Based on the cover test findings, what is the diagnosis if the left eye moves 1/10 times upon covering the right eye?

The diagnosis in this scenario is based on the implications of the cover test findings, where the left eye only moves 1 out of 10 times when the right eye is covered. This suggests that there is a consistent preference for the right eye over the left. In cases of intermittent alternating exotropia, there would be periodic outward deviation of one or both eyes, usually when the eyes are not focused on a target.

The low frequency of movement of the left eye indicates that it may not be the favored eye and supports a diagnosis of intermittent alternating exotropia, where the eye that does not have preference periodically deviates outward. The fact that it is intermittent suggests that the deviation can alternate between eyes, hence indicating a fluctuation rather than a constant condition.

A 25 prism diopter measurement gives a quantifiable assessment of the extent of the deviation, which is significant enough to be classified as a clinical condition. Since the left eye is the one less utilized when focusing and is preferred less, it directly aligns with the diagnosis stated in the answer. This understanding is important in assessing the visual and treatment options for the patient.