Poyekhali! Yuri Gagarin & The Dawn of Space Exploration
Specialist Imaging
Aerial and Satellite
Animals
Flowers
Landscapes
Space
Food
History
Graphics and Patterns
DNA 50th Anniversary

Testimonials

An excellent colour photoraph of Donald Campbell with Bluebird K7. If I need to buy any more pictures like that, I will certainly be using Media Storehouse Ltd.
alasdair_gardiner
11th February 2010

English

Colour blindness test

Colour blindness test. Computer artwork of an Ishihara colour test card used to check for red- green colour blindness. The card is comprised of red and orange dots on a background of green dots. A person with normal vision will be able to see an image of an eye. A person with red deficiency (protanopia) will only see the orange parts of the word, while those with green deficiency (deuteranopia) will only see the red parts of the word. Colour blindness is usually caused by an inherited genetic defect in the light-sensitive cells (cones) of the eye. Colour blindness can also be caused by optic injury or nerve diseases.. Stunning Photo Gifts From Science Photo Library