Update your drivers, disable forced AA
Also you have optifine installed?
does pressing escape load the chunks? is fog turned off and render turned to tiny? is your richard made of aspartame? is openGL turned on? Have you updated your drivers recently?
The pictures look as if you are just loading the save. Are these screenshots at least 30 seconds to a minute after loading the save?What GPU and OS do you have?
Do you two not see the obvious triangulation of blocks in the pictures?Go to your optifine settings and turn mipmapping off under quality