The eye has two main areas which are filled with different substances. The anterior segment (front) which constitutes about 20% of the area is filled with a clear watery fluid know as the aqueous humor. It lies between the cornea and the front surface of the lens. The posterior segment (back) which accounts for the remaining 80% of the internal area of the eye is filled with a clear gelatinous substance known as the vitreous humor. It lies between the back surface of the lens and the retina. Normal Eye Pressure The pressure within the eye is known as the intraocular pressure (IOP). It varies between 12 mmHg and 20 mmHg with an average pressure of 15 mmHg. The fluid that constitutes the aqueous humor is constantly being produced and drained in the eye. The ciliary body secretes this fluid into the posterior chamber of the anterior segment of the eye, between the front of the lens and back of the iris as explained under the human eye. The fluid then flows through the pupil to the anterior chamber where it is drained by the trabecular meshwork and then the Schlemm’s canal. This is a small drainage point that lies … Continue reading Glaucoma (High Eye Pressure) Types, Causes, Symptoms