I have shot a horton scope on a crossbow before with all the extra lines on the scope like that one. I believe that they either call them windage or walking markers. Well, it just makes the scope too busy for me. I like a clean view when getting down to picking the hair I want my hunting head to cut, not a cluttered scope.

That is just my opinion, I know some others like all those lines, but different strokes for differrent folks.