OCANZ ACTUAL EXAM 2024 LATEST WITH QUESTIONS AND ANSWERS/GRADED A+
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Module
Ocanz exam
Institution
University Of South Africa
1
OCANZ ACTUAL EXAM 2024 LATEST WITH
QUESTIONS AND ANSWERS/GRADED A+
Diabetic recently diagnosed unstable. Refraction reveals significant myopic shift compared to last visit 12 months ago. Which is the most appropriate course of action:
a/ prescribe specs & report to GP b/ Refer ...
OCANZ ACTUAL EXAM 2024
LATEST WITH
QUESTIONS AND
ANSWERS/GRADED A+
Diabetic recently diagnosed unstable. Refraction reveals
significant myopic shift compared to last visit 12 months
ago. Which is the most appropriate course of action:
a/ prescribe specs & report to GP
b/ Refer to Ophthalmologist,
c/ Discuss findings with GP before prescribing Rx,
d/ Obtain info on current blood glucose levels - ANSWER c/
Discuss findings with GP before prescribing Rx,
The main cause of amblyopia in a child: anisometropia >2,
accommodative eso, intermittent exo - ANSWER
anisometropia >2,
Which of the following can match Illuminant c: Incandescent,
Halogen, Flourescent, sodium - ANSWER Fluorescent
25 years old enquiring her suitability for laser refractive
surgery. Which of the following is NOT essential pre-
operatively:
a/ Tonometry,
b/ Tear film stability
c/ pupil size,
d/ Gonio - ANSWER d/ Gonio
, 2
What is Kolleners rule in relation to colour vision? -
ANSWER outer retinal diseases and media changes result in
blue-yellow color defects
inner retina, optic nerve, visual pathway, and visual cortex
will result in red-green defects.
(increased susceptibility of S-cones and rods to ischaemia
and oxidative damage, although S-cone loss is more
noticeable due to their lower density and their higher
metabolic rate) (Kollners rule, retinal disease will give a
blue yellow defect and optic nerve disease will give a red
green defect but the exceptions are glaucoma which will
give a blue yellow defect and central cone degeneration
which will give a red green defect)
Which causes a red defect- red cap test: optic neuritis, Amd -
ANSWER Optic neuritis
Lissamine green; what does it stain? - ANSWER Lissamine
green stains dead and degenerate cells, yet does not stain
healthy epithelial cells.
(NaFl permeates into the intercellular space associated with
any epithelial cellular disruption)
Is gonio indicated with Hyphaema? - ANSWER no
What is prenticies rule? - ANSWER P (prism dioptres =c
(decentration in cm) x F(power of lens in dioptres)
, 3
What is the most preventable cause of AMD? - ANSWER
Smoking
15 years old attends eye examination, best Va's R6/6, L 6/24
(told ambloypic). Which occuptation should he NOT pursue:
a/ Train driver,
B/ construction worker,
c/ Electrician,
d/ Dentist - ANSWER a/ Train driver
RGP fit with lens riding high and bubbles underneath. What
is the bubbles underneath- name? What is the cause? How
would you change the fit? Rewrite the prescription, base
curve/power/diameter according to change in fit. 0.05 base
curve change the rx by 0.25, 0.5mm diam change etc...all the
rules of thumb - ANSWER DimpleVeil
RGP too steep - reduce total diameter, flatten
Change BOZR by 0.1mm then change power of 0.50D to keep
NaFL pattern?
Increase TD by 0.1mm then flatten BOZR by 0.05mm
Picture of GPC, differential diagnosis, treatment
Treatment method for GPC? - ANSWER improve lens hygeine
Increase lens replacement frequency
DD if possible
Reduce modulus of lens material (Swap to hydrogel lens, be
aware more difficult to handle)
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