ra oc ular ▁pressure ▁measurements ▁to ▁appear ▁normal ▁when ▁in ▁fact ▁the ▁pressure ▁may ▁be ▁ab norm ally ▁high . ▁A ▁newer ▁trans pal pe br al ▁and ▁trans s cler al ▁ton ometry ▁method ▁is ▁not ▁influenced ▁by ▁cor ne al ▁bi ome chan ics ▁and ▁does ▁not ▁need ▁to ▁be ▁adjust ed ▁for ▁cor ne al ▁irregular ities ▁as ▁measurement ▁is ▁done ▁over ▁upper ▁e y el id ▁and ▁s cl era . ▁ ▁Classification ▁Current ▁cons ensus ▁among ▁o ph th alm olog ists ▁and ▁opt omet rist s ▁define ▁normal ▁int ra oc ular ▁pressure ▁as ▁that ▁between ▁ 1 0 ▁mm H g ▁and ▁ 2 0 ▁mm H g . ▁The ▁average ▁value ▁of ▁int ra oc ular ▁pressure ▁is ▁ 1 5 . 5 ▁mm H g ▁with ▁fl uct u ations ▁of ▁about ▁ 2 . 7 5 ▁mm H g . ▁ ▁O cular ▁hy pert ension ▁( O HT ) ▁is ▁defined ▁by ▁int ra oc ular ▁pressure ▁being ▁higher ▁than ▁normal , ▁in ▁the ▁absence ▁of ▁opt ic ▁n erve ▁damage ▁or ▁visual ▁field ▁loss . ▁ ▁O cular ▁hyp ot ension , ▁hyp ot ony , ▁or ▁oc ular ▁hyp ot ony , ▁is ▁typically ▁defined ▁as ▁int ra oc ular ▁pressure ▁equal ▁to ▁or ▁less ▁than ▁ 5 ▁mm H g . ▁Such ▁low ▁int ra oc ular ▁pressure ▁could ▁indicate ▁fluid ▁leak age ▁and ▁def lation ▁of ▁the ▁e y eb all . ▁ ▁In fl uen cing ▁factors