Foveation dynamics in congenital nystagmus IV: vergence
| Autor: | Louis F. Dell'Osso, Robert M. Steinman, Han Collewijn, Johannes van der Steen |
|---|---|
| Přispěvatelé: | Neurosciences |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Male
Fovea Centralis Eye Movements genetic structures Computer science Visual Acuity Vergence eye movements Nystagmus 03 medical and health sciences 0302 clinical medicine Physiology (medical) Electroretinography medicine Humans Computer vision Longitudinal Studies Magnetic search coil business.industry Infantile nystagmus syndrome Eye movement Convergence Ocular Middle Aged Magnetic Resonance Imaging eye diseases Sensory Systems Ophthalmology Fixation (visual) 030221 ophthalmology & optometry Artificial intelligence medicine.symptom business Nystagmus Congenital 030217 neurology & neurosurgery Congenital nystagmus |
| Zdroj: | Documenta Ophthalmologica, 140(3), 221-232. Springer Netherlands |
| ISSN: | 0012-4486 |
| Popis: | To evaluate foveation dynamics and characteristics of vergence eye movements during fixation of static targets at different distances and while tracking a target moving in depth in a subject with congenital nystagmus (CN). Eye movements of a well-studied subject with CN were recorded using the magnetic search coil technique and analyzed using the OMtools software, including the eXpanded Nystagmus Acuity Function (NAFX). Both the phase planes and NAFX values during fixation of targets at various near distances were equivalent to those during fixation of a far target. When applied to vergence data, the NAFX values (“binocular” NAFX) were higher than for the individual eye data. Vergence tracking of targets moving in depth was demonstrated and was accurate for targets moving at speeds up to ~ 35°/sec. Target foveation qualities during fixation of targets at various near distances were equivalent to that during fixation of a far target. Stereo discrimination was limited by the foveation quality of the eye with the higher NAFX waveform. Foveation period slopes during vergence tracking demonstrated vergence movements despite the ongoing CN oscillation. Similar to what we found with fixation, pursuit, and the vestibulo-ocular systems, these findings establish that vergence in both static and dynamic viewing conditions functions normally in the presence of the CN oscillation. |
| Databáze: | OpenAIRE |
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