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.
Some of the most famous golfers in history got their start as caddies, such as Ben Hogan, Sam Snead and Byron Nelson. Few made a full-time living at working for a PGA Tour player. Some events, such as the Masters and Western Open, required players to use their caddies.