Ocular Physiology - Eyelid

21 Questions | Total Attempts: 261

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Ocular Physiology - Eyelid - Quiz

Eyelids


Questions and Answers
  • 1. 
    What are the characteristics of a lid lesion that would cause you to refer to a specialist (not a general OMD)?  
  • 2. 
    Which of the following muscles is NOT involved in eyelid elevation? A. Levator palpebrae superioris B. Muller's muscle C. Frontalis muscle D. Orbicularis oculi
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 3. 
    Concerning yoked muscles: Hering's law of _______ innervation.
  • 4. 
    Concerning yoked muscles: Sherrington's law of _______ innervation.
  • 5. 
    Which of the following afferent pathways is not paired correctly? A. Trigeminal (CN V) - Corneal reflex B.  Auditiory ( CN VIII) - auditory and facial reflexes C. Optic (CN II) - Dazzle, glare and menace reflexes
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      All the above are paired correctly

  • 6. 
    Which of the following statements regarding the corneal reflex is FALSE? A. It has a latency of about 160 msec B. It is the last reflex lost under general anesthesia C. It remains in decorticate animals D. First reflex lost with cerebellar pontine angle tumor
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 7. 
    Which reflex can normal patients withhold? If a patient cannot withhold this reflex it is known as Myerson's sign. A. Corneal Reflex B. Facial Reflex C. Dazzle Reflex D. Glare Reflex
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 8. 
    Why is the "contact lens stare" significant? A. It shows that blinking is not affected by the concentration or excitation level B. It shows that the blink cycle for secretion, dispersal, evaporation and drainage of tears is not dynamic C. It shows that blink characteristics can be altered. D. It is an example of blink suppression
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 9. 
    Blink suppression affects: A. Low spatial frequency B. High temporal frequency C. Luminance information
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      All of the above

    • E. 

      None of the above

  • 10. 
    Which of the following statements does NOT apply to the palpebral fissure? A. Thyroid -associated orbitopathy is a common cause of increased fissure width. B. Is elliptical in children and already completely developed at birth. C. There is no difference b/t men and women D. Upper lid 1.5 - 2mm below superior limbus and lower lid at inferior limbus
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 11. 
    In reference to the palpebral fissure: which sign results from retraction of the upper lid as a result of excessive sympathetic stimulation of Muellers muscle? A. Von Graefe's sign B. Collier's sign C. Pseudo Von Graefe's sign
    • A. 

      A

    • B. 

      B

    • C. 

      C

  • 12. 
    In reference to the palpebral fissure: which sign is caused by an increased tonus of the levator? A. Von Graefe's sign B. Collier's sign C. Pseudo Von Graefe's sign
    • A. 

      A

    • B. 

      B

    • C. 

      C

  • 13. 
    In reference to the palpebral fissure: which sign occurs after recovery from a CN III paralysis? A. Von Graefe's sign B. Collier's sign C. Pseudo Von Graefe's sign
    • A. 

      A

    • B. 

      B

    • C. 

      C

  • 14. 
    What pathophysiology is commonly observed in CN VII nerve palsy, MG or trauma? A. Ectropion B. Entropion C. Bitot spot D. Ankyloblepharon
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 15. 
    Which of the following statements in regard to the Meibomian glands is FALSE? A. The glands are oriented parallel to the lid margin B. There are roughly 30 glands in each lid C. The oil is the top layer of the tear film that helps to prevent the evaporation of tears D. Each gland has one central duct on the lid margin
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 16. 
    Which of the following terms are paired incorrectly? A. Accessory lacrimal glands = Krause and Wolfring B. Acessory oil glands = Zeiss and Moll C. Internal hordeolum = inflammation/ blockage of the meibomian gland. D. Meibomitis = bilateral inflammation of the lid margins
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 17. 
    Finish the sentence: Blepharochalasis... A. Results in false positives for defects in superior visual field B. Is the result of repeated bouts of edema of the lid tissue C. Is commonly associated with weak superior rectus muscle D. Is the generalized narrowing of the palpebral fissure
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 18. 
    Which of the followingtypes of ptosis is not paired/defined with the proper fact: A. Mechanical - fat deposits and edema cause the levator to have difficulty elevating the lid B. Myogenic - the most common form is involutional C. Cicatrial - use of neostigmine results in paralysis of the LPS D. Neurogenic - CN III nerve or sympathetic lesion
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

    • E. 

      Two of the above

  • 19. 
    Which of the following would NOT be a suggested treatment for GPC? A. Steroids B. Vaso-constrictors/antihistamines C. Neostigmine D. MC stabilizers  
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 20. 
    Of the following choices, which is has the best prognosis? A. Squamous cell carcinoma B. Basal cell Carcinoma C. Malignant Melanoma
    • A. 

      A

    • B. 

      B

    • C. 

      C

  • 21. 
    The purpose of treatments for GPC is to suppress the immune response not eradicate it.
    • A. 

      True

    • B. 

      False

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