Progressive optical designs for different add powers
AssigneeShamir Optical Industry Ltd.
InventorsRaanan Moshe Naftalovich, Riki Atias, Alex Shur
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Abstract
Progressive lenses designs are disclosed having optical parameters such as the width of a far vision zone, the width of a near vision zone, the width of a corridor, the maximum residual cylinder, the maximum gradient of residual cylinder, that vary with addition. Such lens designs may provide improved performance for individuals requiring different amounts of addition (such as individuals having different ages) who spend more time performing different types of activities such as viewing hand-held devices like smart phones and tablets or reading books.
Claims22
A method of producing a progressive ophthalmic lens having a far vision zone, a near vision zone and a corridor connecting the near and far optical zones, said method comprising:
- receiving a prescription including an optical add power for an individual;
- and
- selecting at least one optical design parameter of a surface of the progressive ophthalmic lens based on add power,
- wherein the at least one optical design parameter comprises at least one of a normalized width of the far vision zone, a normalized width of the near vision zone, a normalized width of the corridor, a normalized maximum cylinder power per add power in the near vision zone, or a maximum gradient of residual cylinder power per add power in the near vision zone.
A lens kit comprising:
- at least two lenses belonging to a single lens design, each of the at least two lens comprising:
- a far vision zone;
- a near vision zone configured to provide an add power;
- and
- a corridor connecting the far vision zone and the near vision zone
- wherein the at least two lenses provide different add powers, and
- wherein a normalized width of the corridor changes with the add power, wherein the normalized corridor width corresponds to the minimum width of the corridor between cylinder isolines corresponding to 25% of the optical add power.
-49. (canceled)
A method of producing a progressive ophthalmic lens having a far vision zone, a near vision zone and a corridor connecting the near and far optical zones, said method comprising:
- receiving a prescription including an optical add power for an individual;
- and
- selecting a normalized power width of the near zone based on the optical add power, the normalized power width of the near zone corresponding to a horizontal width of the near vision zone between add power isolines at 75% of the optical add power.
-102. (canceled)
Dependencies are inferred from the claim text.