Methods of designing reverse geometry lenses for myopia control

A lens design machine for generating an aspheric contact lens design for facilitating myopia control of a cornea of an eye of a patient, the machine including:

• a measurement device for obtaining measurement for a degree of refractive error of the eye and for obtaining measurement of one or more biomechanical properties of the cornea;
• a computer processor and memory having a stored as a set of instructions for execution by a computer processor to:
• select a base curve profile for a central zone based on the refractive error and the one or more biomechanical properties of an eye of the patient, the base curve profile defining a compression force strength on the cornea when the contact lens is positioned on the eye, the base curve profile including a central zone tear layer thickness and a central zone radius of curvature;
• define a width of a reverse zone adjacent to and encircling the central zone;
• select a reverse curve profile for the reverse zone compatible with the base curve profile, the reverse curve profile defining a tension force strength on the cornea when the contact lens is positioned on the eye, the reverse curve profile including a reverse zone tear layer thickness and a reverse zone radius of curvature;
• modify the base curve profile adjacent to the reverse zone by applying a selected base eccentricity curve profile for enhancing the tension force strength of the reverse zone, said applying contributing to the aspheric nature of the contact lens, the base eccentricity curve profile including an aspheric zone tear layer thickness and an aspheric zone base eccentricity;
• wherein the compression force strength and the tension force strength of the contact lens cooperate to reshape corneal curvature in a mid-peripheral region to address the myopia control when the contact lens is applied to the eye.

An aspheric contact lens for facilitating myopia control of a cornea of an eye of a patient, the contact lens including:

• a base curve profile for a central zone based on the refractive error and the one or more biomechanical properties of an eye of the patient, the base curve profile defining a compression force strength on the cornea when the contact lens is positioned on the eye, the base curve profile including a central zone tear layer thickness and a central zone radius of curvature;
• a width of a reverse zone adjacent to and encircling the central zone;
• a reverse curve profile for the reverse zone compatible with the base curve profile, the reverse curve profile defining a tension force strength on the cornea when the contact lens is positioned on the eye, the reverse curve profile including a reverse zone tear layer thickness and a reverse zone radius of curvature;
• a modification of the base curve profile adjacent to the reverse zone including an applied selected base eccentricity curve profile for enhancing the tension force strength of the reverse zone, the selected base eccentricity curve profile contributing to the aspheric nature of the contact lens, the selected base eccentricity curve profile including an aspheric zone tear layer thickness and an aspheric zone base eccentricity;
• wherein the compression force strength and the tension force strength of the contact lens cooperate to reshape corneal curvature in a mid-peripheral region to address the myopia control when the contact lens is applied to the eye.