Which of the following techniques is least likely used clinically during an optometric exam?

The method of constant stimuli is indeed less commonly used in clinical optometric exams compared to other techniques. This method involves presenting a fixed set of stimuli at various intensities to a subject and gauging their ability to perceive them. While it provides precise threshold measurements, it is often considered less practical in a busy clinical setting due to the time and resources it consumes.

In contrast, techniques such as the method of ascending limits and the method of descending limits are more frequently utilized. Both of these methods allow for quicker and more efficient determination of perceptual thresholds. They involve systematically adjusting the intensity of stimuli based on the patient's responses, making them much more suitable for the fast-paced nature of clinical practice. The stoic method, although less well-known, refers to a technique that may be employed under specific circumstances but is not generally recognized as a standard practice in optometry.

Overall, the method of constant stimuli's requirement for a larger sample of data and its time-intensive nature render it less favorable for clinical use in optometric exams, thereby making it the least likely technique to be employed.