Median Thresholds and 95% Confidence Interval

Unit

Median

95%

Confidence Interval (Lower)

95%

Confidence Interval

(Upper)

Median of 18 Resolution

Thresholds

Line-Widths per Head Height*

47.7

45.7

59.2

Median of 18 Dynamic Range (HL) Thresholds

Merged Gray Steps

4.7

4.2

5.5

Median of 9 Dynamic Range (SD) Thresholds

Recognizable Gray Steps

15.0

12.6

17.3

Median of 6 Lens Distortion Thresholds

%

24.4

24.4

24.4

Median of 6 Shutter Speed

Thresholds

Milliseconds

33.3

33.3

36.7