Generate a correctly punctuated version of the following text: An infection that occurs in the cornea without the presence of an external damage is most often caused by a virus eg the herpes simplex virus which often causes wounds to the cornea which can be difficult to locate
An infection that occurs in the cornea without the presence of an external damage is most often caused by a virus, e.g. the herpes simplex virus which often causes wounds to the cornea which can be difficult to locate.