An apparatus for monitoring one or more eye parameters of a patient over a plurality of sessions spaced apart in time, wherein the patient's eye can move during the plurality of sessions, comprising: A camera for taking two or more images and an irradiation unit for irradiating the eye with a ring-shaped light pattern to generate a corneal reflection, preferably the center of the ring being coaxial with the optical axis of the camera An irradiation unit, a module for determining a corneal reflection position in an eye image during the first session, an corneal reflection position determined during the first session, and a spherical cornea A module for determining at least one further eye parameter in the first coordinate system and its coordinates based on a geometric model representing the eye as a shaped spherical eyeball A module for determining the corneal reflection position of the eye during a second session spaced in time from the first session, and determining further eye parameters and their coordinates in the second coordinate system based on the corneal reflection position； A module for determining eye movements of 6 degrees of freedom between the first session and the second session, determining a coordinate transformation based on the eye movements of 6 degrees of freedom, and based on the determined eye movements； A module for converting the eye parameters and their coordinates from the first coordinate system to the second coordinate system, further eye parameters and their coordinates measured during the second session, and transformations measured during the first session Quantifying and / or visualizing further eye parameter changes between the first and second sessions based on the measured eye parameters and their coordinates And a module for, apparatus is provided.時間的に間隔を置いた複数のセッションであって、複数のセッションの間に患者の眼が動きうる複数のセッションにわたって、患者の１つ以上の眼パラメータをモニタリングする装置であって、眼の１つ以上の画像を撮影するためのカメラと、角膜反射を生成するためにリング状光パターンによって眼を照射するための照射ユニットであって、好ましくはリングの中心がカメラの光軸と同軸となるように配置さ
