Test 150  (Ocular questions)

1. The following immunoglobulins are found in tear:

a. Ig A

b. Ig D

c. Ig M 

d. Ig G

e. Ig E
 

Answer
a.F   b.T   c.F   d.F   e.F
All immunoglobulins except Ig D are found in tear.

2. The following HLA typings are associated with dry eyes:

a. HLA-B27

b. HLA-A29

c. HLA-DR3

d. HLA-DR4

e. HLA-B51
 

Answer
a.F   b.F   c.T  d.T e.F
HLA-DR3 is associated with primary Sjogren's syndrome whereas HLA-DR4 is associated with secondary Sjogren's syndrome. 
HLA-B27 is associated with ankylosing spondylitis.
HLA-A29 is associated with birdshot choriodopathy.
HLA-B51 is associated with Behcet's disease.

3. The following are true about corneal sensation:

a. decreased corneal sensation is a cause of dry eye

b. corneal sensation decreases with age

c. photorefractive surgery decreases corneal sensation

d. topical b-blocker decreases corneal sensation

e. atropine decreases corneal sensation
 

Answera.T  b.T  c.T  d.T  e.T

4. The following are true:

a. the normal rate of blinking is 5 per minute

b. blinking spreads the lipid layer over the tear film

c. the tear film is stable for about 10 seconds
    in the majority of normal population

d. fluorescence decreases the stability of tear film

e. rupture of tear film at 6 seconds is diagnostic of 
    dry eye

Answer
a.F b.T  c.F  d.T  e.F
The normal rate of blinking is once every 5 seconds 
or 12 per minute. In normal population, the tear film 
is stable for between 15 and 34 seconds. However,
in 1% of normal population, the tear film may rupture at 6 seconds.

 

5. Increased tear osmolarity occurs in:

a. decreased corneal sensation

b. increased palpebral fissure width

c. meibomitis

d. punctal stenosis

e. ocular cicatricial pemphigoid
 

Answer
a.T   b.T  c.T  d.F  e.T
Increased tear osmolarity occurs in either decreased tear production (decreased corneal sensation or ocular cicatricial pemphigoid) or increased evaporation (meibomitis or increased palpebral fissure width)

 

More MCQs