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Diffraction spikes are lines radiating from bright light sources, causing what is known as the starburst effect [1] or sunstars [2] in photographs and in vision. They are artifacts caused by light diffracting around the support vanes of the secondary mirror in reflecting telescopes , or edges of non-circular camera apertures , and around ...
It is light-sensitive and communicates visual messages to the brain. If the retina detaches, it moves and shifts from its normal position. This can cause photopsia, but can also cause permanent vision loss. Medical attention is needed to prevent vision loss. Procedures may include laser treatment, freezing, or surgery.
Portland is a city in Ashley County, Arkansas, United States. [2] The population was 430 at the 2010 census . [ 3 ] Portland was first settled in the 1830s, and named for its early status as a steamboat port.
Location of Hot Spring County in Arkansas. This is a list of the National Register of Historic Places listings in Hot Spring County, Arkansas. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Hot Spring County, Arkansas, United States. The locations of National Register ...
Messier 82 (also known as NGC 3034, Cigar Galaxy or M82) is a starburst galaxy approximately 12 million light-years away in the constellation Ursa Major.It is the second-largest member of the M81 Group, with the D 25 isophotal diameter of 12.52 kiloparsecs (40,800 light-years).
Providence Portland Medical Center, located at 4805 NE Glisan St. in the North Tabor neighborhood of Portland, Oregon, is a full-service medical center specializing in cancer and cardiac care. Opened in 1941, the hospital is licensed for 483 beds, and has over 3,000 employees. There are approximately 1,000 physicians on staff.
Many variations occur, but scintillating scotoma usually begins as a spot of flickering light near or in the center of the visual field, which prevents vision within the scotoma area. It typically affects both eyes, as it is not a problem specific to one eye. [5] [6] The affected area flickers but is not dark. It then gradually expands outward ...
Glory around the shadow of a plane. The position of the glory's centre shows that the observer was in front of the wings. A glory is an optical phenomenon, resembling an iconic saint's halo around the shadow of the observer's head, caused by sunlight or (more rarely) moonlight interacting with the tiny water droplets that comprise mist or clouds.