And the priest shall see the plague

The Talmud cautions that a priest who is blind in one eye is excluded from examining and pronouncing judgment on plagues. Every plague deserves to be studied with two eyes. One eye sees the leprosy itself, and the other eye sees the extenuating circumstances and reason which led to the sin. A priest who is blind in one eye will see only that which is negative, the plague itself, and will not try to find a merit in that person’s favor. Such a priest is unfit to pass judgment. (Rabbi Yosef Klein)