Avaliação oculomotora em pacientes com disfunção vestibular periférica

Abstract

Ai m: To assess whether or not the parameters of fixed and randomized saccadic movements, of pendular tracking and of optokinetic nystagmus in the digital vectonystagmography may show abnormalities in patients with possible diagnosis of peripheral vestibular dysfunction. Method: 60 patients with dizziness of peripheral vestibular origin, from 12 to 82 years of age, males and females, were evaluated in the Universidade Federal de São Paulo. Ocular movement parameter findings were compared to a normal pattern. Results: Fixed saccadic movements were altered in 100% of the cases as to latency, and in 35.0% of the cases as to speed; the randomized saccadic movements were altered in 100% of the cases as to latency, in 78.3% as to precision, and in 1.7% as to speed; the pendular tracking showed a gain alteration in the frequencies of 0.1 Hz in 15% of the cases, 0.2 Hz in 21.7%, and 0.4 Hz in 13.3%; the optokinetic nystagmus showed an alteration of the angular speed in the slow component in 1.7% of the cases, and in gain in 5.0%. Conclusion: Fixed saccadic movement latency and speed, randomized saccadic movement latency, precision and speed, pendular tracking gain, slow component angular speed, and optokinetic nystagmus gain in the digital vectonystagmography may show abnormalities in patients with possible diagnosis of peripheral vestibular dysfunction.

Controle postural e sistema vestíbulo-oculomotor em atletas de tiro esportivo da modalidade pistola

“…In sports, suitable posture assessment produces data about the functional capacity of the athlete, besides identifying specific alterations which compromise their posture control and consequent performance. Balance, sensory characteristics and vestibular system examinations get together as useful instruments in this investigation 6,8,10,24,26,27 . In sport shooting and similar modalities, as arch shooting, the posture examination has been approached for performance improvement, injury investigation and alterations associated with this class of sport 17,18,22,[28][29][30] .…”

A influência da oculomotricidade e do reflexo-vestíbulo-ocular na leitura e escrita

“…The registration of saccadic abnormalities is important to help diagnose related with various central nervous system pathologies, involving oculomotor areas 26 . The saccadic pathway involves regions of the cerebral cortex, cerebellum and brainstem and few disorders affecting the central nervous system can not be detected in the saccadic eye movement record 27 . The unanimous alteration of saccades in RWD group showed the difficulty of these subjects to track a target in space, and may have difficulty in reading and writing, they are skills that require eye movements in search of letters on paper 7,14 .…”

The Effect of Alcohol in Visuospatial Perception and Spatial Cognition

“…Os movimentos oculares de perseguição lenta dizem respeito à capacidade de se manter a estabilidade da imagem de um alvo em movimento na fóvea, sendo que, alterações na velocidade deste movimento são indicadoras de possíveis disfunções do tronco encefálico. Por outro lado, os movimentos sacádicos dos olhos possibilitam que as imagens dos objetos sejam posicionadas sobre a fóvea e sua avaliação permite verificar a eficiência do SNC no controle dos movimentos rápidos dos olhos (Tuma et al, 2006). Observou-se uma diminuição no ganho de perseguição lenta, smooth pursuit gain, e um aumento no movimento sacádico dos olhos, à medida que se aumentava a concentração de álcool no sangue.…”