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Process for preparation of spectacles

  • US 4,762,407 A
  • Filed: 11/29/1984
  • Issued: 08/09/1988
  • Est. Priority Date: 10/02/1984
  • Status: Expired due to Fees
First Claim
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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.

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