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The Prentice position is an orientation of a prism, used in optics, optometry and ophthalmology. [1] In this position, named after the optician Charles F. Prentice, the prism is oriented such that light enters it at an angle of 90° to the first surface, so that the beam does not refract at that surface. All the deviation caused by the prism ...
Optics and vision. Vision of humans and other organisms depends on several organs such as the lens of the eye, and any vision correcting devices, which use optics to focus the image. The eyes of many animals contains a lens that focuses the light of its surroundings onto the retina of the eye. This lens is essential to producing clear images ...
Moon dog. Pair of moon dogs. Partial Moon dog seen from Hillspeak, Shimla, Lower Himalayas. A moon dog (or moondog) or mock moon, also called a paraselene [1] (plural paraselenae) in meteorology, is an atmospheric optical phenomenon that consists of a bright spot to one or both sides of the Moon. They are exactly analogous to sun dogs .
557. Opened. 1982. Closed. 2022. Managed by. New York State Department of Corrections and Community Supervision. Ogdensburg Correctional Facility was a medium-security state prison for male prisoners, located in the northern part of St. Lawrence County, New York, United States. The prison is located in the northeast corner of Ogdensburg near ...
By measuring this zone, the autorefractor can determine when a patient's eye properly focuses an image. The instrument changes its magnification until the image comes into focus. The process is repeated in at least three meridians of the eye and the autorefractor calculates the refraction of the eye, sphere, cylinder and axis.
A sun dog (or sundog) or mock sun, also called a parhelion [1] (plural parhelia) in meteorology, is an atmospheric optical phenomenon that consists of a bright spot to one or both sides of the Sun. Two sun dogs often flank the Sun within a 22° halo . The sun dog is a member of the family of halos caused by the refraction of sunlight by ice ...
Cover test. A cover test or cover-uncover test is an objective determination of the presence and amount of ocular deviation. It is typically performed by orthoptists, ophthalmologists and optometrists during eye examinations . The two primary types of cover tests are: the alternating cover test. the unilateral cover test (or the cover-uncover ...
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