title: Comparative Analysis of Visual Field Plotting by Octopus Interzeag 1-2-3, Humphrey Field Analyser II and Frequency Doubling Perimetry in Glaucoma Patients in South Indian Population.
abstract: OBJECTIVE
  Standard achromatic perimetry tests the differential light sensitivity whereas the frequency doubling technology tests the contrast sensitivity. The aim of this study was to compare and correlate the visual field indices with three different types of perimeters namely frequency doubling perimetry (FDP), Humphrey field analyser (HFA) and Octopus Interzeag 1-2-3 (OI) for detecting glaucomatous field defects.
  
  
  METHODS
  Prospective cross-sectional observational study.
  
  
  METHODS
  Hundred eyes of 50 glaucoma patients were studied. All the patients underwent visual field examinations by Octopus Interzeag 1-2-3, Humphrey field Analyser II and Frequency Doubling perimetry (FDP). The correlations of the global indices were compared. The time taken to perform the test with the three perimeters was analysed.
  
  
  RESULTS
  The visual field plotting by the perimeters were comparable and significant positive correlation was observed. The time taken to perform visual field test by Octopus Interzeag 1-2-3 was shorter than the other two methods.
  
  
  CONCLUSIONS
  The visual field plotting by Octopus Interzeag 1-2-3, Humphrey field analyser and frequency doubling technology perimetry were comparable and Octopus field plotting takes lesser time than the rest two methods.
authors.affiliation: Associate Professor, Department of Ophthalmology, Mahatma Gandhi medical college & research institute , Pondicherry, India .
authors.forename: A R
authors.initials: AR
authors.lastname: Rajalakshmi
authors.affiliation: Associate Professor, Department of ophthalmology, ESIC medical college and PGIMSR , K.K.Nagar, Chennai, India .
authors.forename: Elangovan
authors.initials: E
authors.lastname: Suma
authors.affiliation: Consultant, Nellai Eye Care Institute, 106 B2& B3 South Mount Road, Tirunelveli, India.
authors.forename: D Ranjit
authors.initials: DR
authors.lastname: Prabhu
keywords: Field defects; Frequency doubling technology; Standard achromatic perimetry; Time duration; Visual field indices