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Diplopia. Diplopia. Other names. Double vision. One way a person might experience double vision. Specialty. Neurology, ophthalmology. Diplopia is the simultaneous perception of two images of a single object that may be displaced horizontally or vertically in relation to each other. [ 1] Also called double vision, it is a loss of visual focus ...
Hydrocephalus is a condition in which an accumulation of cerebrospinal fluid (CSF) occurs within the brain. [ 1] This typically causes increased pressure inside the skull. Older people may have headaches, double vision, poor balance, urinary incontinence, personality changes, or mental impairment.
In order to see a clear image, the eye must focus rays of light on to the light-sensing part of the eye - the retina, which is located in the back of the eye.This focusing - called refraction - is performed mainly by the cornea and the lens, which are located at the front of the eye, the anterior segment.
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Aberrations of the eye. The eye, like any other optical system, suffers from a number of specific optical aberrations. The optical quality of the eye is limited by optical aberrations, diffraction and scatter. [1] Correction of spherocylindrical refractive errors has been possible for nearly two centuries following Airy's development of methods ...
Perfective aspect. The perfective aspect ( abbreviated PFV ), sometimes called the aoristic aspect, [1] is a grammatical aspect that describes an action viewed as a simple whole, i.e., a unit without interior composition. The perfective aspect is distinguished from the imperfective aspect, which presents an event as having internal structure ...
At the centre of Stonehenge lies the Altar Stone, a hefty slab of sandstone whose origin and purpose have been among the famed megalithic monument's enduring mysteries. Its geochemical fingerprint ...
The present perfect is a grammatical combination of the present tense and perfect aspect that is used to express a past event that has present consequences. [ 1] The term is used particularly in the context of English grammar to refer to forms like "I have finished". The forms are present because they use the present tense of the auxiliary verb ...