Which is not a slit lamp illumination?

Slit lamp illumination techniques are essential in ophthalmology for examining the anterior segment of the eye, as they provide different ways of highlighting tissue structures. Among the common types of slit lamp illumination are diffuse, direct, and sclerotic scatter.

Diffuse illumination involves spreading light uniformly over a large area, which helps in assessing the overall health of the eye by allowing a broad view. Direct illumination focuses the beam on a specific area, enhancing details of the structures being examined, such as the cornea or lens. Sclerotic scatter illumination is a specialized technique used to enhance the visibility of fine details by illuminating the eye in such a way that the light scatters off the cornea, revealing any irregularities or abnormalities.

In contrast to these specific methods, "modern" does not refer to a recognized technique of illumination used in slit lamp examination. While advancements in technology may have led to various improvements or modifications in practice, "modern" on its own does not describe a defined style or method of slit lamp illumination. Thus, it is not categorized among the established techniques.