- A dictionary of medical eponyms

Bonnet's syndrome (Charles Bonnet)

Related people

Visual hallucinations in psychologically normal elderly people.

Charles Bonnet in 1760 described vivid, complex visual hallucinations in his psychologically normal 87 year old grandfather, who had cataract operations on both eyes and was practically blind. His grandfather saw pictures of men, women, birds, carriages, buildings, tapestries and scaffolding patterns.

Most affected persons are elderly and psychologically normal, but visually impaired. However, the phenomenon is not exclusively restricted to people with visual impairment.


  • C. Bonnet:
    Essai analytique sur les facultés de l'âme.
    2nd edition. Copenhagen 1769; volume 2: 176-178.
    First edition, Copenhagen, 1760.

What is an eponym?

An eponym is a word derived from the name of a person, whether real or fictional. A medical eponym is thus any word related to medicine, whose name is derived from a person.

What is Whonamedit?

Whonamedit.com is a biographical dictionary of medical eponyms. It is our ambition to present a complete survey of all medical phenomena named for a person, with a biography of that person.


Whonamedit? does not give medical advice.
This survey of medical eponyms and the persons behind them is meant as a general interest site only. No information found here must under any circumstances be used for medical purposes, diagnostically, therapeutically or otherwise. If you, or anybody close to you, is affected, or believe to be affected, by any condition mentioned here: see a doctor.