Outer Layers
What is the name for the “whites” of the eyes?
The Sclera
What does the ciliary body hold?
The lens
What is the macula responsible for?
Sharp focus and central vision
What 2 structures bend light?
Cornea and Lens
What is the physiology of eyelashes?
To keep dust and debris out of the eyes
What is the outermost part of the eye?
The Cornea
What is in the posterior cavity?
Vitreous humor (gelatinous)
Why don't we usually notice our “blind spot”?
The other eye accommodates
What is accommodation?
The eye’s ability to adjust for varying distances
What does the nasolacrimal duct do?
Collects tears and channels them to the nasal canal
What fills the anterior cavity?
Aqueous Humor
What does the lens allow us to do?
Focus our eyes on varying distances
What are 2 things rods help us to do?
See in dim light, peripheral vision
How many degrees is our visual field?
170 degrees
How many extrinsic muscles move the eye?
6 muscles
What structure secretes mucus to lubricate the eye?
Conjunctiva
What is the role of the choroid?
Prevent glare and bring nutrients to the inner eye
What are the 3 layers of the retina? (superficial to deep)
Photoreceptors, Bipolar Neurons, Ganglion cells
What 3 things change for accommodation?
Lens shape, pupil diameter, eye distance apart
Where is the lacrimal gland located?
Superior/Lateral to the eye
What structure and muscles dilate the pupil?
The radial muscles of the iris
What are 2 things the gelatinous material in the posterior cavity help with?
Hold the retina in place and maintain intraocular pressure
What are the 3 types of cones?
Blue, Green, Red
List the visual pathway to the brain starting at the optic nerve. (4 parts)
Optic nerve, optic chiasma, optic tract, occipital lobe
What do tears contain that clean the eyes?
Antibacterial enzymes (lysozyme)