Ophthalmic Imaging and Photography Flashcards

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

Answer: Indocyanine green angiography

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

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

Answer: Subretinal fluid

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

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

Answer: Use a shorter flash duration

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

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

Answer: ANSI Z80.36 laser safety standards

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

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

Answer: Ellipsoidal mirror scanning

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

Which artifact in OCT imaging appears as a bright vertical line caused by a highly reflective surface on the lens or cornea?

Answer: Specular reflection artifact

Specular reflection artifacts appear as bright vertical streaks when highly reflective surfaces (e.g., IOL, cornea) saturate the detector.

During fluorescein angiography, the venous phase typically begins approximately how many seconds after dye injection?

Answer: 10–15 seconds

The venous phase of fluorescein angiography typically begins 10–15 seconds after antecubital injection in a healthy patient.