منابع مشابه
Symptomatic Rathke’s Cleft Cyst Presenting With Decreased Visual Acuity
Background and Importance: Symptomatic Rathke’s cleft cyst is a rare lesion that often presents without any symptoms. Case Presentation: We report a 40-year-old female with symptomatic Rathke’s cleft cyst located in the sellar and suprasellar region. She presented with visual disturbance, headache, weight gain, hypothyroidism and amenorrhea. The patient underwent surgery and ...
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The present study used previously developed techniques to measure resolution acuity in bumblebees (Bombus impatiens). Bees were required to discriminate between horizontal and vertical gratings in a Y-maze apparatus. The gratings had a mean luminance of 9 cd m(-)(2) and a Michelson contrast of 84 %. For different bees, either the horizontal or vertical grating was rewarded. Rewarded gratings we...
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We have developed a simple computer-based discrimination task that enables the quick determination of visual acuities in rodents. A grating is displayed randomly on one of two monitors at the wide end of a trapezoidal-shaped tank containing shallow water. Animals are trained to swim toward the screens, and at a fixed distance, choose the screen displaying the grating and escape to a submerged p...
متن کاملObjective assessment of visual acuity by induction of optokinetic nystagmus.
Optokinetic nystagmus is the term applied to the nystagmus evoked by a succession of moving objects passing before the eyes (Brain, 1962). It has proved useful as a diagnostic tool in the examination of patients with neurological disease (Cogan, 1956; Huber, 1961; Smith, 1963; Walsh, 1957). Methods of inducing and suppressing optokinetic nystagmus have also been used as the basis for objective ...
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Assessment and management of visual disorders in children with physical and/or intellectual impairment present a complex challenge to the clinician. A comprehensive review of all aspects of vision care in multiply handicapped children is too diverse to address in a single review. This review will focus on the techniques which have been developed for visual acuity assessment in this challenging ...
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ژورنال
عنوان ژورنال: Eye
سال: 1993
ISSN: 0950-222X,1476-5454
DOI: 10.1038/eye.1993.6