Abstract: The invention relates to a method of making a contact lens, the method comprising identifying the eccentricity of a lens produced in a mold half, lathing the lens and adjusting the path of the lathe to take account of the eccentricity, and a computer program for controlling the lathe.

Abstract: The invention relates to a method of making a contact lens, the method comprising identifying the eccentricity of a lens produced in a mould half, lathing the lens and adjusting the path of the lathe to take account of the eccentricity, and a computer programme for controlling the lathe.

Abstract: Disclosed is a method of determining an appropriately shaped soft contact lens for a subject with an irregular cornea, the method comprising the steps of: inferring or deducing the profile of the cornea over at least a portion thereof: selecting a first choice fitting lens, the selection being based on the profile of the cornea obtained in the preceding step; assessing the fit of the contact lens to the cornea, by investigating each of the following parameters; (i) translational movement of the lens on eye; (ii) rotation of the lens on eye; (iii) centration of the lens on eye; (iv) the perceived comfort of the lens for the subject; (v) the visual acuity of the subject when wearing the lens; and adjusting the choice of fitting lens, if required, according to the assessment and reiterating until a desired fit of lens to the cornea has been obtained.

Abstract: Disclosed is a method of determining an appropriately shaped soft contact lens for a subject with an irregular cornea, the method comprising the steps of: inferring or deducing the profile of the cornea over at least a portion thereof: selecting a first choice fitting lens, the selection being based on the profile of the cornea obtained in the preceding step; assessing the fit of the contact lens to the cornea, by investigating each of the following parameters; (i) translational movement of the lens on eye; (ii) rotation of the lens on eye; (iii) centration of the lens on eye; (iv) the perceived comfort of the lens for the subject; (v) the visual acuity of the subject when wearing the lens; and adjusting the choice of fitting lens, if required, according to the assessment and reiterating until a desired fit of lens to the cornea has been obtained.

Abstract: The invention relates to a method of designing a soft contact lens, said lens having a central optic zone and with a peripheral zone around the central optic zone; the method comprising the steps of: (a) defining a back surface of the lens which is a satisfactory fit to the surface of a subject's cornea; (b) defining a front surface of the lens over at least the central optic zone, which surface is selected so as to ameliorate the subject's vision defects; (c) checking that the lens meets a desired range of thickness values at one or more selected parts of the lens and, if not, recalculating the front surface over at least the central optic zone so as to meet said desired thickness value range, wherein the lens is to be made of a substance having a Young's modulus in the range 0.08 to 0.40 MPa, and wherein the junction thickness of the lens is in the range 0.15-0.40 mm.

Abstract: Disclosed is a method of designing a soft contact lens, the method comprising the steps of: (a) measuring or defining a wavefront generated by passage of light through a selected eye and using the wavefront to generate a computer model of the optical characteristics of the selected eye; (b) measuring or defining the topography of the cornea of the selected eye; (c) incorporating into the computer model a soft contact lens, the posterior surface topography of which is defined by the topography of the cornea, offset by an arbitrary amount intended to represent the tear layer thickness of the selected eye, said lens having a defined thickness at a selected locus on the anterior surface; (d) calculating a desired topography for the anterior surface of the lens such that the wavefront will be corrected to assume a desired pattern (for example, preferably planar, the plane of which is perpendicular to the optical axis of the lens) when passing through the computer model eye/lens combination; (e) remodeling the lens