title: Changes in intraocular pressure after cataract surgery: analysis of the Swedish National Cataract Register Data.
abstract: OBJECTIVE
  To analyze changes in intraocular pressure (IOP) after cataract surgery based on data from the Swedish National Cataract Register (NCR).
  
  
  METHODS
  Ophthalmic surgery units in Sweden.
  
  
  METHODS
  Prospective database study.
  
  
  METHODS
  Data for 2012 through 2014 were obtained prospectively from the NCR. The outcome register of the NCR has collected data on IOP before and a mean of 37.7 days ± 29.1 (SD) after cataract surgery since 2012.
  
  
  RESULTS
  The analyses were based on 20 437 cataract extractions reported during 1 month each year to the outcome registry of the NCR. Cataract surgery was found to reduce IOP by a mean of 1.46 mm Hg, which was statistically significant (P < .001). A larger IOP reduction was seen in cases with a higher preoperative IOP (r = 0.557, P < .001). Older patients and shorter eyes had a greater IOP reduction after surgery (P < .001 and P = .001, respectively). Women had a greater IOP reduction than men (P = .04) When high IOP was given as an indication for surgery, the IOP reduction after cataract surgery was 5.50 mm Hg compared with a reduction of 1.40 mm Hg in patients for whom this indication was not given (P < .001). Patients with glaucoma or pseudoexfoliation (PXF) had a more pronounced IOP reduction than patients without these diagnoses (P < .001).
  
  
  CONCLUSIONS
  Cataract surgery had an IOP-lowering effect, in particular in older patients, women, short eyes, eyes with high preoperative IOP, and eyes with glaucoma or PXF.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: From the Department of Clinical Neuroscience (Zetterström, Kugelberg, Montan), Division of Ophthalmology and Vision, Karolinska Institutet, and EyeNet Sweden (Zetterström, Lundström), Blekinge Hospital, Karolinska; St. Erik Eye Hospital (Kugelberg, Montan), Stockholm; the Department of Clinical Sciences/Ophthalmology (Behndig), Umeå University Hospital, Umeå; and the Department of Clinical Sciences (Lundström) Ophthalmology, Faculty of Medicine, Lund University, Lund, Sweden. Electronic address: charlotta.zetterstrom@gmail.com.
authors.forename: Charlotta
authors.initials: C
authors.lastname: Zetterström
authors.affiliation: From the Department of Clinical Neuroscience (Zetterström, Kugelberg, Montan), Division of Ophthalmology and Vision, Karolinska Institutet, and EyeNet Sweden (Zetterström, Lundström), Blekinge Hospital, Karolinska; St. Erik Eye Hospital (Kugelberg, Montan), Stockholm; the Department of Clinical Sciences/Ophthalmology (Behndig), Umeå University Hospital, Umeå; and the Department of Clinical Sciences (Lundström) Ophthalmology, Faculty of Medicine, Lund University, Lund, Sweden.
authors.forename: Anders
authors.initials: A
authors.lastname: Behndig
authors.affiliation: From the Department of Clinical Neuroscience (Zetterström, Kugelberg, Montan), Division of Ophthalmology and Vision, Karolinska Institutet, and EyeNet Sweden (Zetterström, Lundström), Blekinge Hospital, Karolinska; St. Erik Eye Hospital (Kugelberg, Montan), Stockholm; the Department of Clinical Sciences/Ophthalmology (Behndig), Umeå University Hospital, Umeå; and the Department of Clinical Sciences (Lundström) Ophthalmology, Faculty of Medicine, Lund University, Lund, Sweden.
authors.forename: Maria
authors.initials: M
authors.lastname: Kugelberg
authors.affiliation: From the Department of Clinical Neuroscience (Zetterström, Kugelberg, Montan), Division of Ophthalmology and Vision, Karolinska Institutet, and EyeNet Sweden (Zetterström, Lundström), Blekinge Hospital, Karolinska; St. Erik Eye Hospital (Kugelberg, Montan), Stockholm; the Department of Clinical Sciences/Ophthalmology (Behndig), Umeå University Hospital, Umeå; and the Department of Clinical Sciences (Lundström) Ophthalmology, Faculty of Medicine, Lund University, Lund, Sweden.
authors.forename: Per
authors.initials: P
authors.lastname: Montan
authors.affiliation: From the Department of Clinical Neuroscience (Zetterström, Kugelberg, Montan), Division of Ophthalmology and Vision, Karolinska Institutet, and EyeNet Sweden (Zetterström, Lundström), Blekinge Hospital, Karolinska; St. Erik Eye Hospital (Kugelberg, Montan), Stockholm; the Department of Clinical Sciences/Ophthalmology (Behndig), Umeå University Hospital, Umeå; and the Department of Clinical Sciences (Lundström) Ophthalmology, Faculty of Medicine, Lund University, Lund, Sweden.
authors.forename: Mats
authors.initials: M
authors.lastname: Lundström
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016208:Databases, Factual; D005260:Female; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D019654:Lens Implantation, Intraocular; D008297:Male; D018918:Phacoemulsification; D011184:Postoperative Period; D011446:Prospective Studies; D012042:Registries / Q000706:statistics & numerical data*; D013548:Sweden; D014065:Tonometry, Ocular