摘要:
Methods for providing a contact lens are described. According to a first embodiment, a patient is fitted with an optical preform and the position on the surface of the optical preform corresponding to the center location of the patients's pupil is identified. Then, the optical preform, a volume of polymerizable resin, and a mold comprising a casting zone are arranged, so that the resin occupies at least the intervening space between the mold and the optical preform in the area of the casting zone and so that the casting zone on the mold is aligned to a predetermined position with respect to the position on the surface of the optical preform corresponding to the center of the patient's pupil. Finally, the resin is polymerized to provide a contact lens with an optical modification corresponding to the casting zone. According to another embodiment, a mold having a weight or stabilization zone is selected to provide a resin mass on an optical preform (which can be, for example, toric, bifocal or multifocal, and so forth) sufficient to stabilize the optical preform. The resin mass is provided in a position based, for example, on the axis of cylinder of the finished lens, the orientation of the bifocal/multifocal region on the finished lens, and so on.
摘要:
Many modern implantable ophthalmic devices include electronic components, such as electro-active cells, that can leak harmful substances into the eye and/or surrounding tissue. In the implantable ophthalmic devices disclosed herein, electronic components are hermetically scaled within cavities formed by bonding together two or more glass wafers. Bonding the glass wafers together with laser fusion bonding, pressure bonding, or anodic bonding creates a seal that leaks at a rate of less than about 5×10−12 Pa m3 s−1 when subjected to a helium leak test. Hermetically sealed feedthroughs formed of conductive material running through channels in the wafers provide electrical connections to components inside the sealed cavities. In some cases, the conductive material has a coefficient of thermal expansion (CTE) that is roughly equal to (e.g., within 10% of) the CTE of the glass wafers to minimize leakage due to thermally induced expansion and contraction of the conductive material and the glass wafer.
摘要翻译:许多现代可植入眼科装置包括可将有害物质渗入眼睛和/或周围组织的电子部件,例如电活性细胞。 在本文公开的可植入眼科装置中,电子部件通过将两个或更多个玻璃晶片结合在一起形成的空腔内被气密地缩放。 通过激光熔接,压力粘合或阳极接合将玻璃晶片结合在一起形成密封,当进行氦气泄漏测试时,密封件以小于约5×10-12 Pa m3 s-1的速率泄漏。 由导电材料形成的密封馈通通过晶片中的通道提供电连接到密封空腔内的组件。 在一些情况下,导电材料的热膨胀系数(CTE)大致等于玻璃晶片的CTE的(例如,在10%以内),以最小化由于导致导电材料的热诱导的膨胀和收缩引起的泄漏, 玻璃晶片。
摘要:
Astigmatism is an optical aberration that displaces the eye's vertical focal plane with respect to its horizontal focal plane. This displacement in focal planes, which may be caused by an irregularly shaped cornea and/or crystalline lens, causes images to appear blurry. Astigmatism can be corrected by implanting an optic, such as section of a spherical lens, whose projection onto a plane perpendicular to the optical axis is noncircular (e.g., rectangular or elliptical). Because the optic is noncircular, it provides more optical power along one axis than along another axis. As a result, it introduces an astigmatism that can be used to offset or compensate the eye's corneal and/or lenticular astigmatism when aligned properly with respect to the principal meridians of the cornea and/or crystalline lens.
摘要:
Embodiments of the present invention disclosed herein are directed to apparatuses and systems for reducing the image jump from a dynamic lens component. The apparatuses and systems disclosed herein may be used in ophthalmic devices, such as eye glasses or contact lenses, as well as any other suitable application. Embodiments provide a first apparatus that comprises a dynamic power zone having a periphery. The first apparatus further comprises a static power zone in optical communication with at least a portion of the dynamic power zone. The static power zone has a negative optical power at a first portion of the periphery of the dynamic power zone.
摘要:
Progressive lens designs are provided with various features relative to the corridor width, corridor length, and relative positioning of areas of maximum gradient power progression and maximum gradient, that differ from conventional progressive lens designs. Progressive lenses according to the invention may include a “V-shaped” cylinder map, a relatively low position of maximum gradient of power progression, and/or a large vertical separation between vertical position of maximal cylinder and vertical position of maximum gradient of power progression.
摘要:
A sensor is provided to detect an accommodative trigger, particularly ion concentration. The sensor can send a signal to an optical component, which in turn can respond by changing optical power to focus on a near object.
摘要:
A method for providing a contact lens for a patient. According to this method, an optical preform is selected, and a resting position of the optical preform on the patient's eye is determined. An optical feature is also located on a patient's eye. Then, a reference position is located on the surface of the optical preform coincident with the optical feature on the patients eye, when the optical preform is in the resting position. Finally, the optical modification is machined on the optical preform at a location based on the reference position on the optical preform.
摘要:
A method for making improved optical quality lenses is described which includes arranging a mold having a molding surface, a curable optical quality resin composition, and a plastic lens preform of optical quality material such that the resin composition is disposed between, and in contact with, the plastic lens preform and the mold; upon curing, the resin composition forms a cured plastic attached portion that is bonded to the plastic lens preform. The resin composition and plastic lens preform are selected such that the attached portion has a higher scratch resistance, a lower chromatic aberration, and/or a higher ease of edging than the lens preform.
摘要:
A method for providing a contact lens for a patient. According to this method, an optical preform is selected, and a resting position of the optical preform on the patient's eye is determined. An optical feature is also located on a patient's eye. Then, a reference position is located on the surface of the optical preform coincident with the optical feature on the patients eye, when the optical preform is in the resting position. Finally, the optical modification is provided on the optical preform at a location based on the reference position on the optical preform.
摘要:
A method for making improved optical quality lenses is described. The method includes arranging a mold having a molding surface, a curable optical quality resin composition, and a plastic lens preform of optical quality material such that the resin composition is disposed between, and in contact with, the plastic lens preform and the mold. Upon curing, the resin composition forms a cured plastic attached portion that is bonded to the plastic lens preform. The resin composition and plastic lens preform are selected such that the attached portion has a higher scratch resistance, a lower chromatic aberration, and/or a higher ease of edging than the lens preform.