屏气对非接触眼压计测量值的影响

目的探讨屏气对非接触眼压计测量结果的影响。方法对非青光眼患者60例(60眼)分别于常规状态,屏气10 s后及屏气30 s后行非接触眼压计测量眼压,分析不同状态下的眼压测量值差异以及其相关关系。结果受试者60眼测量结果常规平静呼吸状态下60眼眼压均处于正常眼压区间,屏气10 s后眼压测量值有3眼高于正常值,无低于正常值者,屏气30 s后眼压测量值有22眼高于正常值,无低于正常值者。屏气10 s后与正常状态测量眼压值呈升高状态,差异有统计学意义(P<0.05),屏气30 s后与屏气10 s后及常规平静呼吸状态下测量眼压呈现升高状态,差异有统计学意义(P<0.05)。非接触眼压计测量值与屏气时间存在相关关系,屏气后测量值变化与屏气时间也存在相关关系,即屏气时间越久,眼压越高。而屏气后测量值变化与患者年龄、性别、角膜厚度、角膜曲率无相关关系。结论使用非接触眼压计测量眼压时,应嘱患者避免屏气,以免使测量值受到干扰,如果因为紧张等因素患者无法完全配合,那么也应当在屏气动作10 s之内完成测量眼压,此时的影响要显著低于更长时间屏气对眼压测量值的干扰。

Influence of breath holding on intraocular pressure measured by non-contact tonometry

Objective To explore the effect of breath holding on intraocular pressure measured by non-contact tonometry. Methods The intraocular pressure of 60 eyes of 60 patients were measured by non-contact tonometry, in the breathing state and after breath holding for 10 and 30 s. Further, the difference and correlation of the measured intraocular pressure among different breathing states were analyzed. Results In the calm breathing state, the intraocular pressure of all 60 eyes was in the normal range. After breath holding for 10 and 30 s, the intraocular pressure of three 22 eyes exceeded the normal range, respectively. The intraocular pressure was significantly higher after breath holding for 10 s than that in the calm breathing state(P<0.05)and after breath holding for 30 s than that after breath holding for 10 s or in the calm breathing state(P<0.05). There was a correlation between the intraocular pressure measured by non-contact tonometry and the breath holding time and between changes in the intraocular pressure measured after breath holding and the breath holding time. The longer the breath holding time, the higher was the intraocular pressure. There was no correlation between changes in the intraocular pressure and the patients' age, sex, corneal thickness, or corneal curvature. Conclusion When measuring intraocular pressure by non-contact tonometry, patients should be advised to avoid breath holding and interferences. For patients with poor breath-hold performance due to stress or other factors, the intraocular pressure should be measured within 10 s of breath holding. The effect of breath-holding time of 10 s was significantly lower than that of longer breath-holding times on intraocular pressure measurements.