code/__DEFINES/fov.dm 
BASE_FOV_MASK_X_DIMENSION | Base mask dimensions. They're like a client's view, only change them if you modify the mask to different dimensions. |
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NEARSIGHTNESS_FOV_BLINDNESS | Range at which FOV effects treat nearsightness as blind and play |
NIGHTVISION_FOV_RANGE | Range in tiles that a mob can see in the dark (used to determine if a mob has night_vision) |
FULLSCREEN_OVERLAY_RESOLUTION_X | The fullscreen overlay in tiles for x axis |
FULLSCREEN_OVERLAY_RESOLUTION_Y | The fullscreen overlay in tiles for y axis |
Define Details
BASE_FOV_MASK_X_DIMENSION 
Base mask dimensions. They're like a client's view, only change them if you modify the mask to different dimensions.
FULLSCREEN_OVERLAY_RESOLUTION_X 
The fullscreen overlay in tiles for x axis
FULLSCREEN_OVERLAY_RESOLUTION_Y 
The fullscreen overlay in tiles for y axis
NEARSIGHTNESS_FOV_BLINDNESS 
Range at which FOV effects treat nearsightness as blind and play
NIGHTVISION_FOV_RANGE 
Range in tiles that a mob can see in the dark (used to determine if a mob has night_vision)