- A dictionary of medical eponyms

Snellen fraction

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The Snellen fraction is a ratio, for instance 20/20 or 20/100 (metric equivalent 6/6, 6/30), measuring the acuity of a person's eyesight compared to a standard observer with good normal acuity. 20/20 means he can resolve 2 target features at 20 feet.

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.