Essay On Aqueous Humour
INTRODUCTION
Aqueous humour and Vitreous humour are substances that play a big role in maintaining the globe. They are gel like fluids inside the eye which help it maintain its shape, which plays an important role in overall eye health.
AQUEOUS HUMOUR
Aqueous humour is a watery fluid between the cornea and crystalline lens. It is secreted from ciliary epithelium , a structure supporting the lens. It has the same relationship to blood as lymph elsewhere in the body, thus considered by many as the lymph of the eye.
Aqueous humour is located in the anterior and posterior chambers of the eye , which is the space between the lens and the cornea. Aqueous humour must not be confused with vitreous humour , which is contained within larger
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>Ciliary body: Extends 6mm from the scleral spur and posterior pigment epithelium of the iris anteriorly to the retina and choroid at the ora serrata posteriorly.
CLINICAL SIGNIFICANCE
Glaucoma usually affects the optic nerve. It occurs when the pressure of the fluid present in the eye increases. The high intraocular pressure if not treated In time, compresses the cells of the optic nerve, thereby causing their death. This condition is referred to as optic nerve atrophy. Glaucoma tends to be inherited and may not show up until later in life. An important risk factor is increased intraocular pressure (pressure within the eye) either through increased production or decreased outflow of aqueous humour. Increased resistance to outflow of aqueous humour may occur due to an abnormal trabecular meshwork or to obliteration of meshwork due to injury or disease of the iris. However , increased intraocular pressure is neither sufficient nor necessary for development of primary open angle glaucoma ,although it is the major risk factor. Uncontrolled glaucoma typically leads to visual field loss and ultimately blindness.
TYPES OF
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