| 摘要 |
An alignment guidance system comprises a concave mirror (50) and a target source (52) in a plane containing the center of curvature of the concave mirror (50) to present an alignment image to a patient for guiding self-alignment of an ophthalmic instrument, such as a non-contact tonometer, relative to an eye of the patient. An infrared light source (60) at the focal point of the concave mirror (50) irradiates the concave mirror (50) so that a collimated beam is reflected along a measurement axis (20) of the instrument and focused by an objective lens (26). <IMAGE> |
