During the test, the patient was sitting on a fixed chair and wearing glasses with an integrated camera of the Visual Eyes 525 video oculography system (Interacoustics, Middelfart, Denmark). The participant looked at a wall in front where periodic, vertical, and yellow and blue stripe patterns were presented using a video projector. The patient was asked to observe a stripe in the center of the field and let the eyes follow the movement of the stripe until it disappeared. By then, the eyes jumped back to the center of the field, and the gaze was fixed on a new stripe. The speed of the stripes presented affected the slow phase velocity (SPV) of the eyes, which the stripes can normally follow up to a speed of 40°/s. The nystagmus movements were evaluated by the software system OtoAccessTM (Interacoustics, Middelfart, Denmark). The stimulus speeds used for the right and the left sides were 20, 35, and 50°/s, with a recording time of 20 s. The optokinetic nystagmus was assessed according to Haid et al. (35 ) as irregular if a nystagmus difference between the two eyes of greater than or equal to 20% (of the SPV) was measured to the right and to the left for the same speed. A conspicuous nystagmus difference occurs in patients with central vestibular damage, but not peripheral lesions (35 , 36 ).
Visualeyes 525
Manufactured by Interacoustics
Sourced in Denmark
The VisualEyes 525 is a comprehensive eye movement recording system developed by Interacoustics. It is designed to assess and analyze various eye movement parameters, including saccades, smooth pursuit, and vestibulo-ocular reflex. The system utilizes high-resolution cameras to capture detailed eye movement data, allowing for precise measurements and evaluations.
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Lab products found in correlation
3 protocols using visualeyes 525
1
Optokinetic Nystagmus Assessment Protocol
2
Video-Oculography for Eye Movement Analysis
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VOG VisualEyes 525 from Interacoustics, 2D-VOGfw goggle w. side mounted cameras FireWire(r) camera module (two modules in binocular configuration) Capture Resolution: 640 x 480 Pixels @ 100 fps. Video Resolution: 640 x 240 Pixels @ 25 fps Images: 100 frames per second. Horizontal and Vertical Eye movement measurement resolution: approx. 0.33 degrees. Single IR LED infrared illumination: 950 nm at 1.5 mw/cm 2 . VHIT EyeSeeCam Interacoustics, Monocular camera, interchangeable between left and right eye, Sample rate 220 Hz, Instantaneous gains at 40, 60 and 80 ms -equivalent to scleral search coil method. Data Analysis: Velocity Regression Plot, Gain Plot.
3
Feasibility of Vestibular Evaluation System
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Data from 148 participants were used to construct and test the feasibility of the EVEST. We examined 49 healthy volunteers (28 female and 21 male) and 99 patients(58 female and 41 male)with various degree of unilateral peripheral vestibular deficit divided into two groups, vestibular neuritis and vestibular schwannoma group.The inclusion criterion for the vestibular neuritis group wasunilateral peripheral vestibular lesion without any neurological nor cochlear deficit.The inclusion criterion for the schwannoma group wasanMRI confirmed diagnosis of the vestibular schwannoma. Participants were examined from January 2016 to July 2019 in University Hospital Hradec Kraloveand University Hospital Kralovske Vinohrady, Prague, Czech Republic. All participants underwent complex neuro-otologic examinationperformed by VOGdevice (VisualEyes 525, Interacoustics) and VHITdevice (EyeSeeCam vHIT, Interacoustics).
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