Aphakia is a type of refractive eye disorder marked by the absence of a lens as a result of birth defect, eye injury, or eye surgery for cataract. A refractive error occurs when the cornea and lens cannot focus the image of an object sharply on the retina. This condition can affect one or both eyes. Congenital aphakia is the lack of a lens at birth. It is extremely rare and usually associated with severe arrest in ocular development resulting in microphthalmia or congenital cystic eye where the lens is smaller than normal. It may be an isolated lesion or occur as part of multiple ocular anomalies. If not already cataractous at birth, the affected eye often will opacify later in life. Aphakia can be corrected using plano bandage contact lenses and hydrogel contact lenses.

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