Figure 2 of
Larsson, Mol Vis 2004;
Figure 2. Frequency of Pigment Dots
A 5-point scale were used to measure the frequency of pigment dots. The numbered arrows that point towards different pigment dots illustrate the judgement categories of melanin accumulation. For example, melanin accumulations most similar to the pigment dots that have an arrow pointing towards it with the attached number 1, should be judged as category 1. Pigment dots with the attached number 2, should be judged as category 2 etc. Based on standardized rules of how many pigment dot classified for each category, the most appropriate scale step for each subject were determined. Raters judged all melanin accumulations visible on the iris photo.