Research the causes of related medical symptoms such as: 1  Eye. 2  Eye symptoms (5412 causes) 3  Eye disease. 4  Eye disorder. 5  Eye problem (5412 causes) 6  Eye pain (475 causes) 7  Itch (1068 causes) 8  more symptoms...Â».
How to read the Histogram. A histogram is a graphical representation of the pixels exposed in your image. The left side of the graph represents the blacks or shadows, the right side represents the highlights or bright areas and the middle section is mid-tones (middle or 18% grey).
Depending on the height of the results, the histogram is printed on either a 12% or 24% scale to fit our letter-size report format. The bottom line (horizontal scale) is measured in 1-micron increments (one micron is equivalent to one thousandth of a millimeter or one twenty-five thousandth of an inch). To analyze the micron test report histogram, find the average fiber diameter (AFD), Fiber Diameter in Microns, on the horizontal scale.