COT - Certified Ophthalmic Technician Ophthalmic Imaging and Photography Questions and Answers

Question 1

A patient undergoing fluorescein angiography begins to show dye filling the retinal arterioles approximately one to two seconds after the choroidal flush. Which phase of the angiogram is occurring?

Accepted Answer

Arterial Phase

Answer

Choroidal Phase

Answer

Venous Phase

Answer

Late Phase

Question 2

When performing fundus photography on a patient with small pupils, a bright, orange-colored crescent appears at the edge of the image. What is the most likely cause of this artifact?

Accepted Answer

Illumination beam reflecting off the iris

Answer

Dust on the camera lens

Answer

Corneal opacification

Answer

Incorrect camera-to-eye distance

Question 3

A technician is reviewing a corneal topography map to assist in fitting a patient for rigid gas-permeable (RGP) contact lenses. The axial map displays a localized area with predominantly red and orange colors, surrounded by green. How should the technician interpret this finding?

Accepted Answer

A steep area of the cornea

Answer

An area of corneal thinning

Answer

A flat region of the cornea

Answer

An area of corneal scarring

Question 4

Which of the following imaging modalities provides a cross-sectional, high-resolution view of the retinal layers, making it invaluable for detecting and monitoring conditions like macular edema and vitreomacular traction?

Accepted Answer

Optical Coherence Tomography (OCT)

Answer

Fundus Autofluorescence (FAF)

Answer

B-scan Ultrasonography

Answer

Slit-lamp Photography

Question 5

While acquiring an Optical Coherence Tomography (OCT) scan of the macula, the technician notes a low Signal Strength (SS) value and observes significant motion artifacts and poor delineation of the retinal layers. Which action is most appropriate to improve the scan quality?

Accepted Answer

Re-align the patient, coach them to fixate steadily, and re-scan.

Answer

Increase the room lighting to constrict the pupil.

Answer

Proceed with the scan as is, since the software will correct it.

Answer

Switch to a fundus photography camera instead.

Question 6

During fundus photography, the technician notices a persistent, well-defined dark spot that appears in the same location on every image, regardless of patient position or focus. This artifact is most likely caused by:

Accepted Answer

A smudge or debris on the camera's internal lens or sensor

Answer

A floater in the patient's vitreous

Answer

An eyelash in the optical pathway

Answer

A corneal foreign body

A patient undergoing fluorescein angiography begins to show dye filling the retinal arterioles approximately one to two seconds after the choroidal flush.Which phase of the angiogram is occurring?

A patient undergoing fluorescein angiography begins to show dye filling the retinal arterioles approximately one to two seconds after the choroidal flush.
Which phase of the angiogram is occurring?