The gemara resolves a contradiction between the opinions of Rabbi Meir and the rabbis in the case of freeing a non Jewish slave with money to their opinions in a seemingly similar case regarding redeeming maaser sheni. A non Jewish slave is redeemed if you knock out a tooth, an eye or certain extremities of his body. The derivation of these laws from the verses in the Torah are discussed. Does the slave go free if the eye is not knocked out but is non functional or it was not functional before but the master actually knocked it out? What if the master was a doctor and damaged the eye while performing a surgical procedure?