1. An opthalmological measuring device for determining geometric structures of an eye, comprising an optical, triangulating first measurement system and an optical, interferometric second measurement system, wherein the first measurement system is configured to determine at least one geometric reference in the eye by triangulation, the second measurement system is configured to determine geometric detailed structures in the eye by optical interferometry, and the measuring device is configured to position the geometric detailed structures determined by the second measurement system on the basis of the at least one geometric reference in the eye determined by the first measurement system.