It is valid for a blind person to lead the prayer and it is not makrooh

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Check below answers in case you are looking for other related questions:
Praying in a room at the edge of which is a toilet
Ruling on praying in places frequented by dogs

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Related Answers:
Being 45 degrees off from the qiblah
It is permissible to have the intention of praying at the same time as the opening takbeer or before it
Can girls pray in pants?
Praying in a room at the edge of which is a toilet
Ruling on praying in places frequented by dogs

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