Rinehart Reeves

A large-diameter lens and a design intended for orthokeratology, it features reverse geometry, which can be an aid when fitting it to an irregular cornea.

McGuire K

This lens system is a multi-curve design that aims to achieve a feather touch or mild bearing on the cone apex. There are three fitting sets in the McGuire system: the nipple (8.1 mm diameter, 5.5 mm OZ), oval (8.6 mm diameter, 6 mm OZ), and globus (9.1 mm diameter, 6.5 mm OZ). The design has four peripheral curves and the initial base curve should be selected using the mean K reading.

Woodward K

This lens design aims for equal distribution of lens mass across the cornea. It is a tri-curve design with a three-point touch-fitting philosophy. The steeper lenses have greater edge clearance to closely match three-point touch-fitting philosophy.

Soper K

A lens system that employs bicurve lenses based on sagittal depth. A steeper lens is selected by maintaining the same base curve but increasing the diameter. Three fitting sets are available: mild, moderate, and advanced. The peripheral curve of this system is constant. Peripheral alignment and apical clearance typify this lens design.