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White Leds Landscape

A2 level question: Do different coloured backgrounds affect acuity, if so what is the biology behind this?

I am doing tests with a landscape A4 sheet of paper with a black line running across the middle, it is then split up by a 6mm gap. I am testing people to see the furthest distance they can tell there is a gap present with different coloured backgrounds. The colours i am using are the rainbow colours; purple, pink, blue, green, yellow, orange, red and i am using white as a control.
Looking forward to answers ASAP
im not so sure if my test is suitable for this question from what has been shared already in this discussion :S:S

Hi

I asked a question about my difficulty on focusssing on blue LEDs and got some good answers

http://uk.answers.yahoo.com/question/index;_ylt=AkYLqC9cVMjgrAutyRr9fdchBgx.;_ylv=3?qid=20071218162638AAaMbB9

An article from IBM was cited in it which may be interesting:

http://www.lawrence-najjar.com/papers/Using_color_effectively.html

___________________________________

Particularly the part on blue light - which may explain probs in acuity particulalry if you manage to get a fluorescent blue printed:

Don't use blue for text
The reason for not using saturated blue for text, thin lines, and high resolution information is simple. The eye is not designed to see it clearly.

The lens absorbs some of the light that is transmitted through it. In fact, the lens absorbs almost twice as much light in the blue region of the color spectrum as in the yellow and red regions (Murch, 1983). This problem increases with age because the lens gradually yellows and filters out the shorter wavelengths of light, such as blue.

______________________________

So there's your paper- If a lens yellows with age, would you observe in your findings a correlation between loss of acuity in the the high blue spectrum and the age of the participants ?

Good luck with your paper, I wish I had the internet in 1988.

Don't know if this is helpful

re whether you think this test is suitable, I think it is as there is the basic data on acuity that you will gather, and you can relate it to the answers/materials discussed in the Yahoo! answers. Rods/cones etc

Additionally (if you want the extra work that it) I think age is a good variable that could be considered as it is a clearly defined variable which you could relate to the yellowing of the lens. But this might be over egging the pud.

Good luck!!!!

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