The intraocular lens (IOL) is definitely an artificial intraocular lens implantion in eyes, and also have the role of changing natural lens. While IOL bring light to human, does it cause great harm due to quality problem, therefore the studies of enhancing IOL is essential.
Intraocular lens implantation technology, beginning in November 1949, the British ophthalmologist Ridley first homemade artificial lens implantation in patient’s eye. For more than half a century, mainly in the past ten years, scientists on a number of IOLs materials make a lot of experiments, testing the IOL biological qualities from the material and it is clinical qualities.
Output of artificial very material must have the next qualities: (1) good optical qualities, high echoing index, visible light transmittance through rate (more than 90%) (2) the caliber of light, strong tensile (3) The physical and chemical qualities from the eye is stable, durable and powerful, no biodegradation (4) non-toxic, non-caused inflammation, non-carcinogenicity (5) without antigen (6) easy processing.
PMMA since 1933 for industrial items recently, with the introduction of small cut sutureless phacoemulsification surgery,produced a collapsible (soft) IOLs demand, the use of the rigid material PMMA progressively being restricted.
The silicone gel is really a soft IOL biomedical materials success coded in the mid-1970s. The fundamental structure from the silicone gel is really a poly dimethyl siloxane, using dimethyl vinyl siloxane as finish groups, known towards the methyl vinyl silicone.
Hydrogel is among the three primary material after silicone, its chemical composition is hydroxyethyl methacrylate. The acrylic esters could be split into a hydrophobic acrylic ester along with a hydrophilic acrylate. The primary design options that come with the hydrophobic acrylic, alter the HEMA molecular hydroxyethyl to phenethyl, The Acr ysof is really a copolymer composed of phenylethyl acrylate and phenylethyl methyl acrylate, lowering the polarity and water content of the material. Getting the PMMA optical and biological qualities, but includes a soft, could be extended or traction to two occasions compared to original, and within ten seconds after release restored to the original length and shape. The hydrophilic acrylate is hydroxyethyl methacrylate 2 molecules and something molecule of methyl methacrylate, and thru primary chemically crosslinked copolymer is integrated into the macromolecular organic compound, that has both good mechanical qualities and optical qualities,and it has good versatility along with a hydrophilic (water content 26%, the qualities from the HEMA’s).
Acrylate polymer is phenethyl methacrylate, phenethyl methacrylate along with other crosslinked polymerization, is really a type of polymers, known to as acrylate.
The memory materials are methyl methacrylate, hydroxyethyl methacrylate, methyl acrylate, hydroxy phenols, and ethylene glycol diacrylate crosslinking polymerization from the three-dimensional covalent reticular.
As our country exist a sizable cataract patient population, therefore, a sudden requirement to accelerate the the research IOL, to guarantee better effectiveness cataract intraocular lens implantation, and improve the caliber of existence of patients.