Comparison between intraocular pressure spikes with water loading and postural change

Area of Science:

• Ophthalmology
• Glaucoma Research
• Intraocular Pressure Measurement

Background:

• Investigating intraocular pressure (IOP) monitoring in primary open angle glaucoma (POAG) is crucial for disease management.
• Comparing diagnostic methods for IOP is essential for accurate glaucoma assessment.

Purpose of the Study:

• To compare the agreement between peak intraocular pressures measured using the water drinking test (WDT) and the supine test (ST).
• To evaluate the potential of the supine test as a safer alternative for IOP measurement in POAG patients.

Main Methods:

• A prospective, blinded study involving 21 POAG patients.
• Intraocular pressure was measured using both WDT and ST, with readings taken at 0, 20, and 40 minutes.
• Bland-Altman analysis was employed to assess the agreement between the two measurement methods.

Main Results:

• Bland-Altman analysis revealed excellent agreement between the supine test and water drinking test for IOP measurements.
• Mean differences between the methods were minimal (1.0, -1.0, and -0.90 mmHg at 0, 20, and 40 minutes, respectively).
• Confidence intervals were within 6.5 mmHg for most time points, indicating high concordance.

Conclusions:

• The supine test and water drinking test demonstrate close agreement in measuring intraocular pressure.
• The supine test presents a potentially safer and more comfortable alternative to the water drinking test for IOP assessment in glaucoma patients.