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I suggest that you keep the appointment. It is necessary that the eye pressures are rechecked to confirm that persistent increase in the eye pressure. If the eye pressure remain elevated, further testing need to be performed including Pachymetry
(corneal thickness), Humphrey visual field, OCT, and gonioscopy
to check for the adequate opening of the drainage channel in the eye. If after these testings, you are determined to be a glaucoma
suspect - meaning the you have high eye pressure and/or other factors, it may become necessary to monitor your eye and/or give you a trial of eye pressure drop to decrease the eye pressure, as high eye pressure can cause progressive damage to the optic nerve (which helps you see). Any damaged can not be reversed. So, prevention by keeping the eye pressure within average (less the 21) becomes the goal.
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Please note that this answer is for information only. It cannot be substituted for the visit to or the recommendation of your doctor.