Which diagnostic method is used for diagnosing HSV keratitis?

The diagnostic method used for diagnosing herpes simplex virus (HSV) keratitis is slit lamp examination with fluorescein staining. This technique allows healthcare providers to assess the cornea for the characteristic dendritic ulcers associated with HSV infection. During the examination, fluorescein dye is instilled into the eye, and the cornea is illuminated with a slit lamp, which provides a magnified view. The dye highlights areas of damage on the cornea, making it easier to identify the specific patterns indicative of HSV keratitis.

Other methods like CT scans or ultrasound imaging are not typically employed for diagnosing HSV keratitis, as they do not provide the necessary detail of the corneal surface or observe changes caused by viral infection. Visual acuity assessment primarily measures how well a person can see but does not provide specific information about the corneal health or the presence of an HSV infection. Therefore, slit lamp examination with fluorescein staining is the gold standard for diagnosing this condition, effectively showing the presence of the virus and guiding further management.