Which of the following are the three principal types of ophthalmic imaging?

The correct answer identifies the three principal types of ophthalmic imaging as the slit-lamp, external imaging, and fundus imaging.

The slit-lamp is a critical tool in ophthalmology, providing a magnified view of the anterior segment of the eye, including eyelid, conjunctiva, cornea, iris, and lens. It allows for detailed examination and diagnosis of various eye conditions.

External imaging refers to methods used to capture images of the eye's exterior, which includes techniques to assess the overall ocular surface and alignment. This is essential for identifying abnormalities that could affect vision or indicate underlying health issues.

Fundus imaging involves capturing images of the interior surface of the eye, particularly the retina, optic disc, and macula. This provides crucial information about the eye's health and can help in diagnosing conditions like diabetic retinopathy or age-related macular degeneration.

Together, these three types of imaging provide a comprehensive understanding of ocular health and are essential tools in ophthalmic diagnostics and treatment planning. The other options mention modalities or tests that, while useful in their respective domains, do not encompass the core imaging techniques that are pivotal in the practice of ophthalmology.