No. Not all increased eye pressure results in glaucoma. Ocular hypertension is considered a glaucoma suspect and is followed until progressive optic nerve damage is detected, which can be a different pressure for different patients. Various ethnicities define elevated eye pressure with different cutoffs.
No. All human eyes have a 'pressure' within them called the intraocular pressure. This pressure can be measured with a device called a tonometer. When the number goes near or above 20, usually a diagnosis of glaucoma is considered. This exam is usually performed by an opthalomologist. If you are contemplating this for yourself, you should seek one out.