Ophthalmic instrument having a cross cylinder lens
Patent 4436390 Issued on March 13, 1984. Estimated Expiration Date: 
February 11, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 11, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3498699 3698799 3860330 InventorAssigneeApplicationNo. 06/347898 filed on 02/11/1982US Classes:351/234, Mounted on rotatable disc351/235Having plural disc carrierExaminersPrimary: Corbin, John K.Assistant: Bovernick, Rodney B. Attorney, Agent or FirmInternational ClassesA61B 3/028 (20060101)A61B 3/036 (20060101) A61B 3/02 (20060101) Foreign Application Priority Data1981-02-16 JPAbstractAn ophthalmic instrument having a cylindrical test lens and a cross cylinder lens which are adapted to be placed in an examining optical path. The cross cylinder lens is mounted on a lens tube which is rotatably mounted on a swingable lever about a pivot axis. A gear train is provided between the lens tube for the cross cylinder lens and a rotatable part for rotating the cylindrical test lens so that the cylinder axis of the cylindrical lens be rotated about the optical axis of the examining optical path by rotating the lens tube. | |
