AVH Technology®

Anti-Vaulting Haptic Technology

Only Rayner injectable IOLs incorporate AVH Technology® to give unsurpassed clinical results.

The uncompromising stability resulting from AVH Technology® gives:

• Outstanding fixation within the capsular bag
• Perfect centration
• Superb anterior / posterior stability
• Excellent rotational and torsional stability
• No twisting or buckling
• Accurate, predictable and sustainable refractive results
• Reduced incidence of post-operative complications.

The outer haptics begin to take up the compression due to post-operative capsular contraction with a progressive resistance to the contractual forces being generated within the capsular bag.

The outer haptics engage the inner haptics and new bending fulcra are created. This altered haptic configuration assumes less flexibility which is calculated to generate centration forces within the IOL.

The haptic tips gently meet the IOL optic and are effectively locked into position. The IOL forms an oval configuration and is well able to withstand excessive and / or asymmetrical capsular contraction whilst maintaining perfect centration.

Charts – IOL Compression characteristics

At all times, the graph should show a positive gradient. A negative gradient indicates that the lens may be twisting, buckling or vaulting.

Only the Rayner C-flex®, Superflex®, T-flex®, M-flex® and M-flex®T IOLs have compression graphs with constant positive gradients clearly demonstrating a superior stability.

Chart 1 – Compression characteristics of C-flex® in water at 35°C

Chart 1 demonstrates the ideal compression characteristic and accurately describes the performance of the Rayner C-flex® IOL. It clearly demonstrates the progressive nature of the haptic compression and the rate change as the outer haptic node contacts the inner haptic face at 10.0mm and locks. This allows the haptics to continue resisting the capsular contraction whilst maintaining IOL centration and planar stability.

Chart 2 – Compression characteristics of 4 currently available competitive IOLs in water at 35°C

Lens “A”
Demonstrates no axial displacement until at 10.25mm diameter, when the optic displaces posteriorly by approximately 2 mm and the haptics buckle.

Lenses “B”, “C” and “D”
Demonstrates the inability of each lens to resist capsular contraction, in every case resulting in instability.