1) We display text using a large font to ease eye strain. - Fonts can't "damage" eyes. 2) I accidentally dropped my phone, damaging the screen. - Don't say "and", it is not a separate event. 3) Listening at high volume for long periods can damage hearing.

1) We write in large letters to prevent eye strain. 2) I dropped my phone by mistake and damaged the screen. 3) (Does not need corrections)