My son had a severe eye injury, lost all sight and pressue to a four (that was normally 16) . Retina was detached for two months becuase so much blood in the eye the surgeons could nt see where the retina was. Surgurey was done to reattache the retina and they filled the eye with oil . Eye healed well with the exception of a small scar tissue. They performed surgery 5 weeks later because the pressure went up to 12 (from a 4) and put the gas bubble in. He started to regain some vision in 3 days. One week later from the gas bubble surgery, the pressure has dropped to an 8. The surgeon was very surprised it had dropped so much and had no answers as to why....my son goes back in 3 weeks to check the pressure again. Does the pressure drop that much after putting the gas bubble in???