Infantile nystagmus adapts to visual demand.

摘要: purpose. To determine the effect of visual demand on nystagmus waveform. Individuals with infantile syndrome (INS) commonly report that making an effort to see can intensify their and adversely affect vision. However, such has never been confirmed experimentally. methods. The eye movement behavior 11 subjects INS were recorded at different gaze angles while viewed targets under two conditions: above then resolution threshold. Eye movements by infrared oculography acuity (VA) was measured using Landolt C a two-alternative, forced-choice (2AFC) staircase procedure. data analyzed null zone for changes in amplitude, frequency, intensity, foveation characteristics. Waveform type also noted conditions. results. Data from revealed significant reduction amplitude (P < 0.05), frequency intensity 0.01) when target size percentage time spent within low-velocity window (i.e., foveation) significantly increased threshold 0.05). Furthermore, change waveform exhibited subjects. conclusions. results indicate modifies favorably (and possibly adaptively), producing prolonged foveation. These findings contradict previous anecdotal reports intensifies cost performance. This discrepancy may be attributable lack psychological stress involved task reported here. is consistent suggestion it importance individual rather than per se which exacerbates INS. Further studies are needed investigate quantitatively effects factors waveforms.