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Keraring intrastromal corneal ring segments are implantable precision devices used to correct corneal surface irregularities and reduce refractive errors associated with keratoconus and other corneal ectatic disorders. Unlike other intracorneal rings, Keraring was specifically designed to treat corneal ectasia, providing better and greater corneal surface regularization and refractive correction.

FEATURES AND BENEFITS:

VARIABLE OPTICAL ZONES:

Keraring is available in two models (SI-5 and SI-6) for 5.0 mm implantation in optical zones of 5.0, 5.5 and 6.0mm, offering surgeons additional options to meet each patient’s needs.

VARIABLE ARC LENGTHS AND THICKNESSES:

Keraring offers 40 different variations of thicknesses, arc lengths and diameters, allowing for enhanced customization of corneal remodeling and refractive correction.

UNIQUE PRISMATIC DESIGN:

Keraring’s design generates a prismatic effect by which the light coming through the implant is reflected, reducing the incidence of glare and halos.

GREATER REFRACTIVE CORRECTION:

Keraring corrects low, moderate, and high degrees of myopia and astigmatism.

PROVEN CLINICAL SAFETY:

Extensive track record of use and longest follow-up worldwide: over 150,000 implants followed up for as long as 18 years. Independent clinical trails have confirmed Keraring’s safety and effectiveness.

REVERSIBILITY:

Keraring may be explanted at any time, allowing the cornea to revert to its original preoperative shape. The procedure is reversible.

ADJUSTABILITY:

Refractive and topographic results may be easily readjusted by exchanging or repositioning the implant.

COMPATIBILITY WITH OTHER PROCEDURES:

Keraring implants may be synergistically combined with other techniques such as corneal collagen crosslinking, PRK and phakic IOL implantation.

DOES NOT COMPROMISE CORNEAL TRANSPLANTATION:

Keraring does not interfere with normal execution of lamellar or penetrating keratoplasty, if needed.

OUTSTANDING PATIENT SATISFACTION:

Keraring patients report highly positive improvements in their quality of life.

QUICK VISUAL RECOVERY:

Minimally invasive technique allows patients to rapidly resume their normal activities. Topographic and refractional changes are noticeable right after implantation and stabilize in 3 months on average.

SURGICAL TECHNIQUE AND TRAINING:

Keraring implantation is a simple outpatient procedure performed under topical anesthesia. Surgical instruments have been specifically developed by Mediphacos for manual and femtosecond laser assisted techniques. Keraring surgeons must attend one of the certification courses regularly offered by Mediphacos and its authorized distributors. Please contact us for current program schedules or to request training in your own practice.

NOMOGRAMS AND CONSULTANCY:

Keraring surgical outcomes are greatly dependent on accurate selection of implant size and position for each individual patient. Based on extensive statistical analysis of results, Mediphacos constantly updates the calculation nomograms and provides surgeons with personal attention and highly reliable expert support.

SPECIFICATIONS:

• Material: Medical Grade PMMA
• Models: SI5 (5mm optical zone). SI6 (5.5mm or 6mm optical zone)
• Variable thickness: 150μm to 350μm (all models) in 50μm increments.
• Variable arc length:
• SI-5: 90º, 120º, 160º and 210º
• SI-6: 90º, 120º, 150º and 210º
• Keraring is presented with one ring segment per box.

INDICATIONS:

• Keratoconus with poor BSCVA and contact lens intolerance
• Progressing keratoconus
• Pellucid marginal degeneration
• Post Lasik ectasia
• Irregular astigmatism following radial keratotomy
• High astigmatism secondary to penetrating keratoplasty
• Post-trauma corneal irregularities

CONTRA-INDICATIONS:

• Acute keratoconus with keratometry > 70 D
• Major central corneal opacity
• Hydrops
• Following penetrating keratoplasty when graft is decentered
• Severe atopic disease
• Recurring corneal erosion syndrome
• Patient's high expectations to achieve emmetropia

MECHANISMS OF ACTION:

• Corneal remodeling through addition technique: preserves corneal integrity
• Corneal topography regularization and refractive correction preserving the natural prolate profile, reducing optical aberrations and improving visual acuity and contact lens tolerance
• Displacement of corneal apex towards the central pupil
• Corneal stabilization, delaying or eliminating the need for corneal transplantation

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