Patent ID: 6972837
Filing Date: 2005-12-06
Classification: G01M

Abstract:
1. A lens meter for measuring optical characteristics of a lens comprising: a lens rest having an aperture of a predetermined diameter, for supporting a lens to be measured at a predetermined position thereon; a measurement optical system having a light source which projects a measurement light bundle onto the lens supported on the lens rest, an optical member which forms the measurement light bundle to be projected onto the lens into a parallel light bundle, a target plate which limits the measurement light bundle having passed through the lens and the aperture and on which numerous measurement targets are disposed, and a two-dimensional image-sensor which detects the measurement light bundle having passed through the target plate; a controller that: a display that displays, based on the obtained refractive power distribution, a first indicator which indicates a movement direction of the lens on the lens rest so that the near viewing section falls within the region, and a second indicator which informs an operator that the near viewing section falls within the region.