Orthokeratology and bi-focal contact lens
First Claim
1. An orthokeratology contact lens for a patient'"'"'s cornea, comprising:
- an optical zone (20) having a curvature defined by a base curve (30);
a plateau zone (22) coupled to said optical zone and extending radially therefrom, said plateau zone having a curvature defined by a plateau curve (34), said plateau curve being flatter than said base curve (30);
a fitting zone (24) coupled to said plateau zone and extending radially therefrom, said fitting zone having a curvature defined by a fitting curve (36), said fitting curve being steeper than said plateau curve;
an alignment zone (26) coupled to said fitting zone and extending radially therefrom, said alignment zone having a curvature defined by an alignment curve (38), said alignment curve being flatter than said fitting curve;
a peripheral zone (28) coupled to said alignment zone and extending radially therefrom, said peripheral zone having a curvature defined by a peripheral curve (42), said peripheral zone forming an edge lift to act as tear reservoir.
1 Assignment
0 Petitions
Accused Products
Abstract
A contact lens is fitted to a cornea of a patient'"'"'s eye to gradually alter the patient'"'"'s cornea during continued wear to reshape the cornea to reduce the hyperopia and/or presbyopia condition. The contact lens has a plurality of zones that includes one or two optical zones, a plateau zone, a fitting zone, an alignment zone and a peripheral zone. The one or more optical zones are utilized to redistribute cornea tissue to cause the cornea to have a steepened central portion surrounded by a flat mid-peripheral ring The plateau zone helps steepening the central cornea by two ways: a positive molding effect of pushing the cornea tissue inward to pile up and a negative molding effect to flatten the mid-peripheral cornea for enhancing.
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Citations
22 Claims
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1. An orthokeratology contact lens for a patient'"'"'s cornea, comprising:
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an optical zone (20) having a curvature defined by a base curve (30);
a plateau zone (22) coupled to said optical zone and extending radially therefrom, said plateau zone having a curvature defined by a plateau curve (34), said plateau curve being flatter than said base curve (30);
a fitting zone (24) coupled to said plateau zone and extending radially therefrom, said fitting zone having a curvature defined by a fitting curve (36), said fitting curve being steeper than said plateau curve;
an alignment zone (26) coupled to said fitting zone and extending radially therefrom, said alignment zone having a curvature defined by an alignment curve (38), said alignment curve being flatter than said fitting curve;
a peripheral zone (28) coupled to said alignment zone and extending radially therefrom, said peripheral zone having a curvature defined by a peripheral curve (42), said peripheral zone forming an edge lift to act as tear reservoir. - View Dependent Claims (4, 5, 6)
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2. An orthokeratology contact lens for a patient'"'"'s cornea, comprising:
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an optical-plateau zone having a positive e-value to form an aspherical curve which is continuously flatter from its central to its peripheral portions, wherein the aspherical curvature flattens to one of less positive in power, zero in power and minus in power;
a fitting zone (24) coupled to said plateau zone and extending radially therefrom, said fitting zone having a curvature defined by a fitting curve (36), said fitting curve being steeper than an outmost portion of said aspherical curve;
an alignment zone (26) coupled to said fitting zone and extending radially therefrom, said alignment zone having a curvature defined by an alignment curve (38), said alignment curve being flatter than said fitting curve;
a peripheral zone (28) coupled to said alignment zone and extending radially therefrom, said peripheral zone having a curvature defined by a peripheral curve (42), said peripheral curve being flatter than said plateau curve (22) by 0-15 diopters, said peripheral zone forming an edge lift to act as tear reservoir. - View Dependent Claims (3)
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7. An orthokeratology contact lens for a patient'"'"'s cornea, comprising:
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an optical zone, comprising an inner optical zone (20a) and an outer optical zone (21a), said inner optical zone having a curvature defined by an inner curve (30a), said outer optical zone having a curvature defined by an outer curve (31a), said inner curve being steeper than said outer curve;
a fitting zone (24) coupled to said outer optical zone and extending radially therefrom, said fitting zone having a curvature defined by a fitting curve (36), said fitting curve being steeper than said outer curve;
an alignment zone (26) coupled to said fitting zone and extending radially therefrom, said alignment zone having a curvature defined by an alignment curve (38), said alignment curve being flatter than said fitting curve;
a peripheral zone (28) coupled to said alignment zone and extending radially therefrom, said peripheral zone having a curvature defined by a peripheral curve (42), said peripheral zone forming an edge lift to act as tear reservoir. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A contact lens for a patient'"'"'s cornea, comprising:
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an inner optical zone (20b) having a curvature defined by an inner curve (30b);
an outer optical-plateau zone having a positive e-value to form an aspherical curve which is continuously flatter from a junction with said inner optical zone to its peripheral portions;
a fitting zone (24) coupled to said plateau zone and extending radially therefrom, said fitting zone having a curvature defined by a fitting curve (36), said fitting curve being steeper than an outmost portion of said aspherical curve;
an alignment zone (26) coupled to said fitting zone and extending radially therefrom, said alignment zone having a curvature defined by an alignment curve (38), said alignment curve being flatter than said fitting curve;
a peripheral zone (28) coupled to said alignment zone and extending radially therefrom, said peripheral zone having a curvature defined by a peripheral curve (42), said peripheral zone forming an edge lift to act as tear reservoir. - View Dependent Claims (17)
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18. A contact lens for a patient'"'"'s cornea, comprising:
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an optical zone, comprising an inner optical zone (20b) and an outer optical zone (21b), said inner optical zone having a curvature defined by an inner curve (30b), said outer optical zone having a curvature defined by an outer curve (31b), said inner curve being steeper than said outer curve;
a plateau zone (22) coupled to said outer optical zone and extending radially therefrom, said plateau zone having a curvature defined by a plateau curve (34), said plateau curve being flatter than said inner curve and said outer curve;
a fitting zone (24) coupled to said plateau zone and extending radially therefrom, said fitting zone having a curvature defined by a fitting curve (36), said fitting curve being steeper than said plateau curve;
an alignment zone (26) coupled to said fitting zone and extending radially therefrom, said alignment zone having a curvature defined by an alignment curve (38), said alignment curve being flatter than said fitting curve, said alignment curve being steeper than said plateau curve;
a peripheral zone (28), coupled to said alignment zone and extending radially therefrom, said peripheral zone having a curvature defined by a peripheral curve (42), forming an edge lift as tear reservoir. - View Dependent Claims (19, 20, 21, 22)
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Specification