A device (2) for an ophthalmological illumination system (1) comprising a light instrument (3) for illuminating the intraocular space of a human or animal eye (33) comprises a housing (4) having a proximal housing end (5), a distal housing end (6), and an opening (7) in the proximal housing end (5). The housing (4) delimits a receptacle space (8), which extends in a manner proceeding from the opening (7) in the proximal housing end (5) along a longitudinal direction (L) in the direction of the distal housing end (6). The receptacle space (8) is configured for receiving the light instrument (3) through the opening (7) in the proximal housing end (5). The housing (4) comprises at least one translucent material at least in the region (10) of the distal housing end (6).