COT Ophthalmic Imaging and Photography 2

Question 1

Which imaging modality uses infrared light to image the choroid below the retinal pigment epithelium?

Accepted Answer

Indocyanine green angiography

Answer

Indocyanine green (ICG) angiography uses infrared wavelengths that penetrate the RPE, making it ideal for imaging choroidal vasculature.

Question 2

On optical coherence tomography, a hyporeflective (dark) space beneath the neurosensory retina is most consistent with:

Accepted Answer

Subretinal fluid

Answer

Subretinal fluid appears as a hyporeflective (optically empty) space between the neurosensory retina and the RPE on OCT.

Question 3

A patient with nystagmus is scheduled for fundus photography. Which technique best compensates for uncontrolled eye movement?

Accepted Answer

Use a shorter flash duration

Answer

A shorter flash duration (high-speed flash) freezes eye movement and reduces motion blur in patients with nystagmus.

Question 4

The safe maximum laser power for scanning laser ophthalmoscopy imaging is governed primarily by:

Accepted Answer

ANSI Z80.36 laser safety standards

Answer

ANSI Z80.36 establishes the safety standards for ophthalmic instruments including laser exposure limits for SLO devices.

Question 5

In wide-field retinal imaging (e.g., Optos), the peripheral retina is captured using which optical principle?

Accepted Answer

Ellipsoidal mirror scanning

Answer

Wide-field systems like Optos use an ellipsoidal mirror to redirect the scanning laser beam across up to 200° of the retina.

COT - Certified Ophthalmic Technician Practice Test