| 摘要 |
FIELD: medicine.SUBSTANCE: invention relates to medicine. apparatus for monitoring one or more parameters of patient eye over two sessions which are temporally spaced apart and between which patient eye can move comprises: camera for taking one or more images of the eye; illumination unit for illuminating eye by ring-shaped light pattern to generate corneal reflections, illumination unit being preferably located such that the ring center is coaxial with the camera optical axis; module for determining during first session the location of corneal reflections in the eye image; module for determining during said first session based on said determined location of corneal reflections, at least one further parameter of the eye and its coordinates in first coordinate system based on geometrical model, representing the eye as spherical eyeball having spherically shaped cornea mounted thereon; module for determining during second session location of said corneal reflections of the eye and based thereon further eye parameter and its coordinates in second coordinate system; module for determining eye motion in six degrees of freedom between sessions and for determining coordinate transformation based thereon; module for transforming based on determined eye motion of further eye parameter and its coordinates from said first coordinate system into said second coordinate system; module for quantifying and/or visualizing the change of said further eye parameter between sessions based on said further parameter and its coordinates measured during said second session, and said transformed parameter and its coordinates measured during said first session. Wherein one further eye parameter comprises depth of cornea anterior chamber which is determined based on determining radius of limbus Rl and assuming, it to be circle of latitude on the best fit cornea sphere with radius Rc which is determined based on corneal light reflections such, that corneal chamber depth CD is derived by formula: CD = Rc-sqrt (Rc2-Rl2), where sqrt-square root.EFFECT: using the given invention enables higher accuracy of detecting errors when measuring.14 cl, 15 dwg |
