Types of Amblyopia
Amblyopia (lazy eye) is a disorder of vision in which the brain fails to fully process input from one eye and over time favors the other eye; it results in decreased vision in the offending eye. The eye, internally and externally, will appear otherwise normal. Amblyopia is the most common cause of decreased vision in a single eye among children and younger adults. Importantly, if amblyopia has developed, LASIK or refractive surgery cannot restore the lost vision, but it can resolve the refractive error so the person can have optimal performance without glasses or contact lenses.
Strabismus amblyopia is the most common cause of amblyopia. To avoid double vision created by misaligned eyes, the brain ignores the visual input from the misaligned eye, which leads to amblyopia in that eye.
Refractive amblyopia is a common type of lazy eye. It occurs when a child is born with a high refractive error (diminished acuity or blurriness) in one eye compared to the other eye. Externally and internally, the eyes will appear normal, and the eyes will be aligned.
Deprivation amblyopia is the least common form of amblyopia. It is typically the most severe form of amblyopia, and it often causes the worst vision in comparison to other types of amblyopia. Deprivation amblyopia occurs when the visual axis is obstructed. Causes of stimulus deprivation include eyelid ptosis, corneal opacities, cataracts, and vitreous hemorrhage, among others.