Continuous 24-hour ocular dimensional profile recording in medically treated normal-tension glaucoma
Authors Lee J, Fu L, Shum J, Chan JC, Lai JSM
Received 3 October 2014
Accepted for publication 28 November 2014
Published 29 January 2015 Volume 2015:9 Pages 197—202
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 6
Editor who approved publication: Dr Scott Fraser
Jacky WY Lee,1,2 Lin Fu,1 Jennifer WH Shum,1 Jonathan CH Chan,3 Jimmy SM Lai1
1Department of Ophthalmology, The University of Hong Kong, Hong Kong; 2Department of Ophthalmology, Caritas Medical Centre, Hong Kong; 3Department of Ophthalmology, Queen Mary Hospital, Hong Kong
Purpose: To analyze the 24-hour ocular dimensional profile in normal-tension glaucoma (NTG) patients on medical treatment.
Methods: Consecutive, medically treated NTG subjects were recruited from a university eye center. Subjects were on a mean of 1.7±0.7 types of antiglaucoma medications and 56.6% were on a prostaglandin analog. A contact lens-based sensor device was worn in one eye of NTG patients to record the intraocular pressure (IOP)-related profile for 24 hours, recording the following: variability from mean over 24 hours, nocturnally and diurnally, as well as the number of peaks and troughs diurnally and nocturnally.
Results: In 18 NTG subjects, the nocturnal variability around the mean contact lens-based sensor device signal was 48.9% less than the diurnal variability around the mean. The number of peaks was 54.7% less during the nocturnal period than during the diurnal period. The rate of increase in the ocular dimensional profile when going to sleep was significantly greater than the rate of decrease upon waking (P<0.001).
Conclusion: In medically treated NTG subjects, there was more variability in the IOP-related pattern during the daytime and there were fewer peaks during sleep.
Keywords: intraocular pressure, 24-hour, normal tension glaucoma
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