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by Adam Hart-davis/science Photo Library
$41.95
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Fletcher-hamblin Colour Vision Test Card. iPhone case by Adam Hart-davis/science Photo Library. Protect your iPhone with an impact-resistant, slim-profile, hard-shell case. The image is printed directly onto the case and wrapped around the edges for a beautiful presentation. Simply snap the case onto your iPhone for instant protection and direct access to all of the phone's features!
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Colour blindness chart. Fletcher-Hamblin colour vision test card. The card consists of five coloured dots arranged in a cross. Subjects are asked to... more
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Protect your with an impact-resistant, slim-profile, hard-shell case. The image is printed directly onto the case and wrapped around the edges for a beautiful presentation. Simply snap the case onto your for instant protection and direct access to all of the phone's features!
Colour blindness chart. Fletcher-Hamblin colour vision test card. The card consists of five coloured dots arranged in a cross. Subjects are asked to identify which of the four outer dots has the most similar colour to the central dot. One of the outer dots is the correct answer. Another dot is deliberately disimilar and is used as a control to make sure the subject has understood the instructions. The choice of either of the other two by the subject would indicate a colour vision defect. This card is one of ten different colour combinations used in the Fletcher-Hamblin test. Colour blindness is a condition which causes confusion between red, green and yellow colours.
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$41.95
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