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