawareness.org

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Colour Vision Deficiency

  • Inability to distinguish colours, for example red, green, orange, brown.
  • 1 in 12 boys or more, 1 in 200 girls.
  • (Approximately 2.7 million people in the UK)
  • Most are mild to moderate, but 25% are severe.
  • Not currently recognised as special educational need or disability.
  • Not routinely tested for in UK, or in many parts of Europe.
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Different types Different severities External factors can affect colour perception, particularly for those with CVD

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The genes for red / green colour vision are

  • n the x-chromosome.

For a female to be colour blind these genes must be present

  • n both x

chromosomes. A female can be a carrier.

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  • Trichromacy –

‘normal’

  • Protanopia. Red light.

Confuse blacks with

  • reds. Dark browns,

greens, blues, purples.

  • Deuteranopia. Green
  • light. Confusion of

reds and greens, blues and purples.

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  • Trichromacy – ‘normal’ 3 cones

working together

  • Protanopia. Red cone

deficiency.

  • Deuteranopia. Green cone

deficiency

  • Some mothers are tetrachromic

which means they have an additional cone! Extra colour sensitive!

UNDERSTANDING CVD ………….. CONE SENSITIVITY

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  • Trichromacy – ‘normal’ 3 cones

working together

  • Protanopia. Red cone

deficiency.

  • Deuteranopia. Green cone

deficiency

  • Some mothers are tetrachromic

which means they have an additional cone! Extra colour sensitive!

UNDERSTANDING CVD ………….. CONE SENSITIVITY in ANIMALS

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This is what normal vision humans see This is what bulls see. Bulls are colour-blind. They charge the red cape because it is moving, not because it is red.

A red rag to a bull ?

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Additional material

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  • By secondary school, less than 50% of children with mild colour vision

deficiency are aware of it, and 20 – 30% of severe cases are unaware.

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An eccentric uncle , with no sense of colour

  • r…..CVD ?
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Kimberly Steward says her dad’s unique sense of colour comes from the fact that he is colour blind. Kimberly, revealed: 'Well, my dad is colour blind, so he puts extremely bright colours together. The house I grew up in was bright pink. It wasn't normal. The 35-year-old blonde told The Sunday Times Style magazine: 'He doesn't actually recognise the colour situation, so it's not as if he actually knows that he's taking a risk.

http://www.skynews.com.au/culture/showbi z/music/2015/07/29/singer-rod-stewart-is- colour-blind.html#sthash.6mZ1y0B9.dpuf

Rod Stewart

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A novelty….?

but….decisions will be more difficult

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…Or a condition that could limit potential?

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A problem in sport….??

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  • r geography..
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But there can be advantages …. Spot the spider !

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Jamie Oliver* *UK chef Bill Clinton USA President John Dalton Scientist

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Colour blue the balloon with the largest number. Colour green the balloon with the smallest number. Colour yellow the balloon with the number in between.

Is this boy silly? Naughty? Did he not listen or pay attention? Or is it that he just likes red?

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Is the liquid a strong acid, weak acid, or neutral? How easy is the task for normal vision How difficult is this task for someone with CVD?

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The spectrum

What will a CVD pupil see?

Protanopia simulation

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Identification

What will a CVD pupil see?

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Inattentive

‘Silly’ mistakes

Lazy Doesn’t try, and rushes their work Shows frustration Does not take part, or is disruptive Poor, or inappropriate presentation Does not follow instructions Does not listen Does not help to tidy up (into coloured boxes)

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A child with colour vision deficiency may try and hide it. They may not be able to put it into words, and will develop coping strategies. It can also frustrate both the teacher and the child when it appears they can sometimes do a task, and other times not.

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Impact on self esteem

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How mig ight you be in inadvertently making lif life dif ifficult for your colo lour bli lind pupils?

– use a traffic light system for assessment? – place pots of mixed unlabelled coloured pencil crayons on tables? – have coloured labels on library books to indicate different reading levels? – use games e.g. counting games with coloured counters? – use worksheets/software which rely on colour? – use books which highlight familiar sounds using colours? – highlight teaching points in red and green on the white board or in books?

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By the end of the lesson you will be able to:

  • Define key words from the unit
  • Apply the key words when explaining
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Colour coded marking will have less, or no, impact on a colour blind child.

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Normal vision Deuteranopia ?

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What areas of your subject might be affected?

  • Reading litmus paper accurately
  • Undertaking chemical titrations in practical chemistry
  • Identification of metals by the colour of the flame produced when the

metal is burnt

  • Accurately reading stained slides under a microscope
  • Carrying out dissections in biology
  • Identification of species of plants or insects correctly
  • Fully understanding coloured diagrams in textbooks, particularly in

biology, nature

  • Use of prisms in physics.
  • Wiring of plugs in electricity etc
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Electric Wiring UK …. with NORMAL VISION

Pre 1980 Now

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Electric Wiring Deuteranopia

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Electric Wiring Now Normal Deuteranopia

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Displays, animations, and websites can all pose problems for children with colour vision deficiency.

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Top tips

  • Awareness is the most important.
  • Natural light
  • Secondary indicators. e.g. signs on

labels, or underline words

  • Yellow, blue and white
  • Colour buddy
  • Clear boundary between colours
  • Set of labelled pencils
  • Large objects, held apart
  • Contrasts, e.g. red on a white

background but not red and green together on a white background

  • NOT extra time
  • The sight of the pupil is not the

problem

  • Don’t try and do the testing

yourself

  • Don’t make a big deal of it
  • Exam allowance may or may not

be given

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Apps…Programmes

  • iDaltonizer
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  • Try Vischeck on Your Image Files
  • Select the type of colour vision to simulate:
  • Deuteranope (a form of red/green colour deficit)
  • Protanope (another form of red/green colour deficit)
  • Tritanope (a blue/yellow deficit- very rare)
  • Image file:

http://www.vischeck.com/vischeck/visch eckImage.php

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  • CYAN Goggles,

Will eliminate “red” light… not quite the same but it will give you an idea of what someone might see.

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http://www.colourblindawareness.org

@colourblindorg

www.youtube.com/watch?v=l5OYL3Kw8L8

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http://www.colourblindawareness.org

@colourblindorg

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Additional material

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