Ordinary Transparent Clear Glasses do not have the advantages, so its application range is much wider than ordinary Tortoiseshell Glasses. Contact lenses are more suitable for high myopia, anisometropia over 3.00d, mixed or irregular astigmatism. In particular, some literary and sports workers, because of professional needs, wearing ordinary Light Tortoise Shell Glasses will affect work or competition results, can choose to use contact lenses. Some people have had cataract surgery in one eye and have to wear contact lenses because anisometropia is too big to wear normal Tortoise Shell Glasses.
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