Doesn't matter if you are trained or untrained there is no way you are going to be able to successfully argue in a U.K. Court that it was reasonable to pluck an attackers eye out just because they slapped you.In short the Prosecution can argue, and the Jury consider, that based on training and experience the defendant claiming self defense was capable of instinctively NOT plucking out the eye of an attacker who simply slapped them and that, for whatever reason, they chose to do so where they may not be able to do so to someone unaccustomed to violence.
Also, it would be tremendously difficult for the jury to consider anything, as unless you kill your attacker (and are therefore charged with murder or manslaughter) self defence cases are usually heard in magistrates court, which doesn't have a jury. Not every country handles or interprets their laws in the same way yours does, which is what is trying to be explained, and yours is certainly not the "standard" as you originally claimed.
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