Merocom silica gel hydrogel does not need to add solvents, and there is no risk of chemical solvents irritating or sensitizing eyes, and there is no hidden worry (different from ordinary hydrogel and traditional silica gel hydrogel)? The patent number of silicon hydrogel material can be found: Eautrasil? Technology 2 hydrophilic silicon technology (China patent number N 102558458B).