Spectacle lens edge grinding machine

A method for grinding the edge of a spectacle lens with a spectacle lens edge grinding machine, said method comprising the steps of:

• a) measuring at least one actual radius of a predetermined angle at a peripheral point of a spectacle lens, ground to have a spectacle lens contour, relative to an abutment, wherein said actual radius is a radius of a circumferential V-shaped bevel of the spectacle lens and is measured relative to a wedge-shaped groove of the abutment;
• b) inputting the at least one measured actual radius into a computer with a memory;
• c) comparing the at least one measured actual radius with a corresponding nominal radius stored in the memory of the computer to determine a deviation from said nominal radius;
• d) comparing said deviation to a threshold value stored in the memory of the computer;
• and
• e) controlling with said computer an additional grinding step, when said deviation surpasses said threshold value, for correcting the spectacle lens contour in order to compensate for said deviation.

A method for grinding the edge of a spectacle lens with a spectacle lens edge grinding machine, said method comprising the steps of:

• a) measuring the actual radii of the entire spectacle lens contour of a ground spectacle lens relative to an abutment;
• b) inputting the measured actual radii into a computer with a memory;
• c) comparing the measured actual radii with corresponding nominal radii of the entire spectacle lens contour, stored in the computer, to determine the deviations from said nominal radii;
• d) comparing said deviations to a threshold value stored in the memory of the computer;
• e) averaging said deviations, when said threshold value is surpassed;
• and
• f) controlling with said computer an additional grinding step based on said averaged deviations for correcting the spectacle lens contour.

A method for grinding the edge of a spectacle lens with a spectacle lens edge grinding machine, said method comprising the steps of:

• a) measuring the actual radii of the entire spectacle lens contour of a ground spectacle lens relative to an abutment;
• b) inputting the measured actual radii into a computer with a memory;
• c) comparing the measured actual radii with corresponding nominal radii of the entire spectacle lens contour, stored in the computer, to determine the deviations from said nominal radii;
• d) comparing said deviations to a threshold value stored in the memory of the computer;
• and
• e) controlling with said computer an additional grinding step for correcting the spectacle lens contour such that only such areas of the spectacle lens contour are corrected in which the deviations surpass said threshold value.