title: Effects of different levels of intraocular stray light on kinetic perimetry findings.
abstract: OBJECTIVE
  To evaluate the effect of different levels of intraocular stray light on kinetic perimetry findings.
  
  
  METHODS
  Twenty-five eyes of 25 healthy young participants were examined by automated kinetic perimetry (Octopus 900) using Goldmann stimuli III4e, I4e, I3e, I2e, and I1e. Each stimulus was presented with a velocity of 3°/s at 24 meridians with 15° intervals. Four levels of intraocular stray light were induced using non-white opacity filter (WOF) filters and WOFs applied to the clear plastic eye covers of the participants. The visual acuity, pupil diameter, isopter area, and kinetic sensitivity of each meridian were analyzed for each WOF density.
  
  
  RESULTS
  Visual acuity deteriorated with increasing WOF densities (p < 0.01). With a visual acuity of 0.1 LogMAR units, the isopter areas for III4e, I4e, I3e, I2e, and I1e decreased by -32.7 degree2 (-0.2%), -255.7 degree2 (-2.6%), -381.2 degree2 (-6.2%), -314.8 degree2 (-12.8%), and -59.2 degree2 (-15.2%), respectively; kinetic sensitivity for those stimuli decreased by -0.1 degree (-0.1%), -0.8 degree (-1.4%), -1.6 degree (-3.7%), -2.7 degree (-9.7%), and -1.7 degree (-16.2%), respectively. The pupil diameter with each WOF density was not significantly different.
  
  
  CONCLUSIONS
  Kinetic perimetry measurements with a high-intensity stimulus (i.e., III4e) were unaffected by intraocular stray light. In contrast, measurements with the I4e, I3e, I2e, and I1e stimuli, especially I2e and I1e, were affected. Changes in the shape of the isopter resulting from opacity must be monitored, especially in cases of smaller and lower-intensity stimuli.
authors.affiliation: Orthoptics and Visual Science, Department of Rehabilitation, School of Allied Health Sciences, Kitasato University, Kanagawa, Japan.
authors.forename: Kazunori
authors.initials: K
authors.lastname: Hirasawa
authors.affiliation: Orthoptics and Visual Science, Department of Rehabilitation, School of Allied Health Sciences, Kitasato University, Kanagawa, Japan.
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Shoji
authors.affiliation: Orthoptics and Visual Science, Department of Rehabilitation, School of Allied Health Sciences, Kitasato University, Kanagawa, Japan.
authors.forename: Karen
authors.initials: K
authors.lastname: Isono
authors.affiliation: Orthoptics and Visual Science, Department of Rehabilitation, School of Allied Health Sciences, Kitasato University, Kanagawa, Japan.
authors.forename: Manami
authors.initials: M
authors.lastname: Tsuchiya
mesh_terms: D000818:Animals; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007700:Kinetics; D008297:Male; D010775:Photic Stimulation / Q000379:methods*; D014792:Visual Acuity / Q000502:physiology*; D058609:Visual Field Tests / Q000379:methods*; D055815:Young Adult