We can assess every eye and put them on a scale from 1-10. If we see no genetic weakness in the organs, we call it a one. An eye that has mostly weakness, we call it 10. These are the predispositions we are born with. Some people, by virtue of their genetic strength, can go on through their lives with vertually no symptoms of illness. A weaker person may not be so lucky.
By analogy, the strong eye is likened to silk, where the weak eye is like a wool or a net. One has holes and the other does not. A close examination of the iris by an Iridologist reveals the relative strength of a given person.
Depending on where these marks occur, results in a weakened state for the coresponding organ in that area of the chart. For example, a genetic "hole" in the south possition of the iris related to kidney. Each person is assessed an an individual, taking into account the impact of each marking in their genetic structure.
When trying to extrapolate why a person is sick, the information revealed via Iridology presents the underlying. It is therefore invaluable when a case of illness arrises mysteriously, as is often the case while viewing through the lense of alopathic medicine. Knowledge of the bady's inherent weakness is a great advantage when working to heal the body, not just from symptoms, but from the organic malfunction.