Light Sensitivity: Clinical Meaning

Migraine

Migraine is a neurological disorder characterized by recurrent, severe headaches often accompanied by nausea, vomiting, and sensitivity to light and sound. Attacks can last 4–72 hours and significantly impair daily functioning.

Meningitis

Meningitis is inflammation of the meninges (membranes surrounding the brain and spinal cord), caused by bacteria, viruses, or fungi. Bacterial meningitis is a medical emergency causing severe headache, neck stiffness, fever, and potentially fatal if untreated.

Bacterial Meningitis

Bacterial meningitis is a medical emergency caused by bacteria such as Neisseria meningitidis and Streptococcus pneumoniae infecting the meninges. It causes severe headache, neck stiffness, photophobia, and can rapidly cause brain damage or death.

Cataracts

Cataracts are clouding of the eye lens causing progressive blurry vision, glare, and reduced color contrast, most commonly due to aging. Surgical removal and replacement with an artificial intraocular lens is highly effective and one of the most performed surgeries worldwide.

Uveitis

Uveitis is inflammation of the uveal tract (iris, ciliary body, choroid) causing eye pain, redness, photophobia, and blurred vision. It can be associated with systemic diseases (ankylosing spondylitis, sarcoidosis); corticosteroids and immunosuppressants are used.

Dry Eye Syndrome

Dry eye disease occurs when tears cannot adequately lubricate the eyes due to insufficient production or rapid evaporation. One of the most common eye conditions worldwide.

Viral Meningitis

Viral meningitis is inflammation of the membranes surrounding the brain and spinal cord caused by viruses. Less severe than bacterial meningitis, most cases resolve without specific treatment.

Subarachnoid Hemorrhage

Subarachnoid hemorrhage is bleeding into the subarachnoid space surrounding the brain, most often caused by a ruptured cerebral aneurysm. It classically presents with a sudden, severe thunderclap headache described as the worst headache of life, accompanied by nausea, vomiting, and neck stiffness.

Retinal Detachment

Retinal detachment is an ophthalmic emergency in which the retina separates from its underlying tissue. It presents with sudden flashes of light, floaters, and a curtain-like shadow across vision. Without urgent surgical repair, permanent vision loss occurs.