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The standard measurement for underwater visibility is the distance at which a Secchi disc can be seen. The range of underwater vision is usually limited by turbidity. In very clear water visibility may extend as far as about 80m, [18] and a record Secchi depth of 79 m has been reported from a coastal polynya of the Eastern Weddell Sea ...
Guide dogs are assistance dogs trained to lead blind and visually impaired people around obstacles. In the United States, the name "seeing eye dog" is only used in reference to a guide dog from The Seeing Eye in Morristown, New Jersey, which has trademarked the term. [1] Guide dog schools are accredited by the International Guide Dog Federation.
The Columbus Zoo and Aquarium is a non-profit zoo located near Powell in Liberty Township, Delaware County, Ohio, United States, north of the city of Columbus. The land lies along the eastern banks of the O'Shaughnessy Reservoir on the Scioto River , at the intersection of Riverside Drive and Powell Road.
However, Shola, an English Shepherd who was forced to retire as a mountain rescue dog due to the condition, has helped scientists create a new test that could mean the end of PRA.
Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies. In this, distances vary for individuals from the far point—the maximum distance from the eye for which a clear image of an object can be seen, to the near point—the minimum distance for a ...
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Water surface searches are procedures carried out on or over the surface of a body of water with the purpose of finding lost vessels, persons, or floating objects, which may use one or more of a variety of search patterns depending on the target of the search, as the direction and rate of drift vary depending on the characteristics of the target and the water and weather conditions at the time.
"It's 20 points if the officer does it," one judge joked after one of the dogs took a break in the middle of his evidence collection test. Each dog has to score 490 out of 700, or 70%, to pass ...