What is Morning Glory disc?
Description: Morning glory disc anomaly is a congenital malformation of the optic nerve characterized by an enlarged optic disk opening and excavation of the peripapillary fundus with outward radiating papillary vessels, the appearance of which resembles the morning glory flower.
What does the optic disc do in the eye?
Optic disc: the visible (when the eye is examined) portion of the optic nerve, also found on the retina. The optic disc identifies the start of the optic nerve where messages from cone and rod cells leave the eye via nerve fibres to the optic centre of the brain. This area is also known as the ‘blind spot’.
What is optic disc coloboma?
Optic disc coloboma (ODC) is a rare congenital defect resulting from incomplete proximal optic fissure closure [1, 2]. It may occur as an isolated finding or associated with other eye colobomas, including coloboma of the lens, iris coloboma, and retinochoroidal coloboma [3].
What is optic disc pit?
Optic Pits (also known as optic nerve pits, optic disc pits, or less commonly optic holes) are congenital defects presumably arising from the failure of fetal fissure closure in embryogenesis.
Why is the optic disk a blind spot?
blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area.
How does coloboma affect the eye?
Colobomas involving the retina result in vision loss in specific parts of the visual field. Large retinal colobomas or those affecting the optic nerve can cause low vision, which means vision loss that cannot be completely corrected with glasses or contact lenses.
What causes optic disc pit?
What is the blind spot and why is it so called?
Everyone has a spot in the retina where the optic nerve connects. In this area, there are no light sensitive cells, so this part of your retina cannot see. We call this the blind spot. Your blind spot is not usually noticeable because your two eyes work together to cover up each eye’s blind spot.
Why is the optic disc pink?
The normal optic disc is pink in color due to the fact that light entering the optic disc is conducted along the transparent nerve fibers and they diffuse among columns of glial tissue and capillaries.
How does the brain compensate for the blind spot?
This is how we know what we’re seeing. Our eyes see the object or image, and our brain interprets it. Our brains typically fill in any information we need based on the images surrounding our blind spot, so we don’t usually notice it. Side-view mirrors on cars are a good example of how we compensate for our blind spots.
What do coloboma people see?
Coloboma can affect your iris, the tissue that gives you your eye colour. Your pupil may look oval if the coloboma is partial, but if more of your lower iris is missing, your pupil will look more keyhole shaped. Both children and adults with only iris coloboma will probably have fairly good vision.