Wang Xiaohong, Shen Joanne, McCulley James P, Bowman R Wayne, Petroll W Matthew, Cavanagh H Dwight
Department of Ophthalmology, The University of Texas Southwestern Medical Center at Dallas, 75390-9057, USA.
CLAO J. 2002 Jul;28(3):136-9.
Previous studies have shown that Goldmann applanation tonometry (GAT) underestimates intraocular pressure (IOP) following photorefractive keratometry (PRK) and myopic laser in situ keratomileusis (LASIK). The purpose of this study was to evaluate the reliability of intraocular pressure (IOP) measurements by Goldmann applanation tonometry and pneumotonometry (PT) after hyperopic LASIK.
The IOPs of 20 eyes of 15 patients who underwent hyperopia LASIK were prospectively evaluated. Central and peripheral IOP were measured with GAT and PT, and central and peripheral corneal thicknesses were measured with ultrasonographic pachymetry. Patients were evaluated preoperatively and at 12 months postoperatively.
Postoperative GAT measurements of IOP made from the central (13.1+/-2.7 mm Hg) and peripheral (13.9+/-3.3 mm Hg) corneal areas were significantly lower (P <0.001) than central IOP measured preoperatively (17.0+/-2.5 mm Hg). Postoperative PT measurements from the central (17.4+/-3.2 mm Hg) and peripheral (17.6+/-2.9 mm Hg) corneal areas were slightly lower than preoperative central IOP (18.4+/-2.4 mm Hg), but not statistically significant. There were no significant differences between central and peripheral IOP measurements using either method.
The data demonstrate that GAT may underestimate IOP measurement, following hyperopic LASIK.
以往研究表明，Goldmann压平眼压计（GAT）会低估准分子激光角膜切削术（PRK）和近视性准分子原位角膜磨镶术（LASIK）后的眼压（IOP）。本研究的目的是评估远视性LASIK术后Goldmann压平眼压计和气压眼压计（PT）测量眼压的可靠性。
前瞻性评估15例接受远视性LASIK手术患者的20只眼的眼压。使用GAT和PT测量中央和周边眼压，使用超声角膜测厚仪测量中央和周边角膜厚度。在术前和术后12个月对患者进行评估。
术后通过GAT测量中央角膜区域（13.1±2.7mmHg）和周边角膜区域（13.9±3.3mmHg）的眼压明显低于术前测量的中央眼压（17.0±2.5mmHg）（P<0.001）。术后通过PT测量中央角膜区域（17.4±3.2mmHg）和周边角膜区域（17.6±2.9mmHg）的眼压略低于术前中央眼压（18.4±2.4mmHg），但无统计学意义。两种方法测量的中央和周边眼压之间无显著差异。
数据表明，远视性LASIK术后GAT可能会低估眼压测量值。
