The Color-Sensitive Cones. In 1965 came experimental confirmation of a long expected result - there are three types of color-sensitive cones in the retina of the human eye, corresponding roughly to red, green, and blue sensitive detectors.
Most PGA Tour caddies make between $1000 and $1500 per week, but they also make a percentage of what the player wins in the tournaments. This usually equates to 5 percent of any finish outside the top 10. Players breaking into the top 10, but not winning, will share 7 percent of their prize with their caddies.
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.