The cavities and chambers of the eye

presbyopia

aka "hyperopia/lazy eye"; is a condition in which the lens is unable to accomodate (need convexed lenses)

tonometer

an instrument used in measuring the pressure in the anterior cavity of the eye

refraction

bending of light rays by the cornea and lens

positioning of the eyeballs

both are directed on the same object at the same time, each eye is controlled by 6 extrinsic muscles

adjustment of pupil size

controlled by muscle layers of the iris which allow more or less light to enter teh eyeball

anterior cavity

is divided into anterior and posterior chambers; maintains the pressure of the anterior eye

anterior chamber

is separated from the posterior chamber by the iris

posterior cavity

lies behind the lens, inside the eye; also called the "vitrous body" which maintain the shape of the eyeball and the intraocular pressure

myopia

means over convexing of thte lens (need concave lenses)

emmetrophic

normal accomodation

13-20mm

normal range for intraocular pressure

iridectomy

surgical removal of the iris

canal of sclemm

the area where the sclera and the cornea meet

accomodation of the lens

the curving of the lens

aqueous humor

watery fluid in the front of the eye (the anterior chamber of the anterior cavity)

optic chiasma

where the right and left optic nerves connect with each other