PermaVision intracorneal lens for the correction of hyperopia

Abstract

Sutureless synthetic keratophakia with the PermaVision intracorneal lens is a new technique for the correction of hyperopia. It is easy to perform as well as reversible, and the learning curve of the experienced laser in situ keratomileusis surgeon is short. The technique was safe and effective for spherical hyperopia, but longer follow-up and additional cases are needed to draw conclusions about the efficacy of the technique.

Confocal assessment of the corneal response to intracorneal lens insertion and laser in situ keratomileusis with flap creation using IntraLase

“…Other clinical studies of PermaVision lenses in hyperopic human patients report few complications and satisfactory optical results. 8,9 However, Alió et al 32 report increased spherical, coma, and total higher-order aberrations following hydrogel ICL implantation. In a study using in vivo confocal microscopy, they also report perilenticular corneal opacity, deposits and epithelioid cells around the inlays, keratocyte activation, and apoptosis.…”

“…Intracorneal lenses do not require the removal of corneal tissue and thus may offer advantages over traditional LASIK, especially in hyperopic patients. 8,9 However, the cellular response of the cornea to PermaVision ICL implant has not been well documented in humans.…”

Histological and Confocal Changes in Rabbit Cornea Produced by an Intrastromal Inlay Made of Hexafocon A

“…Other human studies reported similar safety and efficacy profiles for hyperopia-correcting corneal inlays. 8,9 Recently, we reported our results of a complete intracorneal ring (MyoRing) to correct keratoconus. 10,11,21 However, some human studies reported complications of intrastromal inlays, including significant visual loss and scarring, intrastromal epithelial opacification, and unacceptable visual outcomes.…”

“…Other human studies have reported acceptable visual outcome after corneal inlay implantation for hyperopia correction. 8,9 Newly proposed techniques for management of keratoconus are increasing, which are stimulated by the demand to avoid keratoplasty. Intracorneal segments and MyoRings (Dioptex GmbH, Linz, Austria) have been helpful in attaining this goal.…”

A perfluoropolyether corneal inlay for the correction of refractive error

“…This, in conjunction with added criteria for patient inclusion, should reduce the propensity for peripheral corneal erosions to form. The correction of refractive errors using synthetic corneal inlays placed in a corneal flap made with a microkeratome is a simple, effective surgical procedure [44]. The simplicity of the procedure may be further enhanced by use of newer technologies to surgically implant the device into the corneal tissue.…”