Test 25

1. In which of the following might you use different plus adds for near 
    in each eye:

a. unilateral Horners

b. unilateral Adies

c. Argyll-Robertson pupils, 

d. Unilateral aphakia

e. Anisometropia
 

Answer
a. F   b.T  c.F   d.T   e.F
Different reading adds are used if there is a different
in accommodation and this occurs in unilateral aphakia, unilateral psuedophakia and Adie's pupil.
 

2. The following are true about excimer laser:

a. the laser is derived from a halogenated diatomic 
    molecules

b. it can be used efficiently in place of scalpel during 
    radial keratometry

c. is  made up of far-ultraviolet wavelength

d. it causes photochemical reaction

e. the cornea is flattened to treat myopia

Answer
a.T   b.F  c.F   d.T   e.T
Excimer is used in photorefractive surgery and is derived from argon fluoride molecules. Excimer laser measures 193nm.

3. Conditions that can lead to bilateral centro-caecal scotoma
    include:
 

a. chloroquine

b. vitamin B12 deficiency

c. amiodarone

d. ethambutol

e. Strachan's syndrome

Answer
a.F   b.T   c.T   d.T   e.T
Chloroquine causes maculopathy.
Strachan's syndrome refers to endemic tropical neuropathies which may be related to malnutrition. Optic neuropathy is common.

4. The following are true about amblyopia

a. neutral density filter decreases the visual acuity

b. reading of single letter is better than a line of letters

c. strabismus is always present

d. it is commoner in hypermetropia than myopia

e. stereoacuity is always reduced
 

Answer
a.T    b.T   c.F   d.T   e.T
Crowding phenomenon occurs in amblyopia ie. reading of single letter is better than a line of letters. Strabismus may not be present in patients with anisometropicstrabismus. Stereoacuity is related to binocular vision and is decreased in amblyopia.

5. Conditions that are typically associated with blue-yellow
    deficiency include:

a. diabetic retinopathy

b. cone dystrophy

c. glaucoma

d. retinitis pigmentosa

e. papilloedema

Answer
a.T   b.F  c.T   d.T   e.T
Cone dystrophy is associated with red-green deficiency.

 

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