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24 hour IOP-related volumetric fluctuations monitored with a contact lens sensor in patients with primary open-angle glaucoma, treated surgically with canaloplasty

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Session Details

Session Title: Glaucoma II

Session Date/Time: Monday 15/09/2014 | 08:00-10:30

Paper Time: 10:04

Venue: Boulevard F (Level 1)

First Author: : J.Wierzbowska POLAND

Co Author(s): :    A. Byszewska   K. Petz   K. Murawski   J. Konopińska   Z. Mariak   M. Rękas

Abstract Details


To assess the influence of glaucoma surgery – canaloplasty on circadian IOP-related volumetric changes of the eyeball in patients with primary open angle glaucoma.


Department of Ophthalmology, Military Medical Institute, Warsaw, Poland.


Ten eyes (4 right/6 left) of ten patients (6 women/4 men, mean age 67.4), with open angle glaucoma (mean MD -4,70 decibels), which were qualified to canaloplasty, were included in this prospective study. Measurements were taken twice using a contact lens sensor Triggerfish® (Sensimed) the day before and 3 months after the surgery. Goldmann applanation tonometry was performed before contact lens application and after its removal, pre and postoperatively. IOP-related volumetric changes were graphically presented as tensiometric fluctuations curves and analyzed in two ways: based on the raw data and using Falk frequency.


The mean Goldmann applanation tonometry IOP in all treated eyes was reduced of 4.8 mmHg three months after canaloplasty (p<0.05). Significant difference was seen when the SD values of the contact lens sensor curves of each patients, before and after the canaloplasty were compared. Both pre- and postoperative contact lens sensor patterns of each patient were similar as far as the circadian trend of fluctuations is concerned, with maximum telemetric values being observed during night hours


This preliminary data showed that canaloplasty is a successful surgical method of lowering IOP in glaucoma patients. Our data suggest also that canaloplasty does not affect significantly the individual 24-hour contact lens sensor fluctuation pattern. The 24-hour continuous IOP-related volumetric changes of the eyeball, obtained with contact lens sensor is affected by patient’s individual characteristics and daily activities. Further studies on a larger study population are needed to improve interpretation of the telemetric signal.

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