How can I awoid flickering edges in playMode

Everytime when I am moving in my game and lokk at edges and other details they do not look smooth and look more like a stop motion movie instead of going from one frame to the next. But when I am trying to take a photo of it it is not visble becuase of the framerate. I know that it is proably confusing to read my queation but if anybody knows what I mean than I would appreciate help.