The aim of this series is to use high quality video to take the registrant through the process of data capture using an OCT.
First watch the video below, consider the questions raised and then complete the associated multiple choice questions to gain your CET point.
Here are some further reference resources that you may find useful when considering the questions:
- A good overview of the subject.
Lin, SC, Singh, K, Jampel, HD et al. Ophthalmic Technology Assessment: Optic Nerve Head and Retinal Nerve Fiber Analysis. A Report by the American Academy of Ophthalmology, Ophthalmology 2007;114;1937-1949
- A useful paper looking at the influence of peripapillary atrophy on analysis of the disc by OCT.
Edward Lai, Gadi Wollstein, Lori Lyn Price, MS, Lelia A. Paunescu, Paul C. Stark, James G. Fujimoto, and Joel S. Schuman. Optical Coherence Tomography Disc Assessment in Optic Nerves With Peripapillary Atrophy. Ophthalmic Surg Lasers Imaging. 2003; 34(6): 498–504.
- A general text in the area, with a good discussion of disc capture and analysis.
Schulman J S et al (editors). Optical coherence tomography of ocular diseases. Slack Publications
Model answers
Correct answer is in bold italic
1 Which of the following elements found during the history is not an established risk factor for the suspected disease?
A Intraocular pressures
B Her refractive error
C Family history
D Age
2 Which of the following statements regarding the fields assessment of this patient is true?
A Data from an unreliable witness is acceptable as the process is automated
B It is possible to record full fields even with retinal nerve fibre layer compromise
C Fields assessment is not necessary if you have an OCT
D Defects revealed by an OCT are indicated at the same point of disease progression
3 Which of the following statements about the retinal nerve fibre layer profile chart is false?
A It has a double hump in a normal patient
B Peaks are expected at inferotemporal and superotemporal regions
C Initial glaucomatous progression would be shown as depression of the central trough on the chart
D The profile may be matched against a database to aid interpretation
4 What might a clearly defined band across the posterior pole analysis map indicate?
A Segmentation error
B Localised thinning
C Area of opacification
D Area of swelling
5 What is the cup to disc ratio difference between the eyes of this patient?
A 0.1
B 0.2
C 0.3
D 0.4
6 Which of the following best describes the apparent notch seen on this patient’s left eye?
A There is no notch
B Area of neuroretinal rim loss superiorly
C Area of localised depression in the inferior ‘peak’ on the RNFL profile plot
D Overall enlargement of the cup