ViewSonic ViewPanel VP180m User Manual page 14

sharpens the focus by aligning the illuminated pixels.
Try Auto Image Adjust first.
NOTE:
adjusts the clarity and focus of the screen image.
adjusts the video input signal to the screen size using
the following options: Fill All, Fill Aspect Ratio, or 1:1.
allows you to choose the language used in the menus
and control screens.
ViewSonic VP180m 13