Studying How Labor Affects Eye Pressure in Healthy Pregnant Women Wearing Contact Lenses

What this Trial Is About

This research focuses on how labor affects fluctuations in intraocular pressure, a key risk factor for glaucoma, during vaginal birth. The study involves patients with healthy eyes who either have perfect vision or a minor refractive error and regularly wear contact lenses. Researchers aim to understand the risks to glaucoma patients related to increased eye pressure during active pushing, a phase of labor not previously measured for this condition. Participants will be included between the 35th and 37th week of pregnancy, undergoing detailed eye examinations including pressure measurement before labor begins. During labor, patients will have special SENSIMED Triggerfish contact lenses placed on their eyes, which measure intraocular pressure every 5 minutes for 30 seconds, roughly matching the duration of 1 to 2 uterine contractions. Pressure will also be measured between contractions using a Tonopen device, and continuous fetal heart monitoring will occur during the second stage of labor. Throughout the study, ophthalmologists and gynecologists will collect and compare data from the contact lenses and cardiotocograph to assess how intraocular pressure changes with contractions. The lenses remain in place until two hours after birth when they are removed. Standard pregnancy check-ups continue as usual, and the study tracks both intraocular pressure fluctuations and uterine contraction rates over a 24-hour period starting with regular contractions. This allows researchers to evaluate the individual pressure changes related to labor contractions and their possible impact on glaucoma risk.

The Effect of Labor on Intraocular Pressure Fluctuation in Healthy Eyes