What type of imaging utilizes a slit-lamp?

The slit-lamp is a versatile instrument commonly used in ophthalmology for examining the anterior segment of the eye, including the cornea, iris, and lens, which falls under external imaging. However, it also plays a crucial role in facilitating indirect viewing of the fundus, particularly when combined with special lenses.

When using a slit-lamp, clinicians can employ a variety of techniques and accessories, such as the 78D or 90D lenses, which help to visualize the retina and optic nerve during a thorough fundus examination. This dual capability of the slit-lamp makes it an essential tool for both external and fundus imaging assessments, hence the correct answer encompasses both imaging techniques.