which provides for control over the material 39 s mechanical optical and or thermal properties are provided herein for example the ability to adjust a material 39 s refractive index ri and mechanical properties is important in designing ultra small incision iols also hydrophobic siloxy materials have demonstrated excellent ocular biocompatibility thus it surprisingly has been discovered that by utilizing the silicone materials in the preparation of iol materials an iol optic can be made that has properties permitting its passage through an ultra small incision without damage to the iol the inserter cartridge or the eye in addition the iol may have at least one resilient haptic that shares a common siloxy monomer with the optic silicones have unique properties derived from the inherent flexibility of the siloxane bond the alternating silicon oxygen polymer backbone of siloxanes makes them remarkably more flexible than their organic counterparts that have a carbon oxygen backbone this property of siloxanes results in low glass transition temperatures t g and excellent flexibility furthermore a low initial modulus is another important attribute of the novel siloxanes in order to pass through the insertion cartridge a conventional refractive iol must be capable of elongating up to about 100 therefore it is important that the.