Image copyright BMJ Image caption A scan showed the cyst above the woman's eye

A woman has had a contact lens removed from her eyelid 28 years after it was thought to have fallen out.

The discovery was made by doctors in Dundee after the patient, now aged 42, complained of swelling over her eye.

The lens was found lodged in a cyst which had mysteriously flared up after more than a quarter of a century.

The woman had been struck in the eye by a shuttlecock when she was 14, and it had been assumed the lens had been knocked out by the impact.

The unusual case is reported in the medical journal The BMJ.

Researchers at Ninewells hospital carried out an MRI scan after the woman was referred to the Department of Ophthalmology by her GP.

The patient presented with left upper eyelid swelling and ptosis (a droopy eyelid), according to doctors Sirjhun Patel, Lai-Ling Tan, and Helen Murgatroyd .

Images revealed an ovoid-shaped cyst about 8mm long but there was no evidence of anything inside it.

When surgeons removed the lump, the cyst ruptured revealing the lens.

Image copyright BMJ Image caption The contact lens was found lodged inside a cyst that was removed from the woman's eyelid

Dr Patel and colleagues wrote: "On further questioning, the patient's mother recalled that the patient had a history of blunt trauma to the upper left eyelid as a child.

"The patient was hit in the left eye with a shuttlecock while playing badminton at the age of 14.

"The patient was wearing an RGP (Rigid Gas Permeable) contact lens at the time, which was never found.

"It was assumed that the contact lens dislodged out of the eye and was lost."

The paper explains the woman, who is not named, suffered swelling to her eye after the incident but that inflammation was successfully treated by her GP.

The patient had never worn RGP lenses again following the accident.

The researchers said: "We can infer that the RGP lens migrated into the patient's left upper eyelid at the time of trauma and had been in situ for the last 28 years."

The team added: "The migration of a rigid gas permeable (RGP) lens into the eyelid is a rare cause of eyelid swelling.

"Spontaneous migration of a hard contact lens into the eyelid is a relatively known occurrence, but we were only able to find four reported cases of lens migration secondary to significant trauma.

"This case report exhibits the longest time between traumatic RGP lens migration into the eyelid and presentation of eyelid swelling."