**A.2 Analysis of the relationship τ<sup>R</sup> = τS/3**

People who have the perfect vision feel safer with binocular viewing than with monocular viewing. However, it is necessary that there is the nasal image fusion with the contralateral eye temporal image. In this way, the brain corrects the conical deformations caused by the distance between the eyes foci and uses twice as many neurotransmitters to interpret the received image, producing mathematically more than twice the accuracy than obtained with the monocular visualization. However, when the distance between the foci of the eyes is negligible in relation to a distant object under observation, the accuracy between the binocular and monocular visualizations is negligible; however, it is necessary to always use the binocular visualization to avoid habitual use of the same eye and thus stimulate ocular dominance.

Fusion of the images is the last step in the binocular visualization process, i.e., when the eyes are concluding their targeting on to the fixation point, fusion of images is at its beginning. Based on this, it was concluded that the time constant of the cornea accommodation (τS) is equal to three times the time constant for the eye fixation in the direction of the object (τR). Graph 3 shows that at time t = τR = τS/3, the fixation has 63% of the work completed, while the image fusion is 28%; that is, the numerical result is compatible with the associated analysis between the agility of the fixation and the accommodation of the cornea. Fusing images stabilizes the eye fixation direction.
