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Many early Siamese were cross-eyed to compensate for the abnormal uncrossed wiring of the optic chiasm, which is produced by the same albino allele that produces coloured points. However the crossed eyes have been seen as a fault and through selective breeding, the trait is far less common today.
Details of the Tyrosinase mutation are available in this 2006 paper: Albinism in the domestic cat (Felis catus) is associated with a tyrosinase (TYR) mutation
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