Where the eyes turn inward to focus on an object, this informs the individual that the object is close. this is an example of a primary binocular cue called

Diplopia

Explanation:

Diplopia, also called double vision, happens when the eyes are not aligned correctly, transmitting images of the same object to the brain, but from different angles. People with diplopia cannot fuse images from both eyes into a single image, creating the sensation that two objects are being seen instead of one; or they need to point their eyes inward to focus on an object.

Of all the vision disorders, diplopia is perhaps one of the most troublesome - and identifying its cause is a challenge. Diplopia happens when the eyes have a discrepancy between them and send images of the same object to the brain from different angles, so that it cannot understand them as the same and cannot merge them into one, causing vision double.

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