I got them last year and it took a lot of practice to get sighted in. I have the no line type of glasses and it took some time for me to be able to find the proper focal pointon my lens. I gotuse to wearing them and it comes natural now. Get this...I am now experimenting with bifocal contacts! My glasses always fog up while I hunt, so I wanted to trycontacts.It's going to take about a month but, I'll let you know how my experiment goes.