FYI, the air puff test can often be several points higher than the blue light IOP test if your cornea is thicker than average.
That is always the case for me, the air puff screening test usually gets 19-20 for me, but the blue light test the same day results are 15-16.
Your understanding is fragmentary but the subject is extremely complicated and I can give only basic information. First you should be under the care of an Eye MD ophthalmologist not a non MD Optometrist. Next glaucoma is not one disease but a large group of different types of glaucoma. The pressure in the eye IOP varies from hour to hour like blood pressure and blood sugar. Who has glaucoma and who needs treatment is based on an Eye MD’s assessment of these factors: age, family history, corneal thickness, depth of anterior chamber, cup/disk ration, visual field test, nerve fiber layer thickness, refractive error, patient understanding and reliability. Some glaucoma gets worse with age some get better. the incidence of glaucoma increases with age.