Dvat 2025

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Dynamic visual acuity (DVA) is defined as the ability to identify the details of visual targets when there are relative movements between the subjects and objects.
Visual acuity itself is abbreviated V or VA. It may also be abbreviated as DVA, or VAd, with the D meaning distance. Near visual acuity (NV, NVA, or VAn) is tested by the patient reading from a card held 14 to 16 inches (35 to 40 cm) from the face.
DVA measures target recognition during a state of relative motion between the observer and the target. It is the ability to perceive targets moving horizontally or vertically on a two dimensional plane. The movement can be predictable or random.
The non-instrumented Dynamic Visual Acuity Test (DVAT NI) assesses gaze stability during sinusoidal, examiner mediated head rotations relative to head-stationary visual acuity. To administer this test, visual acuity is first assessed under static head movement conditions (i.e.: no head movement).
Dynamic Visual Acuity (DVA) is a behavioral assessment of the Vestibulo-Ocular Reflex (VOR) in response to head movements. During the test, patients move their heads at a consistent speed, while an optotype decreases in size until the software detects the DVA threshold.
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Mean DVA score across all ages in the normative population was 0.116 0.184 logMAR.
Visual acuity during head movements improves with vestibular compensation. So, the aim of DVA testing is to compare visual acuity for when the head is still with the visual acuity for when the head is moving. The test can then be used to evaluate the level of vestibular compensation.

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