There are devices to measure IOP, most used but kind of inaccurate with a small „air burst“ on your eye. There seem to be more accurate measurement methods but they involve „touching“ the eye.
well it can actually be bought for 700$ but yeah doctors are a thing.
also:
> Differences in pressure between the two eyes are often clinically significant, and potentially associated with certain types of glaucoma, as well as iritis or retinal detachment.