Method of designing a non-progressive multifocal ophthalmic lens
First Claim
1. A method of designing a non-progressive ophthalmic lens having a distance viewing area and at least one other viewing area, said method comprising:
- forming a first arc segment defining a portion of a substantially spherical far distance viewing area having a prescribed power;
forming a second arc segment defining a portion of a second viewing area having a desired power and a top portion coinciding with said first arc segment for a first distance; and
blending said first and second arc segments together in areas where said segments do not coincide,said lens being characterized by substantially no image jump, no visible line segment at said top portion and no separation through a center region of said top portion.
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Abstract
The present invention relates to a multifocal ophthalmic lens which comprises a first substantially spherical area for distance viewing, a second substantially spherical area for near viewing having a desired width and height and being surrounded on a plurality of sides by the first area, and relatively narrow areas intermediate the first and second areas for blending the second area into the first area. The lens design of the present invention may also include an optional third substantially spherical area adjacent the second area for increasing the near viewing range in a substantially contiguous manner.
74 Citations
6 Claims
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1. A method of designing a non-progressive ophthalmic lens having a distance viewing area and at least one other viewing area, said method comprising:
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forming a first arc segment defining a portion of a substantially spherical far distance viewing area having a prescribed power; forming a second arc segment defining a portion of a second viewing area having a desired power and a top portion coinciding with said first arc segment for a first distance; and blending said first and second arc segments together in areas where said segments do not coincide, said lens being characterized by substantially no image jump, no visible line segment at said top portion and no separation through a center region of said top portion. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification