Method and apparatus for aligning a mask with the visual axis of an eye
First Claim
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1. An apparatus for aligning a mask with a visual axis of an eye of a patient, the apparatus comprising:
- a first target positioned on an instrument axis at a first distance relative to a first location;
a second target positioned on the instrument axis at a second distance relative to the first location; and
a marker configured to indicate the location of the instrument axis;
wherein the mask comprises an aperture having a mask axis that can be positioned substantially collinear with the instrument axis, further wherein the mask comprises an annulus configured to be substantially opaque to visible light and to extend between the aperture and an outer periphery of the mask, the annulus having an inner peripheral region between a central region and the aperture and an outer peripheral region between the central region and the outer periphery of the mask, the inner peripheral, central and outer peripheral regions each having a nutrient transport structure for conveying nutrients between anterior and posterior surfaces of the mask, the nutrient transport structure providing an amount of open area per unit area in the central region that is greater than an amount of open area per unit area in at least one of the outer peripheral region and the inner peripheral region.
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Abstract
An apparatus is provided for aligning an implant with a visual axis of an eye of a patient. The apparatus has an instrument with an instrument axis and an aperture through which the patient may look along the instrument axis. The implant includes an aperture having an implant axis that can be positioned substantially collinear with the instrument axis. The implant further includes a substantially opaque annulus extending between the aperture and an outer periphery of the implant. The annulus has a nutrient transport structure for conveying nutrients between anterior and posterior surfaces of the implant.
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Citations
18 Claims
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1. An apparatus for aligning a mask with a visual axis of an eye of a patient, the apparatus comprising:
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a first target positioned on an instrument axis at a first distance relative to a first location; a second target positioned on the instrument axis at a second distance relative to the first location; and a marker configured to indicate the location of the instrument axis; wherein the mask comprises an aperture having a mask axis that can be positioned substantially collinear with the instrument axis, further wherein the mask comprises an annulus configured to be substantially opaque to visible light and to extend between the aperture and an outer periphery of the mask, the annulus having an inner peripheral region between a central region and the aperture and an outer peripheral region between the central region and the outer periphery of the mask, the inner peripheral, central and outer peripheral regions each having a nutrient transport structure for conveying nutrients between anterior and posterior surfaces of the mask, the nutrient transport structure providing an amount of open area per unit area in the central region that is greater than an amount of open area per unit area in at least one of the outer peripheral region and the inner peripheral region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for aligning an implant with a visual axis of an eye of a patient, the apparatus comprising:
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an instrument having an instrument axis and an aperture through which the patient may look along the instrument axis; and wherein the implant comprises an aperture having an implant axis that can be positioned substantially collinear with the instrument axis, the implant further comprising a annulus configured to be substantially opaque to visible light and to extend between the aperture and an outer periphery of the implant, the annulus having an inner peripheral region between a central region and the aperture and an outer peripheral region between the central region and the outer periphery of the implant, the inner peripheral, central and outer peripheral regions each having a nutrient transport structure for conveying nutrients between anterior and posterior surfaces of the implant, the nutrient transport structure providing a concentration of open area in the central region that is greater than a concentration of open area in at least one of the outer peripheral region and the inner peripheral region.
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18. An apparatus for aligning a corneal implant with a visual axis of an eye of a patient, the apparatus comprising:
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an instrument having an instrument axis and an aperture through which the patient may look along the instrument axis; and wherein the corneal implant comprises an aperture having a corneal implant axis that can be positioned substantially collinear with the instrument axis, the corneal implant further comprising a annulus configured to be substantially opaque to visible light and to extend between the aperture and an outer periphery of the corneal implant, the annulus having an inner peripheral region between a central region and the aperture and an outer peripheral region between the central region and the outer periphery of the corneal implant, the inner peripheral, central and outer peripheral regions each having a nutrient transport structure for conveying nutrients between anterior and posterior surfaces of the corneal implant, the nutrient transport structure providing a concentration of open area in the central region that is greater than a concentration of open area in at least one of the outer peripheral region and the inner peripheral region.
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Specification