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Thread: ocular physiology mcq

  1. #1
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    Smile ocular anatomy mcq

    1. The following are true about
    the conjunctiva:
    a. it is lined by squamous
    epithelium
    b. the superior fornix
    extends further from the
    limbus than the
    inferior limbus
    c. the bulbar conjunctiva
    and the Tenon's capsule
    are fused
    1mm from the limbus
    d. the highest concentration
    of goblet cells are found in
    the
    superonasal quadrant of
    the bulbar conjunctiva.
    e. most of the conjunctiva is
    supplied by the anterior
    ciliary
    arteries
    2.The following nodes receive
    direct lymphatic drainage from
    the eyelids:
    a. submental nodes
    b. parotid nodes
    c. preauricular nodes
    d. submandibular nodes
    e. sublingual nodes
    3. With regard to the glands
    found on the eyelids:
    a. the meibomian glands
    are found within the tarsal
    plate
    b. the glands of Moll are
    modified sweat gland
    c. there are more glands of
    Moll in the lower than the
    upper lids
    d. the glands of Zeis are
    modified sebaceous gland
    e. the glands of Zeis are
    opened into the ciliary
    follicles
    4. The following structures are
    anterior to the grey line:
    a. meibomian glands
    b. tarsal plate
    c. cilia
    d. orbicularis oculi
    e. glands of Moll
    5. The following are true about
    the blood supply to the eyelids:
    a. they receive branches of
    the lacrimal artery
    b. they receive branches of
    the ophthalmic artery
    c. the arterial arch runs
    anterior to the Muller's
    muscle
    d. the marginal arch runs 3
    mm from the free margin
    of the
    eyelids
    e. the peripheral arch is
    often absent inferiorly. Answers~1.Ttfff 2.Ftttf 3.All true 4.Ffttt 5.All true
    Last edited by ansh1011; 09-24-2009 at 09:28 AM.

  2. #2
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    Ocular physiology

    1. The following are true about
    the lens:
    a. the anterior capsule is 10
    times thicker than the
    posterior
    capsule
    b. the anterior surface has
    a greater radius of
    curvature than
    the posterior surface
    c. during accommodation
    the lens moves towards the
    cornea
    d. the lens is more effective
    in absorbing light with long
    than
    short wave-lengths
    e. the lens is supplied by
    the ophthalmic nerve
    2. The following are known to
    cause cataract:
    a. prozac
    b. simvastatin
    c. salicylic acid
    d. chlorpromazine
    e. PUVA
    3. The following are associated
    with cataract formation:
    a. dehydration
    b. smoking
    c. alcohol
    d. poor nutrition
    e. ultraviolet light.
    4. In the lens:
    a. the potassium
    concentration is higher than
    that of the
    sodium
    b. the majority of the lens
    protein are water soluble
    c. glutathione is increased
    in the presence of cataract
    d. production of fructose is
    increased in the presence
    of
    hyperglycaemia
    e. the osmolarity is higher
    than that of the aqueous
    5. The following are true about
    crystallins found in the lens:
    a. they are water soluble
    b. alpha crystallin is the
    most common
    c. gamma crystallin is the
    smallest crystallin
    d. beta crystallin has the
    largest mass
    e. gamma crystallin is found
    mainly in the nucleus
    6. The Pulfrich
    phenomenon:
    a. occurs in patients
    with bilateral
    macular
    degeneration
    b. occurs in optic
    neuritis
    c. refers to the
    perception of
    photopsia
    d. refers to the
    illusion of abnormal
    motion
    e. can occur with a
    swinging pendulum
    . 7. The following are
    true about the
    contrast sensitivity:
    a. Pelli-Robson
    chart tests the
    contrast sensitivity
    b. is a measure of
    the ratio of
    brightness to
    darkness
    c. a contrast of 1
    means that there is
    no contrast
    d. is highest at
    middle range
    frequencies
    e. is reduced in
    macular
    degeneration but
    not in cataract
    .8. The following are
    true:
    a. depth of
    perception only
    occurs in patients
    with
    normal visual
    acuities in both eye
    b. Hering's law
    states that
    increased
    innervation to an
    extraocular muscle
    is accompanied by a
    decrease
    in innervation to its
    antagonists.
    c. objects on the
    Panum's area fall
    on simultaneous
    areas of the retina
    d. objects outside of
    the Panum's area
    are perceived as
    double
    e. objects on the
    horopter are seen
    as single
    9. The following are
    yoke muscles:
    a. right medial
    rectus and left
    lateral rectus
    b. right inferior
    rectus and left
    superior rectus
    c. right superior
    rectus and left
    inferior oblique
    d. right superior
    oblique and left
    inferior rectus
    e. right inferior
    rectus and left
    inferior oblique
    .10. The following are
    true about fluorescein
    sodium:
    a. it is 60% bound
    to the plasma
    protein
    b. it leaks out of
    the choriocapillaris
    readily
    c. is excreted mainly
    by the kidney
    d. it is excited by
    green light
    e. it has a emission
    peak of 530nm

  3. #3
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    answers:1.bc 2.bde 3.all 4.all 5.ce 6.bde 7.abd 8.de 9.acd 10.bce

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    Hello Ansh,
    Thanks for your contribution to MedicalGeek.
    But make your post readable and attractive. Post with proper format, so users will like your posts.

  5. #5
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    thank u

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