APPARATUS FOR DETERMINING AMETROPIA OF AN EYE

摘要

An apparatus for determining ametropia of an eye includes an optical assembly with a light source, a detector, a plurality of optical elements and at least one stray light stop and a controller. An illumination beam path is provided between the light source and an optical interface in order to allow illumination light generated by the light source to emerge from the optical interface. A measurement beam path is provided between the optical interface and the detector in order to supply measurement light entering through the optical interface to the detector. The measurement beam path passes through an aperture of the at least one stray light stop. A diameter of this aperture is variable or a position of this aperture along the measurement beam path is variable in order to reduce stray light at the detector.

主权项

1. Apparatus for determining ametropia of an eye, the apparatus comprising:
an optical assembly including a light source, a detector, a plurality of optical elements and at least one stray light stop having an aperture; said light source being configured to generate illumination light; an optical interface; a controller; said optical assembly being configured such that an illumination beam path is provided between said light source and said optical interface in order to allow said illumination light generated by said light source to emerge from said optical interface; said optical assembly being further configured such that a measurement beam path is provided between said optical interface and said detector in order to supply measurement light entering through said optical interface to said detector; said measurement beam path passing through said aperture of the at least one stray light stop; said aperture of the at least one stray light stop having a variable diameter; a first actuator; said controller being configured to control said first actuator so as to change the diameter of the aperture.