...
You would setup your "Lens Filter" like this:
Once you are happy with your selections, click on the 
button.
Next example: Let's keep the same criteria but now just for "Finished" lenses; you would select "Finished" from the "Type" field:
Once you are happy with your selections, click on the button.
Next example: Keep the same criteria but you want to select all the colors between "Brown 3" and "Gray 3":
Once you are happy with your selections, click on the button.
But for any reason you just don't want to keep these selections and you just want to exit out of the "Lens Filter", click on the exit 
button.