Intraocular Pressure

Intraocular pressure (IOP) refers to the fluid pressure inside the eyeball. This pressure is maintained by the balance between the production and drainage of aqueous humor, a fluid that fills the anterior chamber of the eye. IOP is an important parameter in ophthalmology as it can provide insights into several ocular conditions such as glaucoma, a group of diseases that can cause permanent blindness if left untreated. Measurements of IOP are usually performed using a tonometer, an instrument that applies a force to the cornea to deform it slightly and then measures the resistance of the cornea to this force. Normal IOP ranges between 10-21 mmHg, however, this can vary depending on age, time of day, and certain diseases or conditions. Increased IOP, known as ocular hypertension, can lead to optic nerve damage and progressive vision loss. In contrast, decreased IOP can be a sign of anterior segment ischemia or ciliary body dysfunction. IOP is also an important factor to consider in the management of certain ocular conditions. For example, in cases of glaucoma, it is important to lower IOP to prevent further optic nerve damage. This can be achieved through the use of topical or systemic medications, laser therapies, or surgery. Overall, understanding and monitoring IOP is crucial for maintaining healthy eyes and preventing vision loss.

From: Journal of Ophthalmic Science

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Intraocular Pressure

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