What type of testing equipment allows for controlled illumination and continuous fixation checking from behind the device?

The Goldmann Perimeter is specifically designed for perimetry, which assesses a patient's visual field. One of its key features is the ability to provide controlled illumination, allowing the examiner to test various aspects of the visual field under consistent lighting conditions. Additionally, it has a mechanism for continuous fixation checking, ensuring that the patient's gaze remains steady during the testing process. This is critical for accurate measurements, as the visual field can vary greatly based on eye position and fixation stability.

In contrast, other tools like the slit lamp are primarily used for examining the anterior segment of the eye and would not be conducive to delivering controlled illumination for visual field testing. The ophthalmoscope is designed for viewing the interior of the eye rather than measuring visual fields. While the perimeter also assesses visual fields, the specific mention of continuous fixation checking and the combination of these functionalities with controlled illumination makes the Goldmann Perimeter the most suitable choice for the given context.