Chapter 16 Ophthalmic Surgery
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
