- 1 What is a optic disc anatomy?
- 2 Where is the optic disc located?
- 3 What is a normal optic disc?
- 4 How do you identify optic discs?
- 5 What is function of optic nerve?
- 6 What does a normal optic disc look like?
- 7 What are signs of optic nerve damage?
- 8 What is another name for the optic disc?
- 9 Why is the optic disc called the blind spot?
- 10 What is Disc at risk?
- 11 How can I strengthen my optic nerve?
- 12 What color should the optic nerve be?
- 13 What is notching of optic disc?
- 14 What is Pseudopapilledema of optic disc?
- 15 What is the cup of the optic disc?
What is a optic disc anatomy?
Anatomical Parts The optic disc ( optic nerve head) is the location where ganglion cell axons exit the eye to form the optic nerve. There are no light sensitive rods or cones to respond to a light stimulus at this point. This causes a break in the visual field called “the blind spot” or the “physiological blind spot”.
Where is the optic disc located?
The optic disk can be seen in the back of the eye with an ophthalmoscope. It is located on the nasal side of the macula lutea, is oval in shape, and is approximately 1.5 mm (0.06 inch) in diameter. It is also the entry point into the eye for major blood vessels that serve the retina.
What is a normal optic disc?
The average vertical optic disc diameter is 1.88 mm (vertically ranging from 1,700–2,000 μm), and the average horizontal diameter is 1.77 mm (ranging from 1,600–1,800 μm). Thus, a normal healthy optic disc is usually vertically oval.
How do you identify optic discs?
Probably the most accurate way to manually measure the optic disc is to do high-plus non-contact funduscopy using a 78- or 90-D lens and a slit lamp. To do this, simply bring the disc into view with your high plus lens using a narrow slit lamp beam.
What is function of optic nerve?
The optic nerve is a bundle of more than 1 million nerve fibers. Also known as the second cranial nerve or cranial nerve II, it is the second of several pairs of cranial nerves. It transmits sensory information for vision in the form of electrical impulses from the eye to the brain.
What does a normal optic disc look like?
Typically the optic disc looks like an orange-pink donut with a pale centre. The orange-pink appearance represents healthy, well perfused neuro-retinal tissue. There are many pathological reasons why a disc may lose this orange-pink colour and appear pale ie optic atrophy.
What are signs of optic nerve damage?
Symptoms of Optic Nerve Damage
- Decline in the field of vision.
- Distorted vision.
- Inflammation in the eye.
- Temporary or permanent vision loss.
- Unusual symptoms include numbness or weakness of the limbs, which may be a result of a neurological disorder.
What is another name for the optic disc?
The optic disc or optic nerve head is the point of exit for ganglion cell axons leaving the eye.
Why is the optic disc called the blind spot?
The optic disk is the part of the retina where the optic nerve leaves the eye and heads to the brain. In the optic disk, there are no receptor cells. Because there are no receptors at the site of the optic disk, this location is also called the blind spot.
What is Disc at risk?
Purpose: The presence of the so called disc at risk (a small disc with no cupping) has been considered the main risk factor for the development of non-arteritic anterior ischemic optic neuropathy (NAION).
How can I strengthen my optic nerve?
Sit in vajrasana and place a lit candle at some distance from yourself at eye level. Fix your gaze at the tip of the candle’s wick and look at it. Try not to blink and keep the gaze as steady as possible. Allow the tears to flow, if they come.
What color should the optic nerve be?
A normal optic nerve head (ONH) usually is round or oval, mildly elevated and pink in color, with a centralized depression known as the cup. The horizontal diameter of a typical optic nerve is approximately 1.5mm.
What is notching of optic disc?
• Notching of the neuroretinal rim is a sign that a focal area of loss occurred within the rim tissue. Notching most commonly occurs at the inferior temporal or superior temporal aspect of the disc and often is associated with corresponding nerve fiber layer defects.
What is Pseudopapilledema of optic disc?
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.
What is the cup of the optic disc?
The optic disc is the anatomical location of the eye’s “blind spot”, the area where the optic nerve and blood vessels enter the retina. The hole represents the cup and the surrounding area the disc. If the cup fills 1/10 of the disc, the ratio will be 0.1. If it fills 7/10 of the disc, the ratio is 0.7.