What is a post Chiasmal disorder?

What is a post Chiasmal disorder?

Post-chiasmal disorder affects the retina, and it is characterized by vision problems, headaches, and even blindness. Chiasmal syndromes affect the optic chiasm, the part of the brain at which the optic nerves partially cross each other.

What is chiasmal optic neuritis?

Chiasmitis, or chiasmal optic neuritis, is characterized by acute vision loss with a visual field defect and/or radiographic findings consistent with a lesion of the optic chiasm. Chiasmitis can be caused by inflammatory, infectious, toxic, or autoimmune processes.

What is chiasmal compression?

Abstract. Compression of the optic chiasm causes an optic neuropathy that may be associated with reversible visual loss often immediately following surgical decompression.

What diseases can affect the optic chiasm?

Diseases of the Optic Chiasm

• Inflammatory disorders such as multiple sclerosis.
• Infections such as tuberculosis.
• Benign (noncancerous) tumors and cysts.
• Cancerous tumors.
• Vascular (blood vessel) disorders.

What is idiopathic optic neuritis?

Optic Neuritis (ON) is defined as inflammation of the optic nerve, which is mostly idiopathic. However it can be associated with variable causes (demyelinating lesions, autoimmune disorders, infectious and inflammatory conditions). Out of these, multiple sclerosis (MS) is the most common cause of demyelinating ON.

What symptoms would Chiasmal compression cause?

The symptoms of compressive lesions of the optic chiasm vary among patients and can be very diverse. Symptoms include not only decreased visual acuity and visual field defects, but also endocrine symptoms, headache, and photophobia1,2.

Why would a pituitary tumor affect vision?

Sometimes a pituitary tumor affects the optic nerve on just one side. In other cases, it affects a structure known as the “optic chiasm,” where the optic nerves from each eye merge together. When a pituitary tumor pushes the optic chiasm, it causes visual loss in both eyes.

How do you test for functional vision loss?

Diagnosis. The diagnosis of functional visual loss requires positive findings and cannot be a diagnosis of exclusion The key to diagnosing NOVL is to first complete a full, dilated eye examination to rule out organic causes of visual loss such as refractive error, dry eye, cataract, uveitis, maculopathy, etc.

Can FND cause blindness?

Symptoms of FND may include, but are not limited to: Bowel and bladder problems. Seizure-like episodes. Vision problems and blindness.

Does optic neuritis always mean MS?

You may have vision problems in the future if you have optic neuritis but don’t have MS or another underlying condition. Your prognosis for improved long-term vision is better than if you do have MS, however. Having both optic neuritis and MS may make you more likely to experience recurring symptoms of optic neuritis.