What does the optic disc do?

What does the optic disc do?

The optic disc is the round spot on the retina formed by the passage of the axons of the retinal ganglion cells, which transfer signals from the photoreceptors of the eye to the optic nerve, allowing us to see.

What is eye disc?

The optic disc or optic nerve head is the point of exit for ganglion cell axons leaving the eye. Because there are no rods or cones overlying the optic disc, it corresponds to a small blind spot in each eye. The optic disc in a normal human eye carries 1ā€“1.2 million afferent nerve fibers from the eye towards the brain.

What is the optic disk psychology definition?

the area of the retina at which the axons of the retinal ganglion cells gather before leaving the retina to form the optic nerve. Because this region contains no photoreceptors, it creates a blind spot in the visual field.

What is optic cup and disc?

Anatomical terminology The optic cup is the white, cup-like area in the center of the optic disc. The ratio of the size of the optic cup to the optic disc (cup-to-disc ratio, or C/D) is one measure used in the diagnosis of glaucoma. Different C/Ds can be measured horizontally or vertically in the same patient.

What is another name for the optic disc?

4.3 Optic disc (or ONH), macula and fovea: Detection and segmentation. The optic disc (OD), also termed as optic nerve head (ONH), is the point where the retinal vessels originate.

Why is it called the blind spot?

In this tiny area, where the optic nerve passes through the surface of the retina, there are no photoreceptors. Since there are no photoreceptor cells detecting light, it creates a blind spot.

What does mean blind spots?

countable noun. If you say that someone has a blind spot about something, you mean that they seem to be unable to understand it or to see how important it is.

How do I test my optic disc?

Ophthalmoscopy. During this examination, your doctor shines a bright light into your eye and examines the structures at the back of your eye. This eye test evaluates the optic disk, where the optic nerve enters the retina in your eye. The optic disk becomes swollen in about one-third of people with optic neuritis.

What does optic disc mean?

The optic disc represents the beginning of the optic nerve and is the point where the axons of retinal ganglion cells come together. The optic disc is also the entry point for the major blood vessels that supply the retina. The optic disc in a normal human eye carries 1ā€“1.2 million afferent nerve fibers from the eye towards the brain.

What is the difference between an optical disk and a CD-DVD?

Difference Between CD and DVD The CD and DVD are the versions of an optical disk which mainly differ in size and manufacturing method. Generally, a DVD can store more data than a CD, its one of the reason is that CD contain the polycarbonate substrate on only a single side while in DVDs it present on both of the sides.

What is the structure and function of the optic disc?

The optic disc is where the retinal aqueous and vitreous humor enter and exit the eyeball and where the optic nerve enters and exits the eyeball . The optical disc has no photoreceptors, and therefore marks the blind spot of the eye.

What is the definition of optical disk?

optical disk. optical disc. A plastic-coated disk that stores digital data, such as music or text, as tiny pits on its surface. The disc is rotated rapidly, and a laser is reflected off the disc to an optical sensor, which is sampled periodically.