The response may result in the destruction of the corneal stroma, resulting in loss of vision due to opacification of the cornea. This is known as immune-mediated stromal keratitis. HSV infection is very common in humans. It has been estimated that one third of the world population have recurrent infection. Keratitis caused by HSV is the most common cause of cornea-derived blindness in developed nations. Therefore, HSV infections are a large and worldwide public health problem. The global incidence (rate of new disease) of herpes keratitis is roughly 1.5 million, including 40,000 new cases of severe monocular visual impairment or blindness each year. Signs and symptoms
Primary infection
Primary infection most commonly manifests as blepharoconjunctivitis i.e. infection of lids and conjunctiva that heals without scarring. Lid vesicles and conjunctivitis are seen in primary infection. Corneal involvement is rarely seen in primary infection. Recurrent eye infection
Recurrent herpes of the eye is caused by reactivation of the virus in a latently infected sensory ganglion, transport of the virus down the nerve axon to sensory nerve endings, and subsequent infection of ocular surface. The following classification of herpes simplex keratitis is important for understanding this disease:

Dendritic ulcer (Epithelial keratitis)
This classic herpetic lesion consists of a linear branching corneal ulcer (dendritic ulcer). During eye exam the defect is examined after staining with fluorescein dye. The underlying cornea has minimal inflammation. Patients with epithelial keratitis complain of foreign-body sensation, light sensitivity, redness and blurred vision. Focal or diffuse reduction in corneal sensation develops following recurrent epithelial keratitis.
The following were conditions under the term Somatoform Disorders:

Conversion disorder: A somatic symptom disorder involving the actual loss of bodily function such as blindness, paralysis, and numbness due to excessive anxiety
Somatization disorder
Hypochondriasis
Body dysmorphic disorder: wherein the individual is concerned with body image, and the disorder is manifested as excessive concern about and preoccupation with a perceived defect of their physical appearance. Pain disorder
Undifferentiated somatic symptom disorder – only one unexplained symptom is required for at least six months.In the newest version of DSM-5 (2013) somatic symptom disorders are recognized under the term somatic symptom and related disorders:

Somatic symptom disorder: To replace many of what was formerly known as somatization disorders and hypochondriasis (hypochondria). Factitious disorder: Can be either imposed on oneself, or to someone else (formally known as factitious disorder by proxy). Illness anxiety disorder: A somatic symptom disorder involving persistent and excessive worry about developing a serious illness. This disorder has recently gone under review and has been altered into three different classifications. Somatoform disorder not otherwise specified (NOS)Included among these disorders are false pregnancy, psychogenic urinary retention, and mass psychogenic illness (so-called mass hysteria). Somatization disorder as a mental disorder was recognized in the DSM-IV-TR classification system, but in the latest version DSM-5, it was combined with undifferentiated somatoform disorder to become somatic symptom disorder, a diagnosis which no longer requires a specific number of somatic symptoms.