Standard Glocks have the three dot system on most of their pistols. Two white dots on the rear sight and one on the front sight. How does this work for you?
Older shooters have a hard time seeing the space between the front post and rear sight bars when aiming at a target. The white dots seem to distort the sight picture if you are one of those individuals blessed with the need for reading glasses.
How have you dealt with this problem? Did you change out the sights, black out the white dots or some other fix?