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OCANZ WRITTEN EXAM 98 QUESTIONS AND VERIFIED ANSWERS LATEST UPDATE
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OCANZ WRITTEN EXAM 98 QUESTIONS AND VERIFIED ANSWERS LATEST UPDATE
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1. What is Stargardt disease: is the most common form of inherited juvenilemacular degeneration.
2. Wife calls requesting details on husbands eye test. Do you: get verbal
consent, refuse call, get written consent: get written consent
3. 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: c/ Discuss findings with GP
before prescribing Rx,
4. The main cause of amblyopia in a child: anisometropia >2,
accommodative eso, intermittent exo: anisometropia >2,
5. Which of the following can match Illuminant c: Incandescent, Halogen,
Flourescent, sodium: Fluorescent
,6. 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: d/ Gonio
7. What is Kolleners rule in relation to colour vision?: 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)
8. Which causes a red defect- red cap test: optic neuritis, Amd: Optic
neuritis 10. Lissamine green; what does it stain?: 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)
11. Is gonio indicated with Hyphaema?: no
12. What is prenticies rule?: P (prism dioptres =c (decentration in cm) x
F(power of lens in dioptres)
13. What is the most preventable cause of AMD?: Smoking
14. 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: a/ Train driver
15. 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: 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
16. Picture of GPC, differential diagnosis, treatment
Treatment method for GPC?: 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)
Manage lid margin disease
If sever - topical Mast cell stabalisers
17 Colour vision: What careers can you do if you have a defect?
What is the fail criterion for D15.
What test would you do to confirm ishihara?: Fail criterion is 2 or more
diagonal crossings
D15 can classify but not grade severity
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