Good question. These statement applies to patients who have no to very minor eye issues, meaning healthy people under age 40 who have refractive errors of ~1D (ideally less,) who have never been diagnosed with eye disease, who have no family history of eye disease, and who have good vision (that they are happy with.) It sounds like you probably have a refractive error of >6D, in which case yearly dilated exams are good practice.

Re: inaccuracies, what I am referring to is the air puff test. The air puff test is a very crude measurement of eye pressure (aka intraocular pressure, or IOP.) The gold standard is Goldman Applanation, which involves putting yellow fluorescein drops in your eye and then using the applanation tip and a blue light to assess IOP.

More on Goldman Applanation here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2206330/

Hope this helps!