Although the MOSFET is a four-terminal device with source (S), gate (G), drain (D), and body (B) terminals, the body (or substrate) of the MOSFET is often connected to the source terminal, making it a three-terminal device like other field-effect transistors.n the case of an n-type switch, the body is connected to the most negative supply (usually GND) and the gate is used as the switch control. Whenever the gate voltage exceeds the source voltage by at least a threshold voltage, the MOSFET conducts. The higher the voltage, the more the MOSFET can conduct.
Causes of Glaucoma. Glaucoma causes include elevated eye pressure (called intraocular pressure or IOP) due to the eyeâs inability to drain fluid efficiently. A clear fluid called aqueous humor circulates inside the front portion of our eyes.
Factors that cause or are associated with ocular hypertension are virtually the same as the causes of glaucoma. These include: 1  Excessive aqueous production. 2  The aqueous (or aqueous humor) is a clear fluid that is produced in the eye by the ciliary body, a structure located behind the iris.3  The aqueous flows through the pupil and fills the anterior chamber of the eye, which is the space between the iris and the cornea. If the aqueous drains too slowly from the eye, disrupting the normal balance of production and drainage of the eye's clear fluid, this too will cause high eye pressure. 2  Certain medications can have the side effect of causing ocular hypertension in certain individuals.