Process for preparation of spectacles
First Claim
1. Process for the construction of spectacles from two lenses and a frame which comprises a bridge including at least one pad having a reposing surface, two flanges and two temples, said process comprising the steps of:
- establishing a spatial coordinate system;
using an optical means which observes the wearer'"'"'s face from the front to determine the coordinates in said system of the centers of the wearer'"'"'s eyes as reference points;
specifying an initial target position in said coordinate system which said lenses are intended to occupy relative to the face of the wearer;
using said optical means to determine the coordinates in said system of at least one point on the surface of the wearer'"'"'s nose;
subsequently determining a final target position which said lenses are intended to occupy in said spatial coordinate system and relative to sid reference points and said point on thwearer'"'"'s nose;
correcting, if necessary, the dioptric effects of the lenses to be in accord with the final target position;
using said optical means to determine, relative to said final target position, the coordinates of a point on said reposing surface intended for contact with the wearer'"'"'s nose; and
joining the spectacle lenses, said bridge and the remaining components of the frame in such a manner that the lenses occupy said final target position when the point on said reposing surface of said pad contacts the wearer'"'"'s nose.
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Accused Products
Abstract
The process in accordance with the present invention is especially well-suited for the preparation of spectacles with a correction effect which are adapted both optically and mechanically, whereby the mechanical adaptation is objectified to at least a considerable degree and the mechanical adaptation depends to a lesser extent or not at all on subjective evaluations of the fits of the spectacles on the part of the fitter or the spectacle wearer. For each nose piece of the spectacles the location of at least one nose point on or near the contact surface at which the bridge reposing surface touches the nose, is measured in space relative to two reference points, for example, the eye centers. From this nose point measurement the location of the pad nose piece reposing surface which the latter is to occupy in space on the completed spectacles is determined, which occurs, for example, under the assumption of pressureless contact between the contact surface and the reposing surface. Corresponding to this determination the nose piece of the spectacles are physically shaped, specifically in their correct relative position with respect to the lenses since a target position has been predetermined for the lenses with respect to two reference points in space.
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Citations
31 Claims
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1. Process for the construction of spectacles from two lenses and a frame which comprises a bridge including at least one pad having a reposing surface, two flanges and two temples, said process comprising the steps of:
- establishing a spatial coordinate system;
using an optical means which observes the wearer'"'"'s face from the front to determine the coordinates in said system of the centers of the wearer'"'"'s eyes as reference points;
specifying an initial target position in said coordinate system which said lenses are intended to occupy relative to the face of the wearer;
using said optical means to determine the coordinates in said system of at least one point on the surface of the wearer'"'"'s nose;
subsequently determining a final target position which said lenses are intended to occupy in said spatial coordinate system and relative to sid reference points and said point on thwearer'"'"'s nose;
correcting, if necessary, the dioptric effects of the lenses to be in accord with the final target position;
using said optical means to determine, relative to said final target position, the coordinates of a point on said reposing surface intended for contact with the wearer'"'"'s nose; and
joining the spectacle lenses, said bridge and the remaining components of the frame in such a manner that the lenses occupy said final target position when the point on said reposing surface of said pad contacts the wearer'"'"'s nose. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
- establishing a spatial coordinate system;
Specification