fiber optic pin sights on new bow..few questions

ok so i picked up my new bow today, and it came with the sight that has 3 fiberoptic pins on it. they are from top to bottom..What are they for? I remember on my old bow(iron sights) that when I sighted it in, it was sighted for different yards. Like the top pin would be for 15 yards, the second was 20 yards and the last was 25 yards. Is this the same way?

Ive been out of this way to long

 

what kind of sight? the pins work in the same way, top pin would be for 20 yards, so on and so forth...hope that helps.

 

canuck is right about the pins. Something else, depending on the speeds you are getting out of your bow, 3 pins is too much clutter for me. Go down to two if you can. I'm shooting flat out to almost 35 yards so I only use 1 pin. Less pins in your vision while aiming.

 

thats what Ill probably wind up doing..I dont plan on shooting any more then 20 yrds anyway..

It has Montanna Black Gold Fiber optic sights