An intraocular lens (IOL) is an artificial lens made of silicone or acrylic, placed within the eye when the natural lens is removed, most often for cataract.
Posterior vitreous detachment is usually painless and may not impair vision. However complications such as retinal detachment may ensue. Vitreous fills most of the interior of the eyes.
Bietti crystalline dystrophy is a condition in which lipid deposits accumulate in the retinal tissues of the eye leading to progressive loss of vision.