Rashi on Exodus 19:11/רש"י על שמות י״ט:י״א

1והיו נכנים AND LET THEM BE PREPARED — separated from their wives (Mekhilta; cf. Rashi on Shabbat 87a).

2ליום השלישי AGAINST THE THIRD DAY, which is the sixth of the month. On the fifth Moses built the altar under the mountain and the twelve monuments — the whole narrative as is stated later on in the Sidra ואלה המשפטים (Exodus 24:4), for there is neither “earlier” nor “later” (there is no chronological order) in the Torah (Mekhilta-2).

3לעיני כל העם BEFORE THE EYES (in the sight) OF ALL THE PEOPLE — This tells us that there was not a blind person amongst them — that they had all been healed of their blindness (Mekhilta).