Efficacy of a contact lens sensor for monitoring 24-h intraocular pressure related patterns

• Published in: PloS one 2015-05, Vol.10 (5), p.e0125530-e0125530
• Main Authors: Mansouri, Kaweh, Weinreb, Robert N, Liu, John H K
• Format: Article
• Language: English
• Subjects: Adult; Case-Control Studies; Contact Lenses; Contact pressure; Diabetic retinopathy; Eye; Eye (anatomy); Eye lens; Female; Glaucoma; Glaucoma - diagnosis; Heart Rate; Humans; Hypertension; Intraocular Pressure; Male; Measurement; Middle Aged; Monitoring; Physiological aspects; Reproducibility of Results; Sensors; Sitting position; Sleep; Sleep and wakefulness; Slopes; Strain gauges; Technology application; Time Factors; Tonometry, Ocular - methods; Young Adult
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0125530

To study performance of a contact lens sensor (CLS) for 24-hour monitoring of IOP-related short-term patterns and compare with IOP obtained by pneumatonometry. Prospective clinical trial. Thirty-one healthy volunteers and 2 glaucoma patients were housed for 24 hours in a sleep laboratory. One randomly selected eye was fitted with a CLS (Triggerfish, Sensimed, Switzerland), which measures changes in ocular circumference. In the contralateral eye, IOP measurements were taken using a pneumatonometer every two hours with subjects in the habitual body positions. Heart rate (HR) was measured 3 times during the night for periods of 6 minutes separated by 2 hours. Performance of CLS was defined in two ways: 1) recording the known pattern of IOP increase going from awake (sitting position) to sleep (recumbent), defined as the wake/sleep (W/S) slope and 2) accuracy of the ocular pulse frequency (OPF) concurrent to that of the HR interval. Strength of association between overall CLS and pneumatonometer curves was assessed using coefficients of determination (R2). The W/S slope was statistically significantly positive in both eyes of each subject (CLS, 57.0 ± 40.5 mVeq/h, p