title: Effect of cataract surgery with intraocular lens implant on frequency doubling perimetry.
abstract: OBJECTIVE
  To study the effect of cataract surgery with intraocular lens (IOL) on frequency doubling perimetry (FDP).
  
  
  METHODS
  Patients aged 40 years or above seen at our outpatient clinic with no ocular pathology except for visually significant cataract and visual acuity 6/24 or better were eligible. They underwent FDP before and 4 to 6 weeks after cataract surgery with IOL.
  
  
  RESULTS
  Screening test: Mean scores by three different scoring methods were 1.82 (3.21), 2.80 (5.54), 4.18 (9.18) before and 0.22 (0.51), 0.26 (0.63), 0.26 (0.69) after surgery (p = 0.002 0.001, < 0.0001). Threshold test: Mean deviation (MD) and pattern standard deviation (PSD) were -5.23 (3.08) and 5.15 (2.78) before and -2.94 [corrected] (2.49) (p < 0.0001) and 5.21 (1.780) (p = 0.63) after surgery.
  
  
  CONCLUSIONS
  The screening test should be interpreted cautiously in the presence of cataract. On threshold testing, cataract surgery causes significant decrease in MD but no change in PSD.
authors.affiliation: Vision Research Foundation, Sankara Nethralaya, Chennai, India.
authors.forename: Hemamalini
authors.initials: H
authors.lastname: Arvind
authors.forename: Ronnie
authors.initials: R
authors.lastname: George
authors.forename: M
authors.initials: M
authors.lastname: Baskaran
authors.forename: Prema
authors.initials: P
authors.lastname: Raju
authors.forename: S Ve
authors.initials: SV
authors.lastname: Ramesh
authors.forename: Pradeep G
authors.initials: PG
authors.lastname: Paul
authors.forename: Lingam
authors.initials: L
authors.lastname: Vijaya
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002386:Cataract / Q000503:physiopathology; D002387:Cataract Extraction; D015331:Cohort Studies; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D014786:Vision Disorders / Q000503:physiopathology; D014792:Visual Acuity / Q000502:physiology; D058609:Visual Field Tests; D014794:Visual Fields / Q000502:physiology*