text: Galactitol accumulates in this structure in galactokinase deficiency.
full_question: Galactitol accumulates in this structure in galactokinase deficiency. In diseases such as homocystinuria and Marfan syndrome, this structure experiences subluxation. Type IV collagen is abundant in this structure's namesake capsule. 90% of the proteins in this structure are alpha, beta, and gamma-crystallins. The Zonules of Zinn connect it to the ciliary body. These structures are absent in aphakia, and are thought to lose their elasticity in presbyopia. A large patch of (*) gel located behind this structure is called the vitreous humor. These anatomical structures contribute the second most diopters, and they become clouded in cataracts. For 10 points, name these biconcave structures in the eye that work with the cornea to refract light.
first_sentence: Galactitol accumulates in this structure in galactokinase deficiency.
raw_answer: lenses