<prompt> Lens develops from?EndodermMesodermSurface ectodermNeuroectoderm  <response>: Ans. c Surface ectoderm. Ref. Human Embryology by IB Singh, 6th352LENS LENS develops from surface ectoderm. Compared to the cornea, it has a much lower converging power of 17 diopters because of the relatively similar refractive indices of aqueous humor, lens, and vitreous body cornea 42 D. However, the lens is the only part of the refractive apparatus that is adjustable. Adjustment to near vision accommodation therefore involves only the lens. In addition, the lens functions as a UV filter for wavelengths between 300 and 400 nm and thus has a protective function for the macula. Notching of the lens pseudocoloboma. Wilsons disease can induce a yellow-green lens discoloration chalcosis sunflower cataract. Granular gold deposits located under the lens chrysiasis lends can occasionally occur after prolonged treatment with gold preparations e. g. in primary chronic polyarthritis . Other medications, e.g., amiodarone or chlorpromazine, are sometimes deposited in the lens. In patients with cataract, glittering cholesterol crystals are not infrequently found in the lens so-called Christmas tree decoration cataract. 