There is a constant pressure of the fluid that fills the eye (called intra-ocular pressure) which allows the eye to maintain its shape and function. In ocular hypertension, this pressure is above normal levels (NB Ocular hypertension is not related to raised blood pressure or hypertension and is not the pressure of blood within the vessels supplying the eye). Ocular hypertension may cause no problems in itself but it should be closely monitored because it can indicate the development of an eye problem, such as glaucoma.