sentences:  In 1878 the archives split into two independent entities; as the "Archives of Ophthalmology" ("Archiv für Augenheilkunde") and the "Journal of Otology" ("Zeitschrift für Ohrenheilkunde").His name is lent to the eponymous "Knapp streaks"; also known as angioid streaks, which are tiny breaks in the elastin-filled tissue in the back of the eye.He devised his own version of an ophthalmotrope, a device used in physiological optics to demonstrate the action of ocular muscles individually or in various combinations.