What is the frisen scale?
The Frisén scale is a qualitative tool used to grade swelling on ONH photographs and exam. While this scale has been shown to have inter-rater reliability to assess papilledema from lack of papilledema, a study by Sinclair et al.
How is papilledema measured?
Papilledema can be observed with the same ultrasound views that are used to measure optic nerve sheath diameter, so looking for papilledema requires no additional work. Ultrasonographic papilledema may be combined with measurement of the optic nerve sheath diameter to evaluate for elevated intracranial pressure.
What is a normal optic nerve size?
The normal optic nerve head diameter varies in size from 1.2 to 2.5mm. There is some inconsistency in the literature as to what cutoffs to use for a small or large disc, but in general a disc can be considered small if ≤ 1.2 mm and large if ≥ 1.8 mm.
Is optic nerve edema an emergency?
Bilateral optic nerve edema is a medical emergency. The onset and severity of vision loss and symptoms are important clues to consider. Rapid onset is characteristic of ischemic optic neuropathy, inflammatory and traumatic causes, and optic neuritis.
What is optic disk edema?
Disc edema is an ophthalmoscopic finding defined by unilateral or bilateral swelling of the optic disc. There are several synonyms used to describe this finding including papillitis, papilledema, swollen or choked discs, and the most commonly used term – optic disc edema (ODE).
What is optic nerve edema?
Papilledema is the swelling of the optic nerve as it enters the back of the eye due to raised intracranial pressure. Fluid surrounding the brain is constantly produced and reabsorbed, maintaining just enough intracranial pressure to help protect the brain if there is blunt head trauma.
Can optic nerves be different sizes?
Examining the optic nerve can be a daunting task. Its potential permutations are diverse, with individualized variations in color, size and even vascular supply.
What is the normal range of intracranial pressure ICP?
For the purpose of this article, normal adult ICP is defined as 5 to 15 mm Hg (7.5–20 cm H2O). ICP values of 20 to 30 mm Hg represent mild intracranial hypertension; however, when a temporal mass lesion is present, herniation can occur with ICP values less than 20 mm Hg [5].
How is optic nerve edema treated?
In the case of IIH, common treatments include weight loss, a low salt diet, and medications, such as acetazolamide, furosemide, or topiramate. Surgery — in the form of shunting the excess fluid or making cuts into the optic nerve sheath — is usually only an option when lifestyle changes and medications are not working.
What is Papillitis?
General Discussion. Papillitis, also known as optic neuritis, is characterized by inflammation and deterioration of the portion of the optic nerve known as the optic disk.
What is Pseudopapilledema?
Pseudopapilledema is defined as anomalous elevation of one or both optic discs without edema of the retinal nerve fiber layer. Papilledema, on the other hand, is a swelling of the optic disc due to increased intracranial pressure.