What Is the Normal Intraocular Pressure for Glaucoma?
Mar 05, 2022
Source: Cainiu Health
Dr. Cui Xin
Introduction
For glaucoma patients, intraocular pressure (IOP) between 10–21 mmHg is considered normal. Glaucoma is a group of disorders characterized by optic nerve atrophy and visual field defects; the primary risk factor is pathologically elevated intraocular pressure. Pathological IOP can damage intraocular tissues—particularly the optic nerve.
Glaucoma is a group of disorders characterized by optic nerve atrophy and cupping, visual field defects, and decreased vision. Pathologically elevated intraocular pressure (IOP) and insufficient blood supply to the optic nerve are primary risk factors in its development. Additionally, individual susceptibility—i.e., the optic nerve’s tolerance to mechanical stress—also influences glaucoma onset and progression. So, what constitutes a “normal” IOP in glaucoma? The following addresses this question.
What Is a Normal Intraocular Pressure in Glaucoma?
In patients with glaucoma, an IOP between 10 and 21 mmHg is generally considered within the normal range. Glaucoma is a group of diseases sharing common features—including optic nerve atrophy and visual field loss—with pathologically elevated IOP being the principal risk factor. Such pathological elevation can damage intraocular tissues, especially the optic nerve. “Pathological IOP” refers specifically to pressure exceeding the tolerance threshold of ocular tissues—particularly the retina and optic nerve—thereby causing structural or functional damage.
In most cases, glaucoma is associated with elevated IOP and consequent damage to ocular structures—especially the optic nerve. Exceptions exist, however. One such exception is ocular hypertension: persistently elevated IOP (>21 mmHg) without evidence of aqueous outflow obstruction or optic nerve damage. Another is normal-tension glaucoma: typical glaucomatous optic nerve damage occurring despite consistently normal IOP (≤21 mmHg).
The above outlines what constitutes a normal IOP in glaucoma. We hope this information is helpful to you.
