Download Vision Lab Handout

Name: _________________________________ Date:_____________
Lab Handout – The Eye
Match the name to its description/function
A.
B.
C.
D.
E.
F.
G.
H.
I.
aqueous humor
cataract
chalazion
choroid
ciliary gland
cones
conjunctiva
cornea
fovea centralis
J.
K.
L.
M.
N.
iris
lacrimal fluid
lacrimal gland
lens
meibomian or
tarsal gland
O. nasolacrimal duct
P. optic disk
Q. optic nerve
R. palpebra
S. pupil
T. retina
U. rods
V. sclera
W. sty
X. suspensory
ligaments
Y. vitreous humor
_____ "white" of eye - tough outer coat that extends all around eye
_____ “blind spot” – where optic nerve leaves the eyeball
_____ blood rich middle layer that is darkly pigmented to prevent light scattering
_____ carries sight impulses to brain
_____ contains ciliary body muscles that adjust shape of lens as necessary to focus
_____ contains only cones – site of greatest visual acuity
_____ dilute salt solution that contains antibodies & lysozyme
_____ eyelids
_____ focuses light on retina for visual clarity
_____ Gel like substance that holds shape of eyeball – located between lens & retina
_____ Clouding & hardening of the lens – can be treated surgically
_____ inflammation of the ciliary gland
_____ inflammation of the tarsal gland
_____ innermost layer that contains photoreceptors - "screen" of eye
_____ produces oil to lubricate eye
_____ opening through which light passes to enter the inner part of eye
_____ Pigmented muscle fibers that regulates light entering eye
_____ produces sweat (watery fluid)
_____ produces tears to wash surface of eye
_____ responsible for color vision
_____ responsible for gray tone vision
_____ thin moist membrane that lines eyelids & connects to surface of eye
_____ transparent layer in front of lens - lets light in- often transplanted
_____ Watery fluid that provides nutrients for lens & cornea – located between lens & cornea
_____ Empties tears into nasal cavity
Match the letters on the diagrams to the parts below
_____
_____
_____
_____
_____
aqueous humor
choroid
ciliary body
cornea
fovea centralis
_____
_____
_____
_____
_____
iris
lens
optic disc
optic nerve
pupil
_____ retina
_____ sclera
_____ suspensory
ligament
_____ vitreous humor
Match the muscles to their function
a. superior oblique
d. medial rectus
b. inferior oblique
e. superior rectus
c. lateral rectus
f. inferior rectus
_____ moves eye laterally
_____ Moves eye medially
_____ Depresses eye and turns it laterally
_____ Elevates eye and turns it laterally
_____ Elevates eye
_____ Depresses eye
___________________________________________________________________________
Match the eye muscles to the diagram
_____ Superior oblique
_____ Medial rectus
_____ Inferior oblique
_____ Superior rectus
_____ Lateral rectus
_____ Inferior rectus
Follow-up Questions:
1. ___________________________ is the sharpness of the perceived visual image and is
often evaluated in clinical situations with the _____________________ eye test.
2. A person with 20-100 vision can see an object at ____________________feet where a
normal person can see that object at _______________________feet.
3. When accommodating, the pupil and the ______________________ may change shape.
4. Cones are involved in __________________________vision. (bright-light/dim-light)
5. Rods are involved in ____________________________vision. (bright-light/dim-light)
6. Color blindness usually results from:
7. Explain why there is a blind spot in your vision.
8. Colorblindness is a recessive sex-linked disorder present on the X chromosome. Explain
why more men suffer from colorblindness than women.
9. How was your reaction time different from your dominant and non-dominant hand?
Hypothesize why this happened.
10. Name one voluntary muscle of the eye and name one involuntary muscle of the eye.
What does each do?
a. Voluntary:_____________________________________________
i. Function: ___________________________________________________
b. Involuntary: ____________________________________________
i. Function: __________________________________________________
.
Eye.
1. List the refractory structures of the eye.
2. Which is the only structure that can change its refractory power? ________________
Vision
1. Presbyopia
a. Define:
b. Cause:
2. Define Emmetropia
3. Astigmatism
a. Define:
b. Cause:
4. Complete the chart
Myopia
One word
definition
Explain
Eyeball is too:
Hyperopia
Lens is too:
Cornea is too:
Corrective lens
5. Why do you get a headache when you’ve been reading for a long time?
6. Know these disorders for quiz.
o Chalazion
o Conjunctivitis
o Sty
o Colorblindness
7. Complete the chart
Structure relaxed
Distance Vision
Near Vision
o Cataract
o glaucoma
Structure tightened
Light refraction
(Increase or
decrease)