![]() Koetting award, UMSL College of Optometry & Valley Contax Clinical Excellence in Contact Lens Patient Care award, Silver Medal Academic Award, and the Dean’s Award for Outstanding Scholarship. She also obtained her Student Fellowship in the American Academy of Optometry. In school, she was a member of the American Optometric Student Association, Beta Sigma Kappa (an International Optometric Honor Society), Volunteer Optometric Services to Humanity (providing eye care to Haiti in 2019), and the Optometry Scholar’s Program (conducting research on dry eye disease, genetic eye disorders, specialty contact lenses, and a mouse model of glaucoma). Louis (UMSL), graduating at the top of her class. She attended optometry school at the University of Missouri – St. She played tennis for Missouri Western State University, where she graduated summa cum laude with her Bachelors of Science in Biological Sciences. Kelly Deering grew up in the small town of Buckner, MO. Sloan also is a board certified optometrist and Diplomate of the American Board of Optometry.ĭr. Sloan extensively lectures to Optometrists around the nation on the subjects of Practice Management and Contact Lenses. He is Fellow of American Academy of Optometry and multiple award winner of AOA Optometric Recognition Award. He was the past president of Missouri Optometric Association, and Chillicothe Chamber of Commerce. Sloan serves as the company’s managing member. Sloan Eye Care merged with Brodmerkle Family Eye Care in 2004 to form Premier EyeCare Associates, where Dr. In 1973 he established Sloan Eye Care Centers. Sloan practiced in Chillicothe, Hamilton, Cameron, and Brookfield Missouri. After relocating to North Missouri in 1989, Dr. in the Greater Kansas City metropolitan area. Sloan was the Chief of Eye Care of Stadium Care Center and Director of Eye Care for Prime Health H.M.O. He graduated from Illinois College of Optometry, Chicago, Illinois. Robert Sloan attended undergraduate school at the University of Missouri. Shadows are distorted, but they still show the exact silhouette of an object.Dr. If a person were to touch the place where a shadow is being projected, the two shadows would also converge exactly where the point of contact is. This happens because there are no atmospheric effects that diffuse the light. Shadows in outer space are extremely sharp, with clearly visible boundaries and outlines between light and dark. Once we start diffusing the light, the shadows become increasingly softer and lose their outlines, until they completely disappear. The places where they overlap are darker, and can even be of a different color than usual. With more than one light source, we get more shadows. However, the view of the light source would still be blocked by whichever object is responsible for the shadow. The light source partially illuminates the penumbra, so we would be able to see it if we stood there. If we were to stand in the umbra of a shadow, we would not be able to see the parts of the light source directly. The umbra is the darkest part of the shadow because it does not receive any light directly from the source, or any of its parts. We can find the outlines of shadows if we trace the rays of light that come from the outer zones of the light source. Finally, the antumbra is the region where the body that is blocking the light source appears entirely within that same source of light, its disc, to be precise. The penumbra is the region where only a part of the light is obscured. The umbra is the darkest part of a shadow, the one that is at its innermost part. Those parts are umbra, penumbra, and antumbra. If we are talking about a nonpoint source of light, the shadow has three parts. A shadow that is cast by a point source of light is simple and is called an umbra. Light sources are separated into a point and nonpoint sources. A shadow is a reverse projection of whatever object is placed in front of a light source. If we took a look at a cross-section of a shadow, we would see that it looks like a flat silhouette. Shadows normally take up the entirety of the three-dimensional volume of the space behind the object. This object needs to be opaque, which means that it is impenetrable to electromagnetic radiation, most notably light. But have you stopped to think about what they are exactly? And how would we define them? The easiest way to describe shadows is as dark areas where an object blocks the light that is coming from a light source. Shadows are everywhere around us we see them almost constantly.
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