方法：随机选取就诊前1mo内使用掌中视频设备的门诊患者591例1182眼，调查患者使用智能手机、平板电脑等掌中视频设备的强度，行裂隙灯下角膜荧光染色观察泪膜破裂时间(break-up time，BUT)，描述该病的临床特点，并分析其发病率与泪膜破裂时间和患者用眼强度之间的相关性。

结果：掌中视频性角膜炎好发于20～40岁的中青年人，无明显性别差异。其发病与微生物感染和免疫性炎症无关。发病率随患者用眼强度的增加而明显上升，且与患者的用眼强度呈强正性相关，而随患者泪膜破裂时间的延长而下降，与患者的泪膜破裂时间呈强负性相关。

结论：双眼长时间地向前下方注视掌中视频设备，造成眼表泪膜性状改变，是发病的重要原因。减少掌中视屏的使用可积极治疗和预防本病。

METHODS:A total of 591 patients were randomly selected. Firstly, the frequency of staring at palm video equipment were investigated and break-up time of tear film with slit-lamp were observed. Then the data were calculated and the clinical characteristics were described. Finally, the correlation between incidence rate and the two factors were analyzed by SPSS13.0 respectively.

RESULTS:The incidence rate of palm video keratitis increased along with the frequency of staring at palm video equipment and decreased along with break-up time. There was significant relationship between incidence rate and the two factors respectively.

CONCLUSION:It is the most important pathogeny that staring at palm video equipment ahead and down for a long time which cause the change of tear film. That can reduce the frequency of using palm equipment and drop artificial tears to prevent and cure the disease.