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Dr Thornton points out correctly, I believe, that the new generation of intraocular lenses have improved considerably over the old ones, and that many of the mechanical difficulties of the old ones have been eliminated. However, some problems still remain.There is no guarantee at the present time that each is produced exactly the same as the previous one, although it may have the same appearance. The Food and Drug Administration has been concerned about the clinical and biological nature of each intraocular lens. For example, the manufacturer at present is not required to provide any information or proof of quality control. It would be important to know how much monomer might be present or whether there are any antioxidants, fixatives, or other compounds used in preparing the polymer and lens materials that might leach from the lens during the time the lens resides in the ocular fluids.
Leopold I. Lens Implants in Cataract Surgery-Reply. JAMA. 1976;235(13):1326. doi:10.1001/jama.1976.03260390012007
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