Maximum Light Transmission - Better Visual Quality
Not all diffractive IOLs are the same. The unique design of Reviol’s Active-Diffractive zones provides excellent light transmission at maximum range under any light condition.
Diffractive Zones of Reviol
The performance of multifocal IOLs is based on their establishment of diffractive zones. The different number, height, interval and width of the rings affect patient total visual outcomes under lower light conditions. Diffractive multifocal IOL engineering is based on balanced light energy between foci. Narrow rings increase the near addition. Conversely higher steps enable the transfer of more energy to near focus1.
Pupil Independent Light Transmission - Increased Contrast Sensitivity
Reviol’s Active-Diffractive optic preserves a better balance of 60% far and 40% near focus at 6mm pupil aperture. Balanced light distribution under any light condition increases contrast sensitivity.
Decreased contrast sensitivity in mesopic light condition has been reported in pupil dependent multifocal IOLs . This phenomenon is explained by a light distribution change of 90% for far focus and 10% for near focus at 6mm pupil diameter. The lower energy transfer to near focus causes poor visual acuity in the patient.
3,75D Near Addition - Improved Intermediate Vision
3.75D near addition in Reviol’s Active-Diffractive Optic has the appropriate balance to provide better intermediate visual acuity.
Near addition is crucial in energy distribution through near to distance focus. Insufficent near addition results in inadequate disparity between foci, which causes blurring vision at intermediate focus. Excessive near addition eliminates focus overlapping and provides sharp near and distance vision. On the other hand reduced visual performance may result, which causes difficulties in patient adaptation.
Visual Performance After Implantation - Enhanced Visual Acuity For All Distances
In the results of defocus curve graphic, Reviol’s Active-Diffractive optic has better intermediate vision than Apodized +4.0D multifocal IOLs, and better near visual performance in comparison with Apodized +3.0D multifocal IOLs.
The defocus curve was determined in a comparative study on 130 eyes of 87 patients and included a comparison with Reviol +3.75D near addition, an apodized multifocal IOL +3.0D near addition and an apodized multifocal IOL +4.0D near addition.
Ring Transition Zones - Limited Photopic Phenomena
Reviol’s progression zones are rounded in a unique manufacturing process.
Exceptional Optic Engineering - Square Edge and Aspheric Design
Reviol’s enhanced 360° square edge and premium material form a dual barrier against PCO formation after implantation. The aspheric design of the Reviol “UD technology”, compensates for the positive spherical aberration of the cornea while preserving depth of focus.
Recent studies concluded that a square edge on the posterior optic surface is the most important IOL-related factor against PCO formation. According to different experimental studies, this may be due to the mechanical barrier effect exerted by the square edge.
Depth of Focus
Corneal topography measurements on 71 cataract patients have shown that average spherical aberration of the human cornea is +0.27 microns. With spheric IOL implantation total ocular spheric aberration becomes increasingly positive. Poor contrast sensitivity has been reported in many postoperative cataract patients after implantation of spheric IOLs.
Best of Both Worlds!
Excellent material combination of 2-Oxiethylmethacrylate and 2-Hydroxymethacrylate monomers creates hydrophobic surface behavior with the advantage of hydrophilic flexibility.
Proven Hydrophobic Surface Behavior
AcrivaUD has similar contact angle measurements similar to pure hydrophobic IOLs. An independent comparative study showed that the hydrophobic surface of AcrivaUD is similar to that of pure hydrophobic competitors.
Benefits of Hydrophobic and Hydrophilic Monomers
The elastic co-polymer of AcrivaUD has precise memory. Point Spread Function (PSF) shows that the optic quickly recovers its initial shape within one hour, much quicker than hydrophobic IOLs.
Better Visual Quality
The MTF of all AcrivaUD lenses is checked one by one and value is always above international standards limits. AcrivaUD products demonstrates superior MTF and smooth surface topography, thanks to our innovative optic engineering.
Modular Transfer Function
MTF is a direct and quantitative measurement of optic system quality. The best result through obstacles is 0.7 at 100 lpm. According to international standards the MTF result at an IOL must be above 0.43 at 100 lpm3.
VSY Biotechnology has determined its own quality control limits far stricter than international standards.
Real PCO Barrier
The innovative edge design tends to greatly reduce PCO risk by forming a geometric and mechanical barrier against cells proliferation. The edge design produces thinner lenses for equivalent power than competitors.
All Square 360° enhance edge and premium material form a dual barrier against the risk of posterior capsule opacification after implantation. Recent studies have shown that square edge on posterior surface of the optic is the most important IOL-related factor against PCO formation.
Advanced Vision of Aspheric Design
Ultra Definition optic design corrects spherical aberrations coming from both cornea and IOL. However, AcrivaUD IOLs have a slight negative asphericity, which maintains part of the positive aberration of the cornea, helping patient to keep better depth of focus.
Advantage of Ultra Definition Design
- Improved contrast sensitivity under low light condition
- Preserved depth of focus
- Less sensitive to decentration
Abbe Number of AcrivaUD is 58, one of the highest numbers in the IOL market, measured by independent laboratory. Superior chromatic aberration control in all AcrivaUD lines.
The Importance of Abbe Number
Chromatic aberration is type of distortion in optical system formed by different wavelengths of light to have different focal points. The higher the Abbe number is the lower the chromatic dispersion is.
AcrivaUD has a full range of diopters from -20.00D to +45.00D, in 0.50D increments.
Special production is from -20.00D to 0.0D and from +32.00D to +45.00D in 0.50D increments.