The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 2001
Filed:
Nov. 25, 1997
Masanori Amano, Hazu-gun, JP;
Hirokatsu Makino, Toyohashi, JP;
Nidek Co., Ltd., , JP;
Abstract
An apparatus for operating upon a cornea for delivering a laser beam having wavelength in an ultraviolet range emitted from a laser light source to the cornea, and for correcting ametropia by ablating the cornea with the laser beam, the apparatus comprises a correcting-hypermetropia optical system having a first aperture to restrict an ablation area, for correcting hypermetropia by changing a passing area for the laser beam, input device for inputting information necessary for defining a corneal shape after ablation, controlling device for defining an ablation shape based on the information inputted by the input device, and for driving the laser light source and the correcting-hypermetropia optical system, and a second aperture located by decentering for the center of the cornea, for transmitting the laser beam within an area of a near-point portion, whereby correction of presbyopia may be performed so that the cornea has double focal points by driving the laser light source and the correcting-hypermetropia optical system under condition that the second aperture is located at a predetermined position.