1)
What is the significance of "leEinei Kol ha'Am"?
1.
Rashi: It teaches us that there was not a blind person among them. 1
2.
Ramban: It teaches us that every single person witnessed how Hashem descended on Har Sinai in an apparition of fire. 2
1
Because following their acceptance of the Torah, they were all cured.
2
Ramban: Since the Torah states, "Lo Yir'ani ha'Adam va'Chai" (Shemos 33:20).
