Final answer:
The next best step is to seek immediate medical attention from an ophthalmologist or an emergency department.
Step-by-step explanation:
The next best step in the management of a Japanese guy with severe eye pain and a rock hard eye would be to seek immediate medical attention from an ophthalmologist or an emergency department. A rock hard eye could be indicative of a serious condition, such as acute angle-closure glaucoma, which requires prompt intervention.
While waiting for medical help, the person can gently apply a cold compress or ice pack to the affected eye to help reduce pain and swelling. However, this should not delay seeking professional medical care as the underlying cause of the symptoms needs to be determined and treated by a healthcare professional.
It is important to note that attempting any self-treatment or ignoring the symptoms can lead to worsening of the condition and potential permanent vision loss.