Water-drinking test in primary angle-closure suspect before and after laser peripheral iridotomy

Area of Science:

• Ophthalmology
• Glaucoma Research
• Intraocular Pressure Management

Background:

• Primary angle-closure suspects are at risk of developing angle-closure glaucoma.
• Laser peripheral iridotomy is a common treatment to prevent angle closure.
• The water-drinking test is used to assess intraocular pressure response.

Purpose of the Study:

• To investigate the effect of laser peripheral iridotomy on intraocular pressure response in primary angle-closure suspects during the water-drinking test.

Main Methods:

• Prospective study involving primary angle-closure suspects scheduled for laser peripheral iridotomy.
• Intraocular pressure was measured every 15 minutes for 1 hour during the water-drinking test, before and 2 weeks after the procedure.

Main Results:

• The average intraocular pressure range during the water-drinking test increased significantly after laser peripheral iridotomy (2.6 to 3.5 mmHg, P=0.04).
• The mean difference between peak and last intraocular pressure measurements also showed a trend of increase post-procedure (P=0.057).
• No significant change was observed in the mean peak intraocular pressure (P=0.87).

Conclusions:

• Laser peripheral iridotomy may lead to a slightly more pronounced intraocular pressure recovery in primary angle-closure suspects during the water-drinking test.
• This effect could be due to increased trabecular meshwork exposure post-treatment.
• The water-drinking test demonstrated limited value as a provocative test in this specific patient population due to minimal differences observed.