The perpetrator, Yury Zarutsky, and a get-away driver Andrei Lipatov, also had their sentences reduced from 10 to nine years and four to two years respectively.
Zarutsky will be transferred from a "special regime" colony for repeat offenders to a less harsh "strict regime" colony.
The court reduced the total amount of compensation that the three men have to pay to Filin by 500,000 rubles ($13,800) to 3 million rubles.
Filin returned to work at the theatre in the autumn but is still undergoing treatment after having dozens of operations on his eyes, that were damaged by the acid.
The trial exposed bitter infighting at the Bolshoi with witnesses airing allegations of roles being handed out in exchange for sexual favours, although the motive for the Filin attack was never made fully clear.
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Zarutsky will be transferred from a "special regime" colony for repeat offenders to a less harsh "strict regime" colony.
The court reduced the total amount of compensation that the three men have to pay to Filin by 500,000 rubles ($13,800) to 3 million rubles.
Filin returned to work at the theatre in the autumn but is still undergoing treatment after having dozens of operations on his eyes, that were damaged by the acid.
The trial exposed bitter infighting at the Bolshoi with witnesses airing allegations of roles being handed out in exchange for sexual favours, although the motive for the Filin attack was never made fully clear.
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