Fluctations of IOP as a predictive factor for glaucoma

I have not yet been diagnosed with glaucoma and am not on medications but have recently experienced a significant elevation of IOP from my normal range of 13-18 to about 20 in one eye after having my eyes dilated and 22 in the same eye on another occasion. I was told that so far I do not require any medication or surgical interventions for this fluctuation but need to be monitored prior to exercising and afterwards.