Which of the following is NOT a type of ophthalmic imaging?

Ophthalmic imaging encompasses various techniques used to visualize the structures within the eye and its surroundings for diagnostic purposes. While ultrasound is indeed a critical tool in ophthalmology, it is typically classified as a diagnostic procedure rather than a direct imaging technique. The other options represent established imaging modalities.

External imaging refers to non-invasive techniques that examine the exterior structures of the eye, such as photography and videography used to assess the eyelids, conjunctiva, and anterior segment.

The slit lamp is a specialized microscope that allows the clinician to view the anterior segment of the eye, including the cornea, lens, and iris, in detail, providing essential information for diagnosis and management of various eye conditions.

Fundus imaging, such as fundus photography or fluorescein angiography, focuses on capturing images of the retina and the optic nerve head, crucial for detecting diseases like diabetic retinopathy and glaucoma.

These imaging techniques are integral in the assessment and management of ocular health, with each serving distinct purposes in ophthalmic practice. Thus, while ultrasound is a valuable diagnostic tool in ophthalmology, it is not classified in the same category as the other imaging types listed.