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[InquilineKea]

Normal range is 10-20.

I'd like a conversion to units that are more physical.

[niner]

The eye is slightly pressurized; it's called the IntraOccular Pressure, or IOP. It looks like you have nothing to worry about. When the pressure gets too high, it is a major risk factor for Glaucoma, a disease in which the optic nerve is damaged and sight can be lost. After many years of borderline high IOP, I had an iridotomy, where a Neodymium YAG laser was used to blast a tiny hole in my iris so fluid pressure could eqalize. End of problem for me.

Those units are millimeters of mercury, which relate to a mercury manometer. One atmosphere of pressure will support a column of mercury 760mm high. One atm is about 14 psi, so 1mm Hg is 14/760 = 0.018 psi. A mm Hg is also called a "torr", a unit named after Evangelista Toricelli, the inventor of the barometer.