There are two types of photoreceptors, the cones and the rods. The cones function in bright light and there are three types that are maximally sensitive to different colours, which allows the ratio of their responses to code colour.
Medioimages/Photodisc/Photodisc/Getty Images. Most PGA Tour caddies make a salary of between $1,000 and $1,500 a week, plus a percentage of the playerâs winnings each week. A common rate is 5 percent for finishes outside the top 10, 7 percent for non-winning top-10 finishes and 10 percent if the golfer wins.
US PGA Championship 2015: Caddies for Rory McIlroy and Jordan Spieth could earn up to $180,000 in prize money. I'm a sports and sports business journalist with City A.M. Follow me for coverage of the industry behind sports and the money made by top athletes.