A circular gap in the iris near the pupil between the layers of the optic cup (von Szily, 1902). [ http://dx.doi.org/10.1007/BF00413234 http://orcid.org/0000-0002-6601-2165 ]
Synonyms: marginal sinus (v. Szily) marginal sinus of von Szily
This is just here as a test because I lose it