Contact lens
First Claim
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1. A contact lens, comprising:
- material forming a lens of suitable size to fit a person'"'"'s eye and extend over at least a portion of the sclera of the person'"'"'s eye;
the lens having an optical zone, a peripheral zone and a sagittal depth control zone between the optical zone and the peripheral zone;
the sagittal depth control zone being configured to raise the optical zone above the level of a person'"'"'s eye when the lens is in use and create a tear layer between the optical zone and the person'"'"'s eye; and
tear flow control features in the sagittal depth control zone, the tear flow control features comprising ports that penetrate through the material of the lens, the ports being elongated to form slots, and the slots being oriented to slant nasally as the slots extend radially outward.
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Abstract
A scleral lens has an optical zone, a peripheral zone and a sagittal depth control zone between the optical zone and the peripheral zone. The sagittal depth control zone may be configured to raise the optical zone above the level of a person'"'"'s eye when the scleral lens is in use and create a tear layer between the optical zone and the person'"'"'s eye. Tear flow control features are provided in the sagittal depth control zone.
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Citations
12 Claims
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1. A contact lens, comprising:
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material forming a lens of suitable size to fit a person'"'"'s eye and extend over at least a portion of the sclera of the person'"'"'s eye; the lens having an optical zone, a peripheral zone and a sagittal depth control zone between the optical zone and the peripheral zone; the sagittal depth control zone being configured to raise the optical zone above the level of a person'"'"'s eye when the lens is in use and create a tear layer between the optical zone and the person'"'"'s eye; and tear flow control features in the sagittal depth control zone, the tear flow control features comprising ports that penetrate through the material of the lens, the ports being elongated to form slots, and the slots being oriented to slant nasally as the slots extend radially outward. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A contact lens, comprising:
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material forming a lens of suitable size to fit a person'"'"'s eye and extend over at least a portion of the sclera of the person'"'"'s eye; the lens having an optical zone and at least one zone radially outward from the optical zone; tear flow control features in the at least one zone, the tear flow control features comprising elongated slots forming ports that penetrate through the material of the lens, the elongated slots being oriented to slant nasally as the elongated slots extend radially outward; and a hinge in the lens material, at least a portion of the hinge being located radially outward from the elongated slots. - View Dependent Claims (8)
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9. A method of forming a contact lens for application to a person'"'"'s eye comprising the steps of:
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forming a lens of suitable size to fit a person'"'"'s eye and extend over at least a portion of the sclera of the person'"'"'s eye; providing the lens with an optical zone, a peripheral zone and a sagittal depth control zone between the optical zone and the peripheral zone; the sagittal depth control zone being configured to raise the optical zone above the level of a person'"'"'s eye when the lens is in use and create a tear layer between the optical zone and the person'"'"'s eye; and providing the lens with tear flow control features in the sagittal depth control zone, the tear flow control features being formed as ports that penetrate through the material of the lens, the ports being formed as elongated slots, the slots being oriented to slant nasally as the slots extend radially outward. - View Dependent Claims (10, 11, 12)
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Specification