The ray of light peeking through the crack creates a blinding effect on the subject. The light is so bright that it blinds her vision, covering her eyes in the photo. The black and white filter makes the ray of light even more bright.
People often mistakenly think Audrey Hepburn’s iconic sunglasses in Breakfast at Tiffany’s are Ray-Bans. They are actually by Olivier Goldsmith.Audrey Hepburn as Holly Golightly eating croissant and drinking coffee on the set of Breakfast at "AL"