, ▁Chinese ▁company ▁Ten cent ▁announced ▁it ▁was ▁prepar ing ▁to ▁launch ▁its ▁virtual ▁reality ▁head set ▁that ▁year . ▁As ▁of ▁ 2 0 1 9 , ▁O cul us ▁and ▁Play Station ▁V R ▁domin ate ▁the ▁V R ▁head set ▁market . ▁ ▁Con stra ints ▁ ▁L aten cy ▁requirements ▁ ▁Virtual ▁reality ▁head sets ▁have ▁significantly ▁higher ▁requirements ▁for ▁laten cy — the ▁time ▁it ▁takes ▁from ▁a ▁change ▁in ▁input ▁to ▁have ▁a ▁visual ▁effect — than ▁ordinary ▁video ▁games . ▁If ▁the ▁system ▁is ▁too ▁sl ugg ish ▁to ▁react ▁to ▁head ▁movement , ▁then ▁it ▁can ▁cause ▁the ▁user ▁to ▁experience ▁virtual ▁reality ▁sick ness , ▁a ▁kind ▁of ▁motion ▁sick ness . ▁According ▁to ▁a ▁Val ve ▁engineer , ▁the ▁ideal ▁laten cy ▁would ▁be ▁ 7 - 1 5 ▁mill iseconds . ▁A ▁major ▁component ▁of ▁this ▁laten cy ▁is ▁the ▁refresh ▁rate ▁of ▁the ▁display , ▁which ▁has ▁driven ▁the ▁ad option ▁of ▁displays ▁with ▁a ▁refresh ▁rate ▁from ▁ 9 0   Hz ▁( O cul us ▁R ift ▁and ▁HT C ▁V ive ) ▁to ▁ 1 2 0   Hz ▁( Play Station ▁V R ). ▁ ▁The ▁graphics ▁processing ▁unit ▁( G PU ) ▁also ▁needs ▁to ▁be ▁powerful ▁enough ▁to ▁render ▁the ▁required ▁amount ▁of ▁frames . ▁O cul us ▁c ited ▁the ▁limited ▁processing ▁power ▁of ▁X box ▁One ▁and ▁Play Station ▁ 4 ▁as ▁the ▁reason ▁why ▁they ▁are ▁target ing ▁the ▁PC ▁g aming