ויהי חשך אפלה בכל ארץ מצרים שלשת ימים
Egypt was plunged into three days of overwhelming darkness, a blackness so heavy that the Egyptians were unable to move. If the purpose of the darkness was to impede the Egyptians’ ability to see, Hashem could have struck them with blindness. It happened in Sodom, when the townspeople were about to attack the Angels who had come to save Lot. Hashem could simply have blinded the Egyptians without creating such a heavy darkness. The Chasam Sofer, zl, explains that it is well-known that when a person loses the power of one of his senses, the other senses become more acute….
