sentences:  Later he studied with ophthalmologist Albrecht von Graefe (1828-1870) in Berlin, then subsequently took an extended scientific trip to London, Edinburgh and Paris.After returning to Germany, he worked with his older brother, Alexander Pagenstecher (1828-1879), at the latter's eye clinic in Wiesbaden.After the untimely death of his brother in 1879, he took charge of the Wiesbaden eye clinic.