Both RSa and RSb lenses are suitable for the post-surgical cornea, where either refractive surgery or corneal transplant surgery are been performed. This RGP lens design optimizes visual acuity while providing a stable and comfortable fitting relationship.
Versatile enough to fit all post-surgical conditions, this lens easily and consistently provides patients with excellent comfort and visual acuity while fitting the corneal surface.
A combination of spherical and aspheric curves creates alignment with the peripheral cornea, causing it to slightly vault over the surgically altered central cornea. Standard diameters are used for PKP patients, and larger diameters are used for post-refractive patients.
This lens features all versatility of the RSa in consistently providing patients with excellent comfort and visual acuity. It also featured secondary base curve geometry for improved edge clearance on post-refractive patients having excessively steep peripheral corneas.
A large-than-standard diameter is used to aid lens centering.
Both styles can incorportate toric parameters into the design to address patients with significant astigmatism.