Chapter 16 Ophthalmic Surgery

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Anterior Cavity

Anterior Chamber Posterior Chamber Aqueous Humor

What do cones provide?

Cones provide Color and Sharpness

What is the Posterior Chamber filled with?

Filled with a gelatin called Vitreous Humor

The Iris

Is perforated at the center by the Pupil, which allows for the transmission of light into the eye

Where is the Crystalline Lens located?

It is behind the pupil

What does the secondary layer of the retina consist of?

Photoreceptors=Rods and Cones

what are retinal receiving units?

Rods and Cones

What do Rods provide?

Rods provide Shapes and Grays

The ORBIT is made of 7 bones

Superior Maxillary Bone aka Zygomatic Frontal Bone Sphenoid bone Ethmoid bone Lacrimal bone Palate

What makes up the MIDDLE TUNIC of the eye?

The Choroid, Ciliary Body and Iris

What type of muscle is the Ciliary body?

The Ciliary body is an INTRINSIC muscle

What does the Globe consist of?

The Conjunctiva The choroid The retina the sclera the ciliary body the crystalline lens the cornea the iris

What is the Crystalline lens encircled by?

The Crystalline lens is encircled by the Ciliary Body, which slightly overlaps its margin

What is the eye?

The eye is the sensory organ of sight

What is the aqueous humor?

The fluid that fills the Anterior Chamber

What is the function of the ciliary body?

The function is to alter the shape of the Crystalline lens

What is the main function of the eye?

The main function of the eye is to convert environmental light energy into bioelectrical energy and to relay the information to the brain for processing.

What is the Iris perforated by at the center?

The pupil

What do the Sclera and Cornea form?

They form the External Tunic (outermost tunic)

Vitreous humor

a gelatin

diathermy therm=heat

a probe that uses heat to coagulate or destroy tissue

superior maxillary bone

aka zygomatic

Posterior Chamber

bound by Ciliary Body, Retina and Lens

Anterior Chamber

bound by Iris and Cornea

lacrimal canal

convey the fluid from the eye to the lacrimal sac

nasolacrimal duct

convey the fluid from the lacrimal sac to the inferior meatus in the nose

excretory ducts

convey the fluid to the surface of the eye

movable muscles

extrinsic muscles

Trigeminal Nerve

fifth cranial nerve

lacrimal sac

is a dilated segment of the nasal duct

The Choroid

is a thin highly vascular membrane that makes up the posterior 5/6 of the eye

The Ciliary body

is similar to the Choroid but contains larger vessels

The Globe

is the eyeball in its entirety

Aqueous Humor

is the fluid that fills the Anterior Chamber

The Conjunctiva

is the mucous membrane covering the eye

Lacrimal System consists of

lacrimal gland excretory ducts lacrimal canal lacrimal sac nasolacrimal duct

O.S.

left eye oculus sinister

What is the RETINA?

makes up the INNER tunic and is the delicate nervous membrane on which images are received

If your colorblind you have?

no cones

Sclera

opaque-forms 5/6 of the globe

O.D.

right eye oculus dexter

superior oblique

rotates downward and away from midline

inferior oblique

rotates upward and away from midline

lacrimal gland

secrete the tears that keep the conjunctiva moist.

what are the two hardest extrinsic muscles to understand?

superior oblique & inferior oblique

there are 6 extrinsic muscles

superior rectus inferior rectus medial rectus lateral rectus superior oblique inferior oblique

extrinsic muscles

the extrinsic muscles of the eye come from the bones of the orbit and are movable?

where is the lacrimal gland located?

the lacrimal gland is located within the upper eyelid near the outer angle of the orbit, on the inner side of the external angular process of the frontal bone.

Retro-bulbar retro=behind

the location behind the globe of the eye

what does Iris mean?

the rainbow

Where do the extrinsic muscles come from?

they come from the bones of the orbit

The Sclera and Cornea

they form the External Tunic (outermost tunic)

accommodation

to focus

Cornea

transparent-forms 1/6 of the globe

Cryotherapy cryo=cold

utilizing cold for treatment


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