I'd like to know the minimum and maximum eye pressure. at what pressure is glaucoma indicated?

There is none: For someone with absolutely no eye problems, normal pressure is thought to be between 6 and 21, but if you are suspected to have glaucoma, there is no normal. That's because everyone's optic nerves have different threshholds at what point pressure damages their eyes. Some live at 25 their whole lives with no glaucoma; others have very bad glaucoma at pressures of 12. Everyone's different.

0-70: Minimum 0 mmhg when the eye is completely collapsed and too much fluid is exiting the eye for the amount made. Maximum somewhere around 70 mmhg since eventually the eye can't make any more fluid (ischemic ciliary body). With repeated injections, you may be able to make the eye pressure higher. Glaucoma is when the pressure causes retinal ganglion cell loss (a different number for everyone).

Several ranges: The generally quoted "normal" eye pressure is 10-21. Glaucoma however is any pressure greater than the eye can withstand. There is a small group, low pressure glaucoma, in which vision is lost despite pressure in the normal range. Eye pressure can be almost any number from 0 to 75. All over 30 are treated and others are evaluated for the need for treatment.

Typical range: Simplifying this somewhat is to say that an average range of Intraocular pressure (IOP) is 10 to 21 mmHg. This assumes average corneal thickness. To state to you at what IOP does glaucoma develop, is very difficult at best. Sure, if the IOP is excessive especially if too long, optic nerve damage Will occur, whether this is 30, 40, 50 etc. The disease occurs when the optic nerve becomes sensitive.