Mezey L E, Harris C M, Shawkat F S, Timms C, Kriss A, West P, Taylor D S
Department of Ophthalmology, Great Ormond Street Hospital for Children, London, UK.
Dev Med Child Neurol. 1998 Sep;40(9):626-30. doi: 10.1111/j.1469-8749.1998.tb15429.x.
Multiple hypometric (undershooting) saccades are generally reported as a compensatory strategy in adults with homonymous hemianopia. However, hypermetric (overshooting) saccades have been reported to develop spontaneously as a beneficial strategy in response to predictable targets. We examined the saccades of 10 children (aged 5 to 16 years) with homonymous hemianopia to determine the type of compensatory eye-movement strategies employed 6 months to 16 years after hemianopia onset. Homonymous hemianopia was identified using perimetry and/or pattern visual evoked potentials and supported with results of neuroimaging. Eye movements were recorded using bitemporal electrooculography. Saccades were elicited to a red light source in a semipredictable paradigm. We found that hypermetria was not a consistent compensatory strategy in our patients. In spite of the predictability of our paradigm and the long follow-up period, multiple hypometric saccades into the blind field appeared to be the preferred strategy.
在同向性偏盲的成年人中，多次低度量（下冲）扫视通常被报告为一种代偿策略。然而，据报道，在面对可预测目标时，超度量（上冲）扫视会自发形成一种有益的策略。我们研究了10名同向性偏盲儿童（年龄在5至16岁之间）的扫视情况，以确定在偏盲发作后6个月至16年所采用的代偿性眼球运动策略类型。通过视野检查和/或图形视觉诱发电位确定同向性偏盲，并得到神经影像学结果的支持。使用双颞侧眼电图记录眼球运动。在半可预测范式中，向红色光源诱发扫视。我们发现，在我们的患者中，度量过度并非一种一致的代偿策略。尽管我们的范式具有可预测性且随访期较长，但多次向盲视野的低度量扫视似乎是首选策略。
