Having learned about the results of the operation, the woman was very surprised: she had given up contact lenses a long time ago and does not know how it could have gotten into her eye.  The riddle was solved by the patient’s mother, who recalled an incident from her childhood that occurred 28 years ago.  Her 14-year-old daughter was playing badminton at the time.  The shuttlecock hit the girl in the eye, and the lens disappeared.  The parents decided that it had fallen out, but it apparently shifted and got stuck in the eyelid - for 28 years😰.