visual angle

That means that you sampled about 3-16 square degrees of visual angle in the room, between the door and the chair; whereas your visual field is about 1200 square degrees in total.

The critical central retina subtends an area of visual space of about 1 square degree of visual angle.

It samples the location of the eye 2,000 times per second and has a spatial accuracy down to 0.15 degrees of visual angle.

The words sharp and pungent both originally meant something tactile and visual: something that feels pointy or subtends a small visual angle, but both words can be applied to tastes and smells as well.

It seems almost everything we do now has a visual angle.