title: Relationship between preferred sleeping position and asymmetric visual field loss in open-angle glaucoma patients.
abstract: OBJECTIVE
  To investigate the relationship between preferred sleeping position and asymmetric visual field (VF) loss in open-angle glaucoma (OAG) patients.
  
  
  METHODS
  Retrospective, cross-sectional study.
  
  
  METHODS
  Six hundred and ninety-two (692) patients with bilateral normal-tension glaucoma (NTG) or high-tension glaucoma were consecutively enrolled. A questionnaire to determine the preferred sleeping position was administered to each patient. Asymmetric VF loss was defined as a difference in mean deviation between the 2 eyes of at least 2 dB. According to these values, the better eye and worse eye were defined. Among the patients with asymmetric VF loss, the numbers preferring the worse eye-dependent lateral decubitus position and the better eye-dependent lateral decubitus position were compared.
  
  
  RESULTS
  Among the enrolled patients, 309 (60.6%) with NTG and 121 (66.5%) with high-tension glaucoma had asymmetric VF between the 2 eyes. Among the 309 NTG patients, 100 (32.4%) preferred the lateral decubitus position. Of these, 66 (66.0%) preferred the worse eye-dependent lateral decubitus position (P = .001). Among the 121 high-tension glaucoma patients, 32 (26.4%) preferred the lateral decubitus position, and of these, 23 (71.9%) preferred the worse eye-dependent lateral decubitus position (P = .013).
  
  
  CONCLUSIONS
  Our results suggest that the sleep position habitually preferred by glaucoma patients may be associated with greater VF loss.
authors.affiliation: Department of Ophthalmology, Chungnam National University Hospital, Daejeon, South Korea.
authors.forename: Kyoung Nam
authors.initials: KN
authors.lastname: Kim
authors.affiliation: Department of Ophthalmology, Seoul National University Hospital, Seoul, South Korea.
authors.forename: Jin Wook
authors.initials: JW
authors.lastname: Jeoung
authors.affiliation: Department of Ophthalmology, Seoul National University Hospital, Seoul, South Korea; Department of Ophthalmology, Seoul National University College of Medicine, Seoul, South Korea. Electronic address: kihopark@snu.ac.kr.
authors.forename: Ki Ho
authors.initials: KH
authors.lastname: Park
authors.affiliation: Department of Ophthalmology, Seoul National University Hospital, Seoul, South Korea; Department of Ophthalmology, Seoul National University College of Medicine, Seoul, South Korea.
authors.forename: Dong Myung
authors.initials: DM
authors.lastname: Kim
authors.affiliation: Einhorn Clinical Research Center, New York Eye and Ear Infirmary, New York, New York; Department of Ophthalmology, New York Medical College, Valhalla, New York.
authors.forename: Robert
authors.initials: R
authors.lastname: Ritch
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D005260:Female; D005902:Glaucoma, Open-Angle / Q000503:physiopathology*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D008297:Male; D008875:Middle Aged; D011187:Posture / Q000502:physiology*; D012189:Retrospective Studies; D012890:Sleep / Q000502:physiology*; D011795:Surveys and Questionnaires; D014065:Tonometry, Ocular; D014794:Visual Fields / Q000502:physiology*; D055815:Young Adult