title: Continuous 24-hour ocular dimensional profile recording in medically treated normal-tension glaucoma.
abstract: OBJECTIVE
  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).
  
  
  CONCLUSIONS
  In medically treated NTG subjects, there was more variability in the IOP-related pattern during the daytime and there were fewer peaks during sleep.
authors: Department of Ophthalmology, The University of Hong Kong, Hong Kong ; Department of Ophthalmology, Caritas Medical Centre, Hong Kong.
authors: Jacky Wy
authors: JW
authors: Lee
authors: Department of Ophthalmology, The University of Hong Kong, Hong Kong.
authors: Lin
authors: L
authors: Fu
authors: Department of Ophthalmology, The University of Hong Kong, Hong Kong.
authors: Jennifer Wh
authors: JW
authors: Shum
authors: Department of Ophthalmology, Queen Mary Hospital, Hong Kong.
authors: Jonathan Ch
authors: JCh
authors: Chan
authors: Department of Ophthalmology, The University of Hong Kong, Hong Kong.
authors: Jimmy Sm
authors: JS
authors: Lai
keywords: 24-hour; intraocular pressure; normal tension glaucoma