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Polycoria is a pathological condition of the eye characterized by more than one pupillary opening in the iris. [1] It may be congenital or result from a disease affecting the iris. [ 1 ] It results in decreased function of the iris and pupil, affecting the physical eye and visualization.
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To see it, one must be in a dark room, with one eye closed; one must look straight ahead while moving a light back and forth in the field of the open eye. Then one should see the sixth Purkinje as a dimmer image moving in the opposite direction. The Purkinje tree is an image of the retinal blood vessels in one's own eye, first described by ...
The person then closes one eye, and then the other. The person should notice that the target appears larger to the eye that it is directly in front of. When this object is viewed with both eyes, it is seen with a small amount of aniseikonia. The principles behind this demonstration are relative distance magnification (closer objects appear ...
A coloboma (from the Greek κολόβωμα, meaning "defect") [1] is a hole in one of the structures of the eye, such as the iris, retina, choroid, or optic disc.The hole is present from birth and can be caused when a gap called the choroid fissure, which is present during early stages of prenatal development, fails to close up completely before a child is born.
As most cat owners surely know by now, receiving a slow blink from your cat is a great honor; in cat terms, shutting your eyes for any length of times means that you're feeling comfortable in that ...
One of my cats often walks around with one eye swollen and shut due to a birth defect that occasionally causes her trouble. Perhaps one day she will be a one-eyed cat like Ivy, but she’ll be all ...
It is now one of five active fires in the area.. As of Thursday morning, the fire had multiplied in size, spread to at least 17,234 acres and was 0% contained, with an expectation that its going ...