title: Comparative resilience of clinical perimetric tests to induced levels of intraocular straylight.
abstract: OBJECTIVE
  To investigate the effect of intraocular straylight (IOS) induced by white opacity filters (WOF) on threshold measurements for stimuli employed in three perimeters: standard automated perimetry (SAP), pulsar perimetry (PP) and the Moorfields motion displacement test (MDT).
  
  
  METHODS
  Four healthy young (24-28 years old) observers were tested six times with each perimeter, each time with one of five different WOFs and once without, inducing various levels of IOS (from 10% to 200%). An increase in IOS was measured with a straylight meter. The change in sensitivity from baseline was normalized, allowing comparison of standardized (z) scores (change divided by the SD of normative values) for each instrument.
  
  
  RESULTS
  SAP and PP thresholds were significantly affected (P < 0.001) by moderate to large increases in IOS (50%-200%). The drop in motion displacement (MD) from baseline with WOF 5, was approximately 5 dB, in both SAP and PP which represents a clinically significant loss; in contrast the change in MD with MDT was on average 1 minute of arc, which is not likely to indicate a clinically significant loss.
  
  
  CONCLUSIONS
  The Moorfields MDT is more robust to the effects of additional straylight in comparison with SAP or PP.
authors.affiliation: Jules-Gonin Eye Hospital, Lausanne, Switzerland.
authors.forename: Justyna D
authors.initials: JD
authors.lastname: Oleszczuk
authors.forename: Ciara
authors.initials: C
authors.lastname: Bergin
authors.forename: Eamon
authors.initials: E
authors.lastname: Sharkawi
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008027:Light; D010775:Photic Stimulation; D012016:Reference Values; D012684:Sensory Thresholds / Q000502:physiology*; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult