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.
Former president of the Tour Caddies Association, Michael Carrick, points out that anywhere from five to ten percent of a playerâs winnings at each tournament are paid out to his caddie. When a player finishes in first place, the caddie receives 10 percent of the purse. The perks of the job include travel and extensive seasonal breaks. Sometimes luxurious gifts can be a bonus; after a bet about a palm tree on a course, Bubba Watson purchased a diamond ring for caddie Paul Tesoriâs wife.