title: The effect of cataract on sleep time and quality in late adulthood.
abstract: OBJECTIVE
  This study was undertaken to evaluate the effect of senile cataract on sleep profiles.
  
  
  METHODS
  Clinical interviews and comprehensive ophthalmological examinations were done on 378 patients over 59 years old. Severities of cataract as a whole (LO: lenticular opacity) and nucleosclerosis (LN: lenticular nucleosclerosis) were determined by the LOCS (Lens Opacities Classification System) III. PSQI (Pittsburgh Sleep Quality Index) was performed to determine sleep profiles. HAS (Hospital Anxiety-Depression Scale) was performed to evaluate emotional status. The relationship between total sleep time per night (TST), wake-up time and bed time with LO and LN were evaluated.
  
  
  RESULTS
  LO and LN were both associated with earlier bed- and wake-up times, but only bed time and LN had significant association (p=0.0006). PSQI sleep quality subscale and global scores were significantly higher with advanced LN (p=0.017, p=0.018).
  
  
  CONCLUSIONS
  Advanced nucleosclerosis is associated with earlier bed time and lower quality of sleep. Stimulus by appropriate light to the eye is necessary for the physiologic regulation of sleep.
authors: Department of Ophthalmology, The Catholic University of Korea, Seoul, South Korea.
authors: Yeong Hoon
authors: YH
authors: Kim
authors: Kyu In
authors: KI
authors: Jung
authors: Chan Hee
authors: CH
authors: Song
mesh_terms: D000368:Aged; D002386:Cataract / Q000150:complications / Q000503:physiopathology*; D057906:Circadian Clocks / Q000502:physiology / Q000528:radiation effects; D005260:Female; D006801:Humans; D008027:Light; D008297:Male; D008875:Middle Aged; D012890:Sleep / Q000502:physiology* / Q000528:radiation effects; D020178:Sleep Disorders, Circadian Rhythm / Q000209:etiology / Q000503:physiopathology; D013997:Time Factors