ADVANCED POLYMER - SUPERIOR PERFORMANCE IN OPHTHALMIC SURGERY
Called ‘Imperial 25’, these improved mechanical properties allow for its superior elastomeric,
pre-insertion folding and post incision recovery of properties.
The Imperial 25 material provides an implant with exceptional cosmetic and optical properties.
It is also more durable and more forgiving than any other foldable material on the market today.
Both components are glass distilled to greater than ninety-nine and one half percent
( >99.5% ) purity. The polymerization of Imperial 25 is done under reaction conditions that ensure
very low residual levels of either unreacted monomer. Residuals are completely removed during
hydration, as the polymer becomes a hydrogel. ( 1 )
The resulting polymer network is a totally inert, one hundred percent ( 100% ) acrylic hydrogel.
Imperial 25 has shown to be highly biocompatible with more than a million implants and zero
complications, zero adverse reactions and extremely low PCO ( 2 ) rates and it has the stability
required for long-term implantation. Many inexpensive basic p-HEMA IOLs have been in the market
worldwide for a number of years and some have had serious opacification problems.
Chinla-TV, Walker LN, Constable IJ, Thompson DE, Barnes GD: Cytotoxic effects of
residual chemicals from polymeric biomaterials for artificial soft intraocular lenses;
J Cat. Ref. Surg. 1991, March.
Advanced Polymer - EOEMA
The material is a 2-Ethyl Oxy Ethyl Meth Acrylate ( EOEMA ).
Poly-HydroxyEthyl MethAcrylate ( p-HEMA ) are hydrophilic monomers that form
homo-polymers with water contents of 25% - 38%. In contrast, EOEMA is a hydrophobic monomer
that, when combined with 2-HEMA, forms a copolymer with lower per molecule water content,
a higher refractive index and superior mechanical properties.
Phan DF, Wollensak J. and Warner C; Implantation of folding posterior chamber
Lenses, Klin Monatsbl Augerhellkr 1991 March.
Korber, Norbert Prof. M.D., J. Paultos, Bertran Meyer;
New Foldable Hydrophilic IOL Achieves Excellent Visual Acuity
Good Centration and No Lens-Related Complications German Study Shows;
ESCRS / Eurotimes September, 2000.
Noble A, Hayward JM, Huber G.;
Secondary evaluation of hydrogel lens implants: EYE 1990.
( 2 )
( 3 )
( 4 )
( 1 )
Shelf life studies show that Imperial 25 implants stored in saline solution at approximately 40°C.
for periods of over 10 years show no significant aging, opacification, or changes in optical quality.
EOEMA is a much more dependable and a more stable material whose clarity and optical properties
are not affected by the aging of the material. ( 3,4 )
The combination of the above factors, along with an unequaled positive track record in the market,
make the choice of using an implant made from “Imperial 25” a very safe choice for all high
performance implantable applications.