*Cataracts are opacities of the<unk>  While some are small and do not require any treatment, others may be large enough to block light and obstruct vision. Cataracts usually develop as the aging<unk> becomes more and more opaque, but cataracts can also form congenitally or after injury to the<unk>  Nuclear sclerosis is a type of age-related cataract. Diabetes is another risk factor for cataract. Cataract surgery involves the removal of the<unk> and insertion of an artificial intraocular<unk>  *Presbyopia is the age-related loss of accommodation, which is marked by the inability of the eye to focus on nearby objects. The exact mechanism is still unknown, but age-related changes in the hardness, shape, and size of the<unk> have all been linked to the condition. *Ectopia lentis is the displacement of the<unk> from its normal position. *Aphakia is the absence of the<unk> from the eye. Aphakia can be the result of surgery or injury, or it can be congenital.
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Optic stalk