▁int ra oc ular ▁pressure ▁correl ates ▁with ▁the ▁int ra oral ▁resistance ▁associated ▁with ▁the ▁instrument , ▁and ▁linked ▁inter mitt ent ▁elev ation ▁of ▁int ra oc ular ▁pressure ▁from ▁playing ▁high - res istance ▁wind ▁instruments ▁to ▁inc idence ▁of ▁visual ▁field ▁loss . ▁The ▁range ▁of ▁int ra oral ▁pressure ▁involved ▁in ▁various ▁classes ▁of ▁eth nic ▁wind ▁instruments , ▁such ▁as ▁Native ▁American ▁fl utes , ▁has ▁been ▁shown ▁to ▁be ▁generally ▁lower ▁than ▁Western ▁classical ▁wind ▁instruments . ▁ ▁Dru gs ▁ ▁In tra oc ular ▁pressure ▁also ▁var ies ▁with ▁a ▁number ▁of ▁other ▁factors ▁such ▁as ▁heart ▁rate , ▁resp iration , ▁fluid ▁int ake , ▁system ic ▁medic ation ▁and ▁top ical ▁dru gs . ▁Al co hol ▁and ▁mar iju ana ▁consumption ▁leads ▁to ▁a ▁trans ient ▁decrease ▁in ▁int ra oc ular ▁pressure ▁and ▁c aff e ine ▁may ▁increase ▁int ra oc ular ▁pressure . ▁ ▁T aken ▁or ally , ▁g ly cer ol ▁( o ften ▁mixed ▁with ▁fruit ▁ju ice ▁to ▁reduce ▁its ▁sweet ▁taste ) ▁can ▁cause ▁a ▁rapid , ▁temporary ▁decrease ▁in ▁int ra oc ular ▁pressure . ▁ ▁This ▁can ▁be ▁a ▁useful ▁initial ▁emer gency ▁treatment ▁of ▁sever ely ▁elev ated ▁pressure . ▁ ▁The ▁dep olar ising ▁mus cle ▁relax ant ▁succ in yl ch oline , ▁which ▁is ▁used ▁in ▁an a est hes ia , ▁trans ient ly ▁increases ▁I OP ▁by ▁around ▁ 1 0   mm H g ▁for