Visual Perception in stroke patients is very important in the respect of prognosis and functional recovery. Therefore understanding and knowledge of the visual perceptual dysfuction should be the base for the training in activities of daily living.

The present study was designed to test the disturbance of visual perceptions, espescially for error in visual perception of verticality or horizontality of rod in hemiplegic patients.

In additions, we assessed the hemiplegic and control groups, for the balance index, the duration of disease onset, and the lateralization and localization of lesions by computerized tomography or magnetic resonance image respectively with analysis of an each factor.

The vertical average error angles of hemiplegic patients are greater than those of controls. The error angles of the left hemiplegic patients are greater than those of the right hemiplegia. Correlation between the vertical average error angles and the balance index has the reversed coefficient factors. Verticality recovers mostly in 2∼3 months of onset.

Keywords :Verticality, Horizontality, Stroke, Balance