Method of measuring optical characteristics of spectacle lenses and lens meter

A lens meter comprising:

• a pair of left and right lens rests capable of point-supporting left and right lenses of a pair of spectacles;
• a pair of frame retaining members capable of holding a spectacle frame of the pair of spectacles whose lenses are supported by the lens rests from front and rear sides;
• lens presser members for pressing the spectacle lenses supported by the lens rests against the lens rests;
• a pair of left and right measurement optical systems for measuring optical characteristics of the spectacle lenses supported by the lens rests on the basis of measurement beams passing around the lens rests;
• and a computation control circuit which controls the measurement optical systems to cause it to execute the measurement and which obtains the optical characteristics of the spectacle lenses on the basis of measurement signals from the measurement optical systems,
• the lens meter further comprising presser member driving means for moving the lens presser members to pressing positions where they press the spectacle lenses against the lens rests and to retracted positions where they are retracted from the pressing positions,
• wherein the computation control circuit controls the measurement optical systems upon movement of the lens presser members to the retracted positions by the presser member driving means so as to cause them to execute measurement of the optical characteristics of the spectacle lenses.