Mezawa M, Ishikawa S, Ukai K
Department of Ophthalmology, School of Medicine, Kitasato University, Kanagawa, Japan.
Br J Ophthalmol. 1990 Aug;74(8):472-6. doi: 10.1136/bjo.74.8.472.
A study was made of parameters of congenital nystagmus which responded to auditory biofeedback treatment. The parameters studied included foveation time, amplitude, and frequency. The patient's right retina was observed with an infrared television fundus camera, and the fundus image was recorded on video tape. The position of the eye during nystagmus, observed via the fundus camera and recorded on video, was analysed at every 1/60 second intervals. The displacement in degrees between the fixation target, projected on to the retina, and the foveola was measured for each interval. Using biofeedback, the subjects could voluntarily suppress nystagmus and prolong foveation time. A damping of the nystagmus amplitude, intensity, and frequency was observed. On the average the intensity decreased by about 40%, and the foveation time was prolonged by about 190%. After completion of the training all the patients reported a subjective improvement in their vision when suppressing their nystagmus. Possibly biofeedback training acts to reduce the nystagmus and extend foveation time, thereby improving the ability to fixate.
对先天性眼球震颤中对听觉生物反馈治疗有反应的参数进行了一项研究。所研究的参数包括注视时间、振幅和频率。用红外电视眼底照相机观察患者的右眼视网膜，并将眼底图像记录在录像带上。通过眼底照相机观察并记录在视频中的眼球震颤期间眼睛的位置，每隔1/60秒进行一次分析。测量每个时间间隔内投射到视网膜上的注视目标与中央凹之间的度数位移。通过生物反馈，受试者可以自愿抑制眼球震颤并延长注视时间。观察到眼球震颤的振幅、强度和频率有衰减。平均而言，强度降低了约40%，注视时间延长了约190%。训练完成后，所有患者在抑制眼球震颤时均报告视力有主观改善。生物反馈训练可能起到减少眼球震颤和延长注视时间的作用，从而提高注视能力。
