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Doctor insights on: The Optic Disk Is Where The Optic Nerve Leaves The Eye Ball

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What are the functions of the optic nerve, the retina, the iris, the cornea, and the pupil?

What are the functions of the optic nerve, the retina, the iris, the cornea, and the pupil?

The visual pathway: Light passes through the cornea, which is the front "windshield" of the eye and helps focus the light. The iris works as a muscle to increase or decrease the size of the pupil; this controls how much light comes into the eye. Light hits the retina, which converts the light into signals which are sent, via the optic nerve, to your brain. ...Read more

Nerve (Definition)

The brain and spinal cord communicates with what is occurring in the internal organs and limbs by nerve fibers where are like electrical wires with insulation (myelin) and the "copper" (axon). Within brain and spinal cord these nerves connect to other nerves via synapses on both axons and dendrites. A nerve can carry information regarding sensations, and ...Read more


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Optic nerve damage in the eye?

Optic nerve damage in the eye?

Optic nerves: A thorough exam can help determine the extent of the damage in many cases along with visual field and oct testing. A neuroophthalmic exam may be required in addition to an MRI or ct scan in some cases. ...Read more

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When the eyeball is removed is the optic nerve also removed?

When the eyeball is removed is the optic nerve also removed?

Partially: When the eye is enucleated, part of the optic nerve is cut and removed with the eye. If the eye is eviscerated, the nerve and the sclera of the eye are left behind after removing the internal contents of the eyeball. ...Read more

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What is the optic nerve?

Optic nerve: The optic nerve is at the back of the eyeball and transmits visual information from the eye to the brain. ...Read more

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What is a posterior subcapsular cataract and ischemia of the optic nerve?

What is a posterior subcapsular cataract and ischemia of the optic nerve?

2 different things: There are many types of cataract. Posterior subcapsular cataract refers to cloudiness on the back part of the lens just under the capsule. This may be caused by injury, steroids, elevated blood sugar and aging. Ischemia of the optic nerve means that there is or was an episode of poor blood flow to the nerve which may result in vision loss. ...Read more

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What is a posterior subcapsular cataract and ischemia of the optic nerve?

What is a posterior subcapsular cataract and ischemia of the optic nerve?

2 different things: Posterior subcapsular cataract is a change in the lens transparency from deposits and alteration of the back capsule of the lens. Ischemia of the optic nerve is deficiency of the blood supply to the main nerve of sight with loss of vision. ...Read more

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If vision was completely lost due to a craniopharyngioma, was the optic chiasm damaged or another part of the optic nerve?

If vision was completely lost due to a craniopharyngioma, was the optic chiasm damaged or another part of the optic nerve?

Report visual fields: If the chiasm was affected then, you'd have lost visual fields in BOTH eyes. If you had visual field loss only in one eye then, it is more likely that the problem is in front of or beyond the chiasm which could be then, an optic nerve or one set of optic radiations. ...Read more

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Which type of nerve goes from the spinal cord to the muscle that bends the forearm?

Which type of nerve goes from the spinal cord to the muscle that bends the forearm?

Biceps?: The nerve responsible for flexion of the elbow is the musculocutaneous while the radial nerve and its branches extend your elbow, also help with flexion, and extend the wrist and fingers. ...Read more

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Where is the optic chiasm located?

Where is the optic chiasm located?

Under brain: It is underneath the pituitary gland at the base of the brain and rests atop the nasal cavities. ...Read more

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If the nerves inside the eye like the ciliary nerves get damaged could it effect the color of the iris resulting in a darker colored iris?

If the nerves inside the eye like the ciliary nerves get damaged could it effect the color of the iris resulting in a darker colored iris?

Color: Ciliary nerve damage probably will not affect eye color. Damage to the eye from trauma, might cause eye color to get lighter, not darker. Certain eye medications, such as latanoprost, may cause eye color to become darker. ...Read more

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What is the name of that illness which is inside the nerves of the brain when the nervous currents can't cross the nerves of the brain in left side?

What is the name of that illness which is inside the nerves of the brain when the nervous currents can't cross the nerves of the brain in left side?

not sure: Not sure i understand the question. Do you mean like a disconnection syndrome? Maybe try rephrasing your question. ...Read more

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Which part of the eye is damaged when you have tunnel vision?

Which part of the eye is damaged when you have tunnel vision?

This is from retina: Advanced retinal degenerative disease like retinitis pigmentosa creates the disabling tunneling of vision. Advanced glaucoma and diabetic change can also do this. Certain types of optic nerve trauma and disease can also lead to tunneling. ...Read more

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What happens if the ventral root of the spinal nerve is cut?

What happens if the ventral root of the spinal nerve is cut?

Weakness or paralysi: The ventral root contains the motor fibers which control our muscles. Because muscles have multiple nerve roots innervating them the result may only be weakness in a particular group of muscles or could be paralysis if the particular nerve root is the dominant root. ...Read more

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Please explain lumbar MRI -there is a narrowing of the lateral recesses, particularly on the right but without displacement of traversing nerve roots.

Please explain lumbar MRI -there is a narrowing of the lateral recesses, particularly on the right but without displacement of traversing nerve roots.

Lumbar MRI findings: The explanation means early degeneration is causing compression of the spinal fluid sack, but is not putting pressure on the nerves. The results would not explain leg pain, but may cause back pain. Please review with the ordering physician to correlate your symptoms. ...Read more

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If you have a pinched nerve in the upper spine and it causes permanent paralysis, is the paralysis only in the location the nerve attaches to?

If you have a pinched nerve in the upper 
spine and it causes permanent paralysis, is the paralysis only in the location the nerve attaches to?

Yes: That is correct. The muscles connected to the damaged nerves will not work correctly, or will not work at all. Other nerves that are undamaged will continue to send signals to their muscles, and keep them moving properly. However, muscles work together as groups of muscles. That means weakness or paralysis in a few muscles can make a limb malfunction even if other muscles in the limb are working. ...Read more

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Why is the fovea centralis different from the rest of the retina?

Why is the fovea centralis different from the rest of the retina?

Central vision: This part of the central retina is uniquely evolved to maximize central visual acuity for tasks like reading and recognizing people's faces. It does not help us with peripheral vision as the peripheral retina does. ...Read more

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Is it true that the bigger the visual field defect, the worser the brain has been damaged?

Is it true that the bigger the visual field defect, the worser the brain has been damaged?

Depends: If the area of the brain damaged is the occipital lobe or the optic radiations, then visual field defects can occur. Generally damage at its maximum occurs immediately and over time there can be a lessening if the areas recover. Of course, the larger the initial damage, the more changes will be detected. Your neurologist can help sort this out. ...Read more

Optic Nerve (Definition)

The optic nerve receives input from the retina and transmits information to the optic chasm and ultimately the occipital lobe of brain so that images can be ...Read more


Dr. Sadiqa Stelzner
834 doctors shared insights

Eye Health (Definition)

Eye health involves the function and vision of the eye and all ...Read more