Certainly, having different test results from different centres can be disconcerting to say the least. In most eye clinics, an automated pressure measuring device known as an air-puff tonometry is used as a quick screening tool to check for eye pressure levels.
In the event a raised eye pressure is found, another pressure measuring technique which uses a contact lens is employed as a means of crosscheck. The concern regarding high pressure is related to an important blinding eye condition known as glaucoma. Part of the aims of a LASIK suitability assessment include identifying and treating any eye pathologies prior to any LASIK treatment.
In order to have a piece of mind, it might be best to have your pressure rechecked by your surgeon via the contact lens method.