Ophthalmological laser system and operating method

摘要

A polarization beam splitter selectively decouples detection light onto a detector such that it has a polarization direction that differs from the emitted illumination light. This enables the detection of the light scattered back in the eye lens at a high level of accuracy, since stray light from reflections at optical components of the light path is suppressed. In the generating of photo disruptions or other incisions, the ray exposure of the retina may be reduced in that the incisions being furthest away from the laser are induced first such that laminar gas inclusions with an existence duration time of at least 5 seconds result. In this manner the laser radiation propagated in the direction of the retina in further incisions are scattered and partially reflected such that the influence impinging upon the retina is reduced.

主权项

1. An ophthalmological laser system, for the diagnosis of an eye, a lens of the eye and/or therapy of presbyopia, the ophthalmological laser system comprising:
a laser emitting detection radiation, the radiation being selected to pass through a cornea and aqueous humor of the eye and being focusable in an examination region including the lens of the eye as illumination light via a beam path; the beam path, comprising a beam splitter, a scanner unit, and focusing optics structured to focus the detection radiation in the examination region; wherein returning detection radiation, which returns to the beam splitter from a direction of the examination region, reaches a detector as detection light through a confocal aperture diaphragm; wherein the beam splitter is a polarization beam splitter, which decouples the detection light selectively onto the detector such that the detection light exhibits a polarization direction different from the illumination light; and a control unit programmed to control the scanner unit such that each two consecutive scan points of a continuous scan curve or structure differ from each other in all three spatial coordinates and to determine at least one of form, structure and position of an ocular structure based on the detection light returned from the scan points; wherein the continuous scan curve or structure comprises a Lissajous pattern shape; and further wherein the control unit is further programmed to control the scanner unit such that the Lissajous pattern shape comprises two harmonics and wherein the two harmonics have different frequencies including a first frequency and a second frequency.