PA- lec, Eye Anatomy
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PA- lec, Eye Anatomy
What protects the eye
Boney orbital cavity
What does it mean when you say "the lid margins approximate completely"?
The eyelids close completely
Where do the upper lids cover when open
the top of the iris
What do the lower lids cover while open?
come to the limbus (border between cornea and sclera
Describe the Tarsal Plates
upper lateral part of lid
helps lid margins approximate completely
secrete lubricant so tears do not overflow
What are the 2 types of conjunctiva?
Palpebral- covers inner lids
bulbar- covers scleral
How do you describe the conjunctiva when they are healthy?
What is the red reflex?
Red light seen when using an opthalmoscope, light is bouncing off of the blood vessels
Where is the lacrimal Gland?
Superior and lateral to the eye
Describe the flow of tears
Produced by lacrimal gland > drain into PUNCTUM > down nasolacrimal duct > nose >nasopharynx
Name the 3 coats surrounding the eye
Retina (transparent vitrous body)
What parts of the eye can we see?
What is the Sclera?
White of eye
continuous with the cornea
Describe the cornea
helps bend light toward retina
sensitive to touch
Describe the Choroid
Dark, light does not reflect off of it
What is CN V
What is CN VII
reaction to touch sent to brain
What is the purpose of the iris?
to contract/dilate pupils with muscles
Describe the pupil
Should be round and regular
Parasympathetic-Constricts (CN III)
Describe the lens
bends to keep light focused on retina
Bulges for near objects
Thins for far away objects
posterior to cornea, anterior to iris/lens
has aqueous humor
delivers nutrients and drains metabolic waste
Amount of aqueous humor and resistance to outflow of humor from eye
What is Glaucoma?
Build up of intraoccular pressure
Describe the retina
visual receptive area
where vision is converted into nerve impulses
Optic disk, retinal vessels, macula
What can you see with an Opthalmoscope?
Describe the optic disk
fibers of retina converge to form optic nerve (CN II)
on nasal side of retina
Color from yellow/orange to pink
distinct outline on the temporal side
What is the physiological cup?
Middle of optic disk where blood vessels and veins enter/exit
What are the Retina vessels?
4 pairs of arteries/veins
thicker towards physiological cup
Arteries are brighter red and narrower than veins, arterial light reflex
Describe the macula
on temporal side
darker in color than rest of background
Has fovea Centralis-sharpest part of vision
What is the fovea centralis?
the sharpest part of vision
What is Conjugate movement of the eye?
The eyes moving together