admin October 15th, 2007
So I’m wading through my OU lessons with great aplomb and am enjoying learning about the design cycle and, the principles of web design. Today’s lesson however, brought to my attention just how much I took my eye-sight for granted!
I’ve managed to glide through life with the smug knowledge that I have outstanding eye-sight, no really - I have been known for my superhero-esque, x-ray vision and being able to read the smallest of font sizes from a distance of 200 yards! But I had never for a moment, imagined that I would have deficiencies with my S-Cones!
What are these S, M and L-Cones I hear you say? Well, for those of you wondering whether I’m referring to portion sizes for ice-creams, you’d be mistaken - I am in fact referring to the Cones found smack bang in your eye-ball. These cones are receptors to the different ranges of light that beam through your mince-pies, which in turn stimulate the brain cells and give different perceptions to the light received.
Now it would help to know which Cones are more receptive to what colour, so in brief; S is more receptive to blue, while M picks up on green wavelengths and L soaks in all that is red.

A quick course test required me to pick out rows (out of 10) where the variation of colour changed across that row. My score was calculated as follows;
* 6 /10 S-Cones
* 8/10 M-Cones
* 10/10 L-Cones
If you have ‘normal’ colour vision, you will get a score of around 8-9 with 10 being fantastic! On the other hand, if you do not have a cone type you will only reach around 5, showing that you are ‘abnormal’ and not as fantastic as you may have thought.
Here’s the test, please feel free to leave your scores and any comments.
So, what has this taught me to remember when designing web-pages? Well, having 20/20 vision alone, certainly doesn’t account for the way colours are perceived via a monitor. I mean take Monet for instance. By unfortunately developing cataracts, his paintings were greatly affected and where once his colours were vibrant and glorious, instead changed to misty-grey and less exuberant creations.
I guess what I’m trying to say is that, I must become one with the web-safe colour palette and be constantly aware of how text is displayed - ensuring it’s legible. I must also remember that sometimes what I create will not necessarily be perceived as intended by all viewers…