Ing Edsel, Zhang Angela, Michaelov Evan, Wang Wendy
Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Canada.
Schulich School of Medicine, Western University, Ontario, Canada.
Open Ophthalmol J. 2018 Jun 22;12:104-109. doi: 10.2174/1874364101812010104. eCollection 2018.
Dynamic Contour Tonometry (DCT) is touted to be the most accurate tonometer for Intraocular Pressure (IOP) measurement. Non-Contact "air puff" Tonometry (NCT) may be the most commonly used tonometer for screening of IOP. Elevated IOP is important to exclude in patients presenting with headache or vision loss.
To determine the agreement between DCT and NCT.
The IOP of adult patients 50 years of age or older presenting with headache or vision loss for possible temporal artery biopsy were prospectively recorded. NCT and DCT measurements were obtained within thirty minutes. The right eye IOP measurements were compared with paired t-test, and Bland- Altman plot analysis. The left eye IOP measurements were subsequently analyzed for confirmation of results.
There were 106 subjects with complete right eye data, and 104 subjects with complete left eye data. The average age was 72 years, and 70% were female. The NCT IOP was on average 3.9 mm Hg lower in the right eye, and 3.5 mm Hg lower in the left eye compared with DCT. (p<.001) In the right eye the Bland-Altman analysis showed the 95% agreement interval between the two tonometers was -2.5 to 10.4 mmHg and in the left eye -3.0 to 9.9 mmHg.
The IOP from NCT and DCT should not be used interchangeably because their level of disagreement includes clinically important discrepancies of up to 10 mm Hg.
动态轮廓眼压计（DCT）被誉为测量眼压（IOP）最准确的眼压计。非接触式“吹气”眼压计（NCT）可能是筛查眼压最常用的眼压计。对于出现头痛或视力丧失的患者，排除眼压升高很重要。
确定DCT和NCT之间的一致性。
前瞻性记录50岁及以上因可能的颞动脉活检而出现头痛或视力丧失的成年患者的眼压。在30分钟内获得NCT和DCT测量值。右眼眼压测量值采用配对t检验和Bland-Altman图分析进行比较。随后对左眼眼压测量值进行分析以确认结果。
有106名受试者有完整的右眼数据，104名受试者有完整的左眼数据。平均年龄为72岁，70%为女性。与DCT相比，右眼NCT眼压平均低3.9 mmHg，左眼低3.5 mmHg。（p<0.001）在右眼，Bland-Altman分析显示两种眼压计之间的95%一致性区间为-2.5至10.4 mmHg，在左眼为-3.0至9.9 mmHg。
NCT和DCT测得的眼压不应互换使用，因为它们的差异水平包括高达10 mmHg的具有临床重要意义的差异。
