System for optical coherence tomography, comprising a zoomable kepler system

An optical system for examining an eye, wherein the optical system comprises:

• an OCT system configured to produce a measurement beam which is incident on the eye;
• wherein the OCT system comprises an objective and a variable optical assembly, wherein the variable optical assembly is disposed upstream of the objective when seen relative to a light path of the measurement beam directed toward the object;
• wherein the variable optical assembly has a first optical component having an optically effective entry surface, through which the measurement beam, in the light path directed toward the object, enters into the variable optical assembly and wherein the first optical component further comprises a focal plane of a principal plane of an object-side beam output of the first optical component;
• wherein the variable optical assembly has a second optical component comprising an optically effective exit surface of the variable optical component, through which the measurement beam, in the light path directed toward the object, leaves the variable optical component;
• wherein the variable optical assembly is configurable into a first configuration in a controllable manner, in which a focal plane position of the first optical component is situated within the variable optical assembly;
• wherein the variable optical assembly is configurable into a second configuration in a controllable manner, in which the focal plane position of the first optical component is situated outside of the variable optical assembly;
• and
• wherein the variable optical assembly is re-configurable between the first configuration and the second configuration by displacing at least one movable optical unit along the light path directed toward the object.