The Comparison of Intraocular Pressure Measurement by Goldmann Applanation Tonometer and the iCare Rebound Tonometer in Glaucoma Patients in Suphan Buri
Keywords:
intraocular pressure, iCare Rebound Tonometer, Goldmann Applanation TonometerAbstract
Objective : The purpose was to compare the intraocular pressure (IOP) values acquired from Goldmann Applanation Tonometer (GAT) and iCare Rebound Tonometer (RBT) in glaucoma patients.
Methods : This prospective study involved 398 eyes from 199 glaucoma patients who received services in Chaophrayayommarat Hospital. All patients had their corneal thickness measured with a corneal curvature and thickness analyzer (Pentacam) before having their intraocular pressure (IOP) measured with iCare Rebound Tonometer and followed by measurements with the Goldmann Applanation Tonometer. paired samples ttest was used to compare of intraocular pressure measured by Goldmann and icare. Correlation of intraocular pressure measured by GAT and RBT was assessed by intraclass correlation.
Results : Comparison of intraocular pressure measurements by Goldmann and iCare; in the group with intraocular pressure less than 21 mmHg, there was no statistically significant difference (p-value = .176), but the group with intraocular pressure more than 21 mmHg had statistically significant difference in intraocular pressure measured by Goldmann and iCare (p < .001). The mean intraocular pressure as measured by Goldmann was 24.64 ± 4.41 to be higher than that measured by iCare was 23.83 ± 5.27. Classified by corneal thickness (CCT); group with intraocular pressure less than 21 mmHg, both groups with corneas less than 540 μm and more than 540 μm were not significantly different; but group with intraocular pressure more than 21 mmHg , both groups with corneas less than 540 μm and more than 540 μm had statistically significant difference (p = .011, p < .001 ). Measurements by GAT and RBT had very high level of positive correlation.
Conclusions : Measurements of intraocular pressure by the Goldmann Applanation Tonometer and the iCare in glaucoma patients with normal intraocular pressure, had no statistically significant difference. But in the group with intraocular pressure more than 21 mmHg, there was a statistically significant difference. The use of iCare in patients with high intraocular pressure should be cautious in interpretation and use in examination and treatment of patients.
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ลิขสิทธิ์บทความเป็นของผู้เขียนบทความ แต่หากผลงานของท่านได้รับการพิจารณาตีพิมพ์ลงวารสารแพทย์เขต 4-5 จะคงไว้ซึ่งสิทธิ์ในการตีพิมพ์ครั้งแรกด้วยเหตุที่บทความจะปรากฎในวารสารที่เข้าถึงได้ จึงอนุญาตให้นำบทความในวารสารไปใช้ประโยชน์ได้ในเชิงวิชาการโดยจำเป็นต้องมีการอ้างอิงถึงชื่อวารสารอย่างถูกต้อง แต่ไม่อนุญาตให้นำไปใช้ในเชิงพาณิชย์
