Recent research reveals that horses are hard-wired to prefer people on the left, that is to use their left visual field.
Three primary outcomes from this and other studies show:
The more emotional a horse is, the more likely it is to use its left eye to view a new, potentially frightening object
ii) Second, most horses show a stronger startle reaction to a frightening object when it is presented on the left.
iii) Third, under normal circumstances, horses prefer to use the left eye to view objects with a positive or negative association, and the right eye for neutral objects.
Clinical observations of patients in Optometric Vision Therapy, reveals different personality qualities through each eye. While doing patching of one eye, say the right, and the patient talks about their perceptions of their mother, depending on the emotional association, visual acuity through the open eye can reveal as much as 3 to 5 lines change.
The right eye view appears to react to a male oriented perception.
Robert-Michael Kaplan - The Power Behind Your Eyes.
Roberto Kaplan - Conscious Seeing