Which condition is defined as a disorder where the eyes cannot be directed in a parallel manner towards the same object?

The condition defined as a disorder where the eyes cannot be directed in a parallel manner towards the same object is strabismus. Strabismus, commonly referred to as "crossed eyes," occurs when the eyes are misaligned and do not work together to focus on a single point. This misalignment can result in various visual problems and can affect depth perception and binocular vision.

In contrast, astigmatism relates to a refractive error in the eye caused by an irregularly shaped cornea or lens, leading to blurred vision. Amblyopia, often known as "lazy eye," is a developmental impairment of one eye that leads to decreased vision and is not primarily about the alignment of the eyes. Glaucoma is a group of eye conditions that damage the optic nerve, often associated with high intraocular pressure, and does not pertain to misalignment. Understanding strabismus helps in recognizing the importance of proper eye alignment for effective visual processing.