OCANZ Written Exam | 100% Correct
Answers | Verified | Latest 2024 Version
What is Stargardt disease - ✔✔is the most common form of inherited juvenile macular degeneration.
Wife calls requesting details on husbands eye test. Do you: get verbal consent, refuse call, get written
consent - ✔✔get written consent
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,
The main cause of amblyopia in a child: anisometropia >2, accommodative eso, intermittent exo -
✔✔anisometropia >2,
Which of the following can match Illuminant c: Incandescent, Halogen, Flourescent, sodium -
✔✔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 - ✔✔d/ Gonio
,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)
Which causes a red defect- red cap test: optic neuritis, Amd - ✔✔Optic neuritis
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)
Is gonio indicated with Hyphaema? - ✔✔no
What is prenticies rule? - ✔✔P (prism dioptres =c (decentration in cm) x F(power of lens in dioptres)
What is the most preventable cause of AMD? - ✔✔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 - ✔✔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 - ✔✔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? - ✔✔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
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
63 year old elderly woman with purple loss in vision for past 3 weeks, she is experiencing jaw
claudication.
a) What is your diagnosis?
b)What is your systemic and optometric management?
c) Patients prognosis? - ✔✔GCA
Answers | Verified | Latest 2024 Version
What is Stargardt disease - ✔✔is the most common form of inherited juvenile macular degeneration.
Wife calls requesting details on husbands eye test. Do you: get verbal consent, refuse call, get written
consent - ✔✔get written consent
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,
The main cause of amblyopia in a child: anisometropia >2, accommodative eso, intermittent exo -
✔✔anisometropia >2,
Which of the following can match Illuminant c: Incandescent, Halogen, Flourescent, sodium -
✔✔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 - ✔✔d/ Gonio
,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)
Which causes a red defect- red cap test: optic neuritis, Amd - ✔✔Optic neuritis
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)
Is gonio indicated with Hyphaema? - ✔✔no
What is prenticies rule? - ✔✔P (prism dioptres =c (decentration in cm) x F(power of lens in dioptres)
What is the most preventable cause of AMD? - ✔✔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 - ✔✔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 - ✔✔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? - ✔✔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
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
63 year old elderly woman with purple loss in vision for past 3 weeks, she is experiencing jaw
claudication.
a) What is your diagnosis?
b)What is your systemic and optometric management?
c) Patients prognosis? - ✔✔GCA
