Department of Ophthalmology, School of Medicine, Poostchi Ophthalmology Research Center, Shiraz University of Medical Sciences.
Salouti Cornea Research Center, Salouti Eye Clinic, Shiraz, Iran.
J Glaucoma. 2024 Oct 1;33(10):780-784. doi: 10.1097/IJG.0000000000002434. Epub 2024 May 21.
The study showed that Corvis ST's biomechanical intraocular pressure (bIOP) and ocular response analyzer's (ORA) cornea-compensated intraocular pressure (IOPcc) do not agree well, before or after photorefractive keratectomy (PRK), and may not be used interchangeably. bIOP remained unchanged after PRK.
To evaluate the agreement between the biomechanically corrected intraocular pressure (bIOP) measured by the Corvis ST and the IOPcc measured by the ORA before and after PRK.
In this prospective interventional study, a total of 53 patients (53 eyes) were included. Measurements were acquired using both the Corvis ST and ORA devices before and 3 months post-PRK. The agreement between the 2 devices was evaluated using limits of agreement (LoA) and Bland-Altman plots.
The participants had a mean age of 29.6 ± 5.21 years (range: 21 to 40), with 41 (77.4%) of them being females. After the surgery, the average change in intraocular pressure (IOP) was 0.3 ± 1.7 mm Hg for bIOP and -1.6 ± 4.0 mm Hg for IOPcc. The corresponding 95% LoA were -3.5 to 4.2 mm Hg and -9.5 to 6.3 mm Hg, respectively. The 95% LoA between bIOP and IOPcc after PRK was -2.3 to 8.5 mm Hg. Notably, the bIOP values were higher for IOPs <20 mm Hg and lower for IOPs >20 mm Hg compared with IOPcc.
The findings indicate a weak agreement between the Corvis ST-bIOP and the ORA-IOPcc both before and after PRK. These devices may not be used interchangeably for IOP measurement. bIOP exhibited less variation compared with the IOPcc, suggesting that the bIOP may be a better option for IOP reading after PRK.
研究表明，Corvis ST 的生物力学眼压（bIOP）和眼反应分析仪（ORA）角膜补偿眼压（IOPcc）在 PRK 前后一致性不佳，两者可能不能互换使用。PRK 后 bIOP 保持不变。
评估 PRK 前后 Corvis ST 测量的生物力学校正眼压（bIOP）与 ORA 测量的 IOPcc 之间的一致性。
本前瞻性干预研究纳入了 53 名患者（53 只眼）。使用 Corvis ST 和 ORA 设备在 PRK 前后进行测量。使用限差值（LoA）和 Bland-Altman 图评估两种设备之间的一致性。
参与者的平均年龄为 29.6±5.21 岁（范围：21 至 40 岁），其中 41 名（77.4%）为女性。手术后，bIOP 的眼压平均变化为 0.3±1.7mmHg，IOPcc 的眼压平均变化为-1.6±4.0mmHg。相应的 95%LoA 分别为-3.5 至 4.2mmHg 和-9.5 至 6.3mmHg。PRK 后 bIOP 和 IOPcc 的 95%LoA 为-2.3 至 8.5mmHg。值得注意的是，bIOP 值在眼压<20mmHg 时较高，在眼压>20mmHg 时较低。
研究结果表明，Corvis ST-bIOP 和 ORA-IOPcc 在 PRK 前后一致性较弱。这些设备可能不能互换用于眼压测量。bIOP 与 IOPcc 相比变化较小，提示 bIOP 可能是 PRK 后眼压读数的更好选择。
