- Visibility Distance
Distance between you and your visible horizon.
- Viewing Distance
Distance you are viewing the photo.
- Visual Acuity
Clearness of vision, which is dependent on the sharpness of the retinal focus within the eye and the sensitivity of the interpretative faculty of the brain. 20/20 vision is 6/6 vision. At 20 feet or 6 meters, a human eye with nominal performance is able to separate lines that are one arc minute apart (equivalent to lines that are spaced 1.75 mm apart). Learn more on Wikipedia.
- Vertical Angle of View
Angle of view measured vertically (from the top to bottom of the frame).
- Vertical Field of View
Field of view measured vertically (from the top to bottom of the frame).