Test 14
1. In the measurement of the palpebral fissure:
a. in patients with malposition of the lower lid, MRD 
   (margin-reflex distance) gives a more accurate measurement
    of ptosis than the interpalpebral fissure

b. MRD is the distance between the upper eyelid margin and the 
    corneal light reflex in the primary gaze

c. ptosis is present if the MRD is less than 2 mm

d. the MRD is increased in facial nerve palsy

e. in normal persons, the upper lid is at the level of the limbus

2. In levator disinsertion, the following features are seen:
a. high skin crease

b. levator function less than 10 mm

c. frontalis over action

d. failure of the upper lid to relax on down-gaze

e. decreased ptosis on up-gaze


3. Features of congenital ptosis include:
a. absent or poor skin crease

b. lid lag on down-gaze

c. increased ptosis on up-gaze

d. limitation of up-gaze

e. reduced levator function.


4. Pseudoptosis occurs in:
a. hypotropia.

b. unilateral thyroid eye disease

c. unilateral high myopia.

d. myotonic dystrophy

e. myasthenia gravis

5. The following are true about the eyelids:
a. the lower eyelid is normally 1 mm below the limbus

b. the lower eyelid is retracted in Horner's syndrome

c. basal cell carcinoma affects the lower lids more commonly
    than the upper lid

d. the upper lid is more important than the lower lid in maintaining 
     the integrity of the cornea

e. the skin crease of the upper lid represents the insertion of the 
    levator muscle.

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