Step 1.) Extract the "TME Shaders v2.1....zip" file into the shaderpacks folder.
Step 2.) Go into the newly created folder named "shaders".
Step 3.) Open the file "final.fsh" in any word editor like Notepad.
Step 4.) A couple of lines down there should be a line that reads "#define DIRTY_LENS //create dirty lens on screen". Find it.
Step 5.) Change the line "#define DIRTY_LENS //create dirty lens on screen" to "//#define DIRTY_LENS //create dirty lens on screen". Simply just put two foward slashes ( / <--these things) at the start of that line.
Step 6.) Save the file.
Step 7.) Go back out to the "shaderpacks" folder.
Step 8.) Create a new folder an name it whatever you want (like "TME Shaders no dirty lens").
Step 9.) Drag the "shaders" folder into the file you just created.
Step 10.) Select the file you just created in the Minecraft Shaders Option (in-game).
Step 11.) Enjoy!
Hope that helps! Have a nice day!