What happens if there is a lesion at the optic chiasm?
What happens if there is a lesion at the optic chiasm?
A lesion involving complete optic chiasm, which disrupts the axons from the nasal field of both eyes, causes loss of vision of the right half of the right visual field and the left half of the left visual field. This visual field defect is called as bitemporal hemianopia.
What causes optic tract lesions?
Incomplete bilateral optic tract lesions may produce partial bilateral visual deficit with variable pupillary responses. The most common histopathologic finding in optic tract disease is demyelination. It may be caused by canine distemper, which has a predilection for the optic tracts.
What is the effect of a lesion in the left optic tract?
A lesion in one optic tract, interrupting all fibers carrying information from the contralateral visual fields, may cause homonymous hemianopia. When an injury to the left optic tract occurs, the patient will have visual difficulties (visual field cuts) in the right eye’s inner field, but in the left eye’s outer field.
What causes optic chiasm lesions?
Lesions that may compress the visual chiasm include pituitary adenoma, craniopharyngioma, and meningioma. Of these, pituitary adenoma is the third most common intracranial tumour in Japanese national statistics, and it is also common in other countries, accounting for 12%–15% of all intracranial tumors6–8.
How do you treat nerve damage in the eye?
Optic Nerve Damage Treatment
- For people diagnose with glaucoma, treatment may involve use of eye drops, oral medications or getting eye surgeries like laser therapy or drainage tubes.
- For people suffering from Optic Nerve drusen, may benefit from medication that lowers intraocular pressure.
What is Heteronymous bilateral field defects?
Definition. A bilateral visual field defect on opposite sides of the visual space of each eye (right or left). [ from NCI]
What is the function of the optic chiasm in the brain?
| Optic chiasm | |
|---|---|
| Optic nerves, chiasm, and optic tracts | |
| Details | |
| System | Visual system |
| Function | Transmit visual information from the optic nerves to the occipital lobes of the brain |
Can optic nerve damage be treated?
Unfortunately, once damaged, the optic nerve cannot be repaired since the damage is irreversible. The optic nerve is composed of nerve fibers that do not possess the ability to regenerate on their own. The nerve fibers, if damaged, cannot heal on their own.
