The narrator knew that the girl wore slipper from the sound that he heard as the slippers slapped against her heels.

The sound of the girl’s slippers slapping against her Heels was the only thing about the girl that drew the narrator’s attention.

The only thing that the narrator could make out about his first co passenger was that she wore slippers.

The eyes of the narrator in ‘The Eyes Have It’  were sensitive only to light and darkness. 

The narrator was unable to tell anything about the girl’s appearance as he was completely blind.