摘要:
A trial lens has a lens surface provided with an index. A stable position of the trial lens on a cornea is measured by the use of the index. The position of an optical center of a contact lens can be determined based on the measurement to set the position of the optical center of the contact lens so as to be matched with individual wearers.
摘要:
A contact lens including a circumferential positioning member (40, 42, 44, 46) that can selectively set up a first stable state where a superficial center (30) of a second power zone (24) is decentered on a symmetrical meridian (22) from a geometrical center (20) of an optical zone (14) and an orthogonal meridian (34) perpendicular to the symmetrical meridian (22) with the lens worn on a right eye is circumferentially tilted by a first angle relative to a vertical line (50) of the eye, and a second stable state where the orthogonal meridian (34) under condition in which the lens is worn on a left eye with the right eye wearing state inverted upside down is circumferentially tilted by a second angle on the opposite side of the first angle relative to the vertical line (50), as well as a visible indicator mark (48) for identifying a lens orientation.
摘要:
Method for providing an optical system (OS) of an ophthalmic spectacle lens according to wearer's prescription data and wearer's optical needs with the provision that a wearer's optical need is not related to prescription data, where said optical system (OS) is defined by at least a front and a back surfaces (S1, S2) and their relative position, comprising the steps of: a) providing a semi-finished lens blank (SB); b) providing contour data (CD); c) choosing at least one localized optical feature (LOFi) suitable for the wearer's needs; d) positioning the contour data (CD) wherein the semi-finished lens blank comprises: a first surface (SB1) having in each point a mean sphere value (SPH mean ) and a cylinder value (CYL), a second unfinished surface, the first surface (SB1) comprising: a main area; - at least a peripheral area (Ai).
摘要:
Method for providing an optical system (OS) of an ophthalmic spectacle lens according to wearer's prescription data and wearer's optical needs with the provision that a wearer's optical need is not related to prescription data, where said optical system (OS) is defined by at least a front and a back surfaces (S1, S2) and their relative position, comprising the steps of: a) providing a semi-finished lens blank (SB); b) providing contour data (CD); c) choosing at least one localized optical feature (LOFi) suitable for the wearer's needs; d) positioning the contour data (CD) wherein the semi-finished lens blank (SB) comprises: -a first surface (SB1) having in each point a mean sphere value (SPH mean ) and a cylinder value (CYL), -a second unfinished surface, the first surface (SB1) comprising: -a plurality of primary areas (Ai); -border areas (Bi);and -a secondary area.
摘要:
A method of designing an aspheric ophthalmic lens capable of reducing aberration of an eye, comprises: a step of modeling an optical system including a cornea and an ophthalmic lens by inclining the optical system about a rotation point by a predetermined angle in consideration of a displacement angle between an optical axis and a visual axis of the eye (1); a step of calculating aberration resulting from the modeled optical system; and a step of designing a shape of at least one of a front surface and a back surface of the ophthalmic lens to reduce the aberration resulting from the modeled optical system.
摘要:
The present invention provides a contact lens having an orientation/stabilization and optionally translation feature that does not provide an prism optical distortion and can effectively maintain a predetermined orientation of the lens on an eye. Like a conventional lens ballast, the orientation feature of the invention works by weighing the lens at its lower half portion, causing it to come to an equilibrium on the eye. With such orientation feature, the optical zone of the anterior surface can be designed independently to provide an optimal visual performance.
摘要:
Disclosed is a contact lens (10) having a refractive power ranging from -15.0 to +15.0 diopters in an optical zone (18) thereof, wherein a back optical zone (12a) is a conical surface having a conic coefficient ranting from -0.04 to -0.49, and a front optical zone (14a) is a conical surface having a conic coefficient ranging from -0.02 to -0.50. The contact lens provides optical characteristics required in consideration of an optical system of an eye when being positioned at a position of rest during wear in which an optical axis of the optical zone is decentered with respect to an optical axis of the eye.
摘要:
The present provides lenses in which the one surface incorporates wavefront aberration correction as well as corneal topographic data. Additionally, the invention provides methods for manufacturing such lenses.