The lens of the eye is a clear, flexible structure that allows the eye to focus. The absence of the lens of the eye (a condition called aphakia) is most common in adults who have had surgical removal of the lens due to cataracts (cataract surgery) or injury to the eye from a perforating wound or ulcer. People with aphakia have relatively small pupils that tend to dilate to a lesser degree. Symptoms include blurry vision, farsightedness (the ability to see distant objects more clearly than close objects), and the loss of accommodation (trouble focusing on objects). This can be corrected by wearing glasses, contact lenses, or by surgical implant of an artificial lens. Complications of aphakia include detachment of the vitreous or retina, and glaucoma.