Optic nerve avulsion

Introduction to optic avulsion Optic avulsion refers to the removal of the optic papilla, that is, the inner segment of the optic nerve ball and the scleral sieve plate are removed from the scleral tube. The reasons are as follows: 1 blunt force acts on the eyeball, blasting force occurs in the ball, causing the scleral sieve plate at the thinnest part of the ball wall to rupture; 2 the impact from the side of the eyeball causes the eyeball to rotate extremely or move forward, which is suddenly and strongly The pulling causes the edge of the optic papilla to tear. The reason why tearing mostly occurs at the edge of the optic papilla may be that the axon of the optic ganglion cells is related to the lack of outer membrane protection; after the tear, the nerve fibers are retracted in the optic nerve sheath, and the optic nerve sheath remains elastic due to elasticity. continuous. Under the ophthalmoscope, there are different changes due to the degree of laceration, and complete avulsion is accompanied by vitreous hemorrhage. Early conditions cannot be seen. When it is possible to see through, it has changed in the later stage. The nipple is gray-black hole-like, retinal opacity and large piece of hemorrhage. The retinal blood vessels are completely or partially concealed. Finally, the hole is filled with gray-white organic matter, the surrounding chorioretinal atrophy, pigment hyperplasia, There are large pieces of mechanized membrane mass in the vitreous, and white lines of retinal blood vessels (especially arteries). Part of the avulsion fundus has not been completely covered by hemorrhage, it can be seen that part of the optic papilla is gray-black depression, pigmentation on the edge, turbidity and hemorrhage in the vicinity of the retina, narrow retinal blood vessels, knee-shaped disappeared at the edge of the depression, seen in the late stage, as complete Avulsion, only the extent is limited to the avulsion side. basic knowledge The proportion of illness: 0.0021% Susceptible people: no special people Mode of infection: non-infectious Complications: retinal detachment

Optic avulsion etiology

The eyeball is extremely rotated and forwardly displaced; the extrusion causes the sieve plate to rupture due to a sudden increase in internal pressure; the perforating injury causes the optic nerve to be pulled backwards. Under these aggressions, the optic nerve is first strongly dislocated from the scleral tube. Causes the optic nerve to avulsion.

Optic nerve avulsion prevention

1. It is not advisable to use excessive fatigue.

2. Lift heavy objects.

3. Prevent the occurrence of myopia.

4. Do less intense activities.

5. Patients with myopia should go to the hospital regularly, especially those with poor fundus.

6. Prevent eye injuries.

Optic avulsion complications Complications, retinal detachment

The retina is shed.

Optic avulsion symptoms Common symptoms Visual impairment Retinal edema Retinal hemorrhage Vitreous blood

It can be seen that the optic disc is pit-shaped, posterior hemorrhage, contusion-like necrosis. Usually vision is completely lost.

Examination of optic nerve avulsion

Pupil examination, slit lamp microscopy, dilated fundus examination, CT scan of the skull and ankle.

CT scans are not always believable in the identification of optic avulsions. High-quality nuclear magnetic resonance scans with thin sections may be able to resolve the avulsion of the optic nerve after edema and hemorrhagic absorption.

Diagnostic identification of optic nerve avulsion

It can be diagnosed according to the clinical and its examination.

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