Which condition is a cause of amblyopia due to deprivation?

Amblyopia due to deprivation occurs when visual development is hindered by an obstruction or abnormality that prevents clear vision in one or both eyes during a critical period of visual maturation. This typically results in a reduced ability of the affected eye to develop normal vision, leading to amblyopia.

In the case of a child born with a large congenital cataract in one eye, the cataract obstructs the passage of light and thus prevents clear images from reaching the retina. This obstruction can significantly impede visual development and is a direct cause of deprivation amblyopia. The critical periods of visual development mean that if the cataract is not addressed early on, the affected eye may fail to achieve a functional level of vision, resulting in amblyopia.

Other conditions, while potentially leading to amblyopia, do not fall under the category of deprivation. For instance, constant strabismus may lead to amblyopia, but the vision is still developing; it is not strictly due to deprivation of light or a clear image. Monocular ptosis might hinder visual development, yet it does not completely block vision as cataracts can. In addition, uncorrected refractive error might lead to functional amblyopia due to poor visual input but does not constitute