Which imaging modality was used to assess the canine eye in the slides?

• A. Interferometry
• B. Slit-lamp biomicroscopy
• C. Noncontact infrared meibography
• D. Fluorescein staining

Answer: (A)

Interferometry works by analyzing how light waves interfere with each other to reveal extremely fine optical surface details. In the canine eye, this technique can produce fringe patterns or quantitative maps that reflect the corneal surface topography, thickness, and tear film properties with high precision. If the slides show this kind of fringe pattern or detailed surface data rather than a standard color photograph or dye pattern, it indicates an interferometric imaging approach.

Slit-lamp biomicroscopy is a clinical examination method that provides magnified light views of ocular structures but does not generate the interference-based data or fringe maps characteristic of interferometry. Noncontact infrared meibography images the eyelid glands and is used to assess meibomian gland structure, not the corneal surface itself. Fluorescein staining highlights epithelial defects or corneal ulcers by dye uptake, again not providing the surface topography data interferometry offers. So the imaging modality depicted in the slides would be interferometry, given its ability to reveal detailed corneal surface and tear film characteristics beyond what the other methods show.