Final answer:
The phrase relates to exercises for assessing eye movements and visual tracking, specifically conjugate gaze and convergence. It is typically addressed within the context of neurobiology or vision science to evaluate saccadic movements and visual scanning abilities.
Step-by-step explanation:
The phrase '2 Best gaze - follows finger horizontally' most likely pertains to an exercise involving eye movements and visual tracking, specific to the field of neurobiology or vision science. In this context, 'best gaze' refers to the optimal performance of the eyes when following a moving object— in this case, a finger moving horizontally. Such exercises are used to assess and demonstrate the conjugate gaze, which is the coordinated movement of the two eyes simultaneously in the same direction, and convergence, the inward movement of the eyes toward the nose to maintain single binocular vision when viewing a close object.
A common test for eye coordination is to hold up a finger and have the person follow the finger with their eyes as it moves side to side. This tests saccadic eye movements, which are rapid, simultaneous movements of both eyes between two or more phases of fixation in the same direction. Saccades are crucial for visual scanning of the environment and are a part of the complex human visual system that allows for high acuity and assessments of one's surroundings.