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The prism fusion range (PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists, optometrists, and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision in the presence of increasing vergence demands.
The symptoms and signs associated with convergence insufficiency are related to prolonged, visually demanding, near-centered tasks. They may include, but are not limited to, diplopia (double vision), asthenopia (eye strain), transient blurred vision, difficulty sustaining near-visual function, abnormal fatigue, headache, and abnormal postural adaptation, among others.
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In this equation, the base (B) and the extremely strong base (the conjugate base OH −) compete for the proton. [6] As a result, bases that react with water have relatively small equilibrium constant values. [6] The base is weaker when it has a lower equilibrium constant value. [3]
Variable prism stereoscope WD Working distance X/12 ... X/7 X days XP Exophoria: XT Exotropia: Clinical conditions terms. Abbreviation ... Base curve: BOZD Back optic ...
German tanks of the Neubaufahrzeug type in Oslo in April 1940. Germany invaded both Norway and Denmark on 9 April 1940. [1] Norway was very important to Germany for two reasons: firstly as a base for naval units to harass Allied shipping in the North Atlantic and Arctic Oceans, and secondly to secure shipments of iron ore coming in from Sweden through the port of Narvik. [2]
In geometry, a triangular prism or trigonal prism [1] is a prism with 2 triangular bases. If the edges pair with each triangle's vertex and if they are perpendicular to the base, it is a right triangular prism. A right triangular prism may be both semiregular and uniform. The triangular prism can be used in constructing another polyhedron.
The patient is asked to fixate on a target while the examiner places a 4 prism dioptre base-out prism over the patient's eye, observing the response of the fellow eye. [ 1 ] The target is a single isolated distance target of approximately 1-2 lines better than best corrected acuity at distance.