From what you've described this does sound consistent with a herpes virus infection of the eye. Unfortunately the herpes simplex virus can affect many tissues of the body, the eye being one of them. And within the eye, it can affect nearly every layer of the eye from the cornea all the way back to the retina.
In light of this, acyclovir is the correct treatment. As to what extent the virus is in his eye he may even need steroid treatment in the eye concurrently with the acyclovir.
Most people usually do not get very sick if their outbreak is a recurrence or reactivation of the virus. A lot of people in the population have herpes virus latent in our nerve cells in our body and it can reactivate and cause these blisters. However, when the infection is the first of its kind in a person (a primary infection) it can cause someone to be quite sick and can even cause an encephalitis.
Because of the severity of the potential complications, this is certainly something you don't want to fool around with and want to make sure he has close follow-up with his primary care doctor and his ophthalmologist.
Does that help address your concerns?
I am happy to be able to help you today. If you would be so kind, please help me get credit for my efforts in answering your questions and press the ACCEPT button for this encounter. I will also be happy to answer any other questions until you have the information you need.
Any positive feedback and/or bonus you may feel prompted to provide would be welcomed and is appreciated. Thanks for your inquiry!
My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.