title: Effect of a blue-light-blocking intraocular lens on the quality of sleep.
abstract: OBJECTIVE
  To evaluate whether implantation of a blue-light-blocking intraocular lens (IOL) affects sleep quality.
  
  
  METHODS
  Repatriation General Hospital, Adelaide, Australia.
  
  
  METHODS
  This study comprised patients who had bilateral cataract surgery during the preceding 12 months with implantation of a conventional SI40NB IOL or an AcrySof Natural SN60WF blue-light-blocking IOL. Patients were contacted by telephone at least 6 months after second-eye surgery, and the Pittsburgh Sleep Quality Index (PSQI) questionnaire was administered. Results were compared between groups.
  
  
  RESULTS
  Of the 49 patients, 31 received conventional IOLs and 18, blue-light-blocking IOLs. The mean age of the patients was 80 years +/- 8.1 (SD). The median PSQI score was 6 (interquartile range 3 to 8). There were no statistically significant differences in PSQI scores between the 2 IOL groups (P = .65). This remained true after adjustment for sex, age, medication, and time since surgery.
  
  
  CONCLUSIONS
  The blue-light-blocking IOL had no effect on the sleep quality of patients, indicating that these IOLs might serve as an alternative to conventional IOLs without a detrimental effect on circadian rhythm.
authors.affiliation: Department of Ophthalmology, Repatriation General Hospital, Adelaide, Australia. john.landers@bigpond.com
authors.forename: John A
authors.initials: JA
authors.lastname: Landers
authors.forename: David
authors.initials: D
authors.lastname: Tamblyn
authors.forename: Don
authors.initials: D
authors.lastname: Perriam
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002940:Circadian Rhythm / Q000502:physiology; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008027:Light; D008297:Male; D018918:Phacoemulsification; D011474:Prosthesis Design; D012890:Sleep / Q000502:physiology*; D011795:Surveys and Questionnaires