Patent Number: 7,708,409

Title: Controlling beam intensity in ophthalmic illumination systems using serial rotatable shapes

Abstract: An ophthalmic illumination system includes planar shapes serially positioned in a path for a collimated beam, along an optical axis. The shapes are rotationally symmetric with one another relative to the optical axis. Each shape has a central rotational axis intersecting the optical axis. Generally wedge-shaped segments of the shapes are spaced apart around and converge at the optical axis to provide generally wedge-shaped apertures to the beam between the segments. The shapes are rotatable on the rotational axes along the optical axis to assume a plurality of configurations to vary intensity of the beam. The beam can fill spatial modes at substantially all radii of the optical fiber entrance pupil.

Inventors: Lee; Robin Michael (Linton, GB)

Assignee: Bausch & Lomb Incorporated

International Classification: A61B 3/10 (20060101)

Expiration Date: 5/04/12018