The Main purpose for the Arrow station was to monitor the activity of the hostile inhabitants, so a glass eye was found by Libby. Mikhail Bakunin is an "Other" so it could be possible when the others were wiping out the DHARMA Initiative he infiltrated the Arrow station to use it for the "Others" biding when searching for the rest of the Initiative, he wears a patch so it could be strongly suggested that the eye is his.