What is optic disc segmentation?
Segmenting the optic disc (OD) is an important and essential step in creating a frame of reference for diagnosing optic nerve head pathologies such as glaucoma. Therefore, a reliable OD segmentation technique is necessary for automatic screening of optic nerve head abnormalities.
What is the function of the optic cup?
The optic cup gives rise to the entire globe, along with its associated inner structures except for the lens, which includes the ten layers of the retina that contains rods, cones, bipolar cells, amacrine cells, horizontal cells, and the complex interplay between these cells that help process photons into three- …
What is the difference between optic disc and cup?
Optic Cup is the bright central part of the optic disc and which is an essential parameter for detecting glaucoma. Compared to the optic disc, the optic cup is smaller in size. For a healthy patient, the optic cup shape is one-third of the optic disc.
What is optic cup in retina?
The optic cup is the white, cup-like area in the center of the optic disc. Optic cup. Wiggle stereogram showing the optic cup in a healthy eye. Details.
How is the optic cup formed?
During embryonic development of the eye, the outer wall of the bulb of the optic vesicles becomes thickened and invaginated, and the bulb is thus converted into a cup, the optic cup (or ophthalmic cup), consisting of two strata of cells.
How optic cup is formed?
Where is optic cup derived?
As the optic cup has its origins as a continuous layer of the surface of the forebrain we can directly describe the choroid and the sclera as being ‘like’ the pia mater and the dura mater of the brain. These develop from the mesenchyme immediately adjacent to the posterior part of the developing eye.
Why does optic disc cupping happen?
Individuals with glaucoma have increased IOP or consequent loss of blood flow to some regions of the eye, resulting in the death of optic nerve cells. The center of the optic disc (known as the cup) becomes larger, and the cup to optic disc ratio increases alarmingly. This process is referred to as optic nerve cupping.
What causes eye cupping?
OPTIC DISC CUPPING. A hallmark of glaucoma is excavation or enlargement of the optic disc, referred to as cupping. The vast majority of pathologic cupping is caused by glaucoma. Disc cupping in the absence of elevated IOP may be caused by normal-tension glaucoma, which accounts for 20% to 30% of open-angle glaucoma.
What is the optic cup made of?
How is optic cup formed?
What is the optic disc and what is its significance?
The optic disc represents the beginning of the optic nerve (second cranial 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.
What develops from optic groove?
Through a groove at the bottom of the optic vesicle known as choroid fissure the blood vessels enter the eye. Several layers such as the neural tube, neural crest, surface ectoderm, and mesoderm contribute to the development of the eye.
What is optic cup made of?
How can I stop my optic nerve cupping?
Treatment of Optic Nerve Cupping in Glaucoma Using medical treatments to lower the IOP will also help to reduce further damage to the optic nerve fibers within the optical disc. Laser trabeculoplasty is a procedure that can lower the IOP in glaucoma patients.
Can optic nerve cupping reversed?
Interpretation: Optic disc cupping can be reversed at an early stage of primary congenital glaucoma following successful reduction of IOP. Younger age at surgery was associated with reversal of cupping.
Is optic nerve cupping reversible?
Is cupping good for eyes?
Facial cupping promotes circulation, which may help minimize the appearance of fine lines and wrinkles, decrease puffiness, and more.
Where does the optic cup develop from?
mesenchyme
As the optic cup has its origins as a continuous layer of the surface of the forebrain we can directly describe the choroid and the sclera as being ‘like’ the pia mater and the dura mater of the brain. These develop from the mesenchyme immediately adjacent to the posterior part of the developing eye.
What is accurate optic disc and optic cup segmentation?
Accurate optic disc (OD) and optic cup (OC) segmentation is the premise for precise CDR computation and a guarantee for correct glaucoma screening and diagnosis. In general, CDR is obtained by means of manually delineating the borders of the OD/OC or manually correcting the contours produced by segmentation algorithms [ 6, 7, 8 ].
What is the threshold value for segmentation of optic disc?
This value is used to set the threshold for optic disc segmentation. 10% of this is used to segment optic disc and 1/40 th part is used for segmenting optic cup. Circular Hough transform is used to find the center and radius of the segmented cup and disc.
Does Cup-to-disc ratio measure glaucoma screening?
The Cup-to-Disc ratio (CDR) of the optic nerve head, which measures the vertical diameter of the optic cup to that of the disc, is among one of the most commonly adopted screening tests for glaucoma ( Kumar et al., 2007 ).
How many pixels are needed to segment the optic disc?
This is the number of pixels that are needed for segmentation. This value is used to set the threshold for optic disc segmentation. 10% of this is used to segment optic disc and 1/40 th part is used for segmenting optic cup. Circular Hough transform is used to find the center and radius of the segmented cup and disc.