Blowing nose would definitely increase the intraocular pressure temporarily. There is other possible damages need your attention too. We know that the nasal passage is connected with eyes through the internal duct. When we catch a cold, there is always secretion in nasal passage which contains dusts, bacteria and virus. When we blow our nose hard, this secretion might be forced by the air to go up through sinus even back into eyes. This is why people always complain some stuff coming out through the corner of eyes when they blow noses ( tear duct is located in the corner of the eye and it is connected with sinus). This secretion might spread the infection to sinus and eyes, resulted in sinusitis and conjunctivitis. It is better not to blow your nose. If you really need to do it, then do it gently.