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The cup-to-disc ratio compares the diameter of the cup portion of the optic disc with the total diameter of the optic disc. A good analogy to better understand the cup-to-disc ratio is the ratio of a donut hole to a donut. 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.
Cup–disc ratio CF: Count fingers vision – state distance c/o or c.o. ... Visual acuity with Distant chart with correctors Visual acuity with eye chart at Distant ...
The term "disc-at-risk" refers to an optic nerve head characterized by a small cup-to-disc ratio and a crowding of optic nerve fibers. This anatomical feature is a significant factor in the development of NAION. [4] [5] Individuals predisposed to this condition typically have smaller optic discs with minimal or no cupping. This anatomical ...
The interpretation of fundus photographs that are glaucomatous must contain a description of the vertical and horizontal cup to disc ratio, vessel pattern, diffuse or focal pallor, asymmetry and development of the above factors. The retinal nerve fibre layer should also be studied and commented on. [23]
Changes on ophthalmologic exam include deepening and enlargement of the optic cup (leading to a high cup/disc ratio), a more vertical oval optic cup shape, pallor of the disc, and an increase in the blood vessels within the optic nerve on the nasal side of the disc.
A rotary atomizer comprises a rotating surface. This surface can be in the form of a flat or a vaned disc, a cup, or a slotted wheel. A basic rotary atomizer is displayed in the figure. The liquid first flows radially outwards in the disc and is then released from the disc's outer limits at a relatively very high speed.
an increase in the cup-to-disc ratio in the eye; cupping artifact in a CT scan; Other. Cupping therapy, an alternative health practice and pseudoscience;
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