title: Peripapillary retinal nerve fiber layer assessment of spectral domain optical coherence tomography and scanning laser polarimetry to diagnose preperimetric glaucoma.
abstract: OBJECTIVE
  To compare the abilities of peripapillary retinal nerve fiber layer (RNFL) parameters of spectral domain optical coherence tomograph (SDOCT) and scanning laser polarimeter (GDx enhanced corneal compensation; ECC) in detecting preperimetric glaucoma.
  
  
  METHODS
  In a cross-sectional study, 35 preperimetric glaucoma eyes (32 subjects) and 94 control eyes (74 subjects) underwent digital optic disc photography and RNFL imaging with SDOCT and GDx ECC. Ability of RNFL parameters of SDOCT and GDx ECC to discriminate preperimetric glaucoma eyes from control eyes was compared using area under receiver operating characteristic curves (AUC), sensitivities at fixed specificities and likelihood ratios (LR).
  
  
  RESULTS
  AUC of the global average RNFL thickness of SDOCT (0.786) was significantly greater (p<0.001) than that of GDx ECC (0.627). Sensitivities at 95% specificity of the corresponding parameters were 20% and 8.6% respectively. AUCs of the inferior, superior and temporal quadrant RNFL thickness parameters of SDOCT were also significantly (p<0.05) greater than the respective RNFL parameters of GDx ECC. LRs of outside normal limits category of SDOCT parameters ranged between 3.3 and 4.0 while the same of GDx ECC parameters ranged between 1.2 and 2.1. LRs of within normal limits category of SDOCT parameters ranged between 0.4 and 0.7 while the same of GDx ECC parameters ranged between 0.7 and 1.0.
  
  
  CONCLUSIONS
  Abilities of the RNFL parameters of SDOCT and GDx ECC to diagnose preperimetric glaucoma were only moderate. Diagnostic abilities of the RNFL parameters of SDOCT were significantly better than that of GDx ECC in preperimetric glaucoma.
authors.affiliation: VST Glaucoma Center, L V Prasad Eye Institute, Banjara Hills, Hyderabad, India.
authors.forename: Harsha L
authors.initials: HL
authors.lastname: Rao
authors.affiliation: VST Glaucoma Center, L V Prasad Eye Institute, Banjara Hills, Hyderabad, India.
authors.forename: Ravi K
authors.initials: RK
authors.lastname: Yadav
authors.affiliation: VST Glaucoma Center, L V Prasad Eye Institute, Banjara Hills, Hyderabad, India.
authors.forename: Uday K
authors.initials: UK
authors.lastname: Addepalli
authors.affiliation: VST Glaucoma Center, L V Prasad Eye Institute, Banjara Hills, Hyderabad, India.
authors.forename: Shashikant
authors.initials: S
authors.lastname: Chaudhary
authors.affiliation: VST Glaucoma Center, L V Prasad Eye Institute, Banjara Hills, Hyderabad, India.
authors.forename: Sirisha
authors.initials: S
authors.lastname: Senthil
authors.affiliation: VST Glaucoma Center, L V Prasad Eye Institute, Banjara Hills, Hyderabad, India.
authors.forename: Nikhil S
authors.initials: NS
authors.lastname: Choudhari
authors.affiliation: VST Glaucoma Center, L V Prasad Eye Institute, Banjara Hills, Hyderabad, India.
authors.forename: Chandra S
authors.initials: CS
authors.lastname: Garudadri
mesh_terms: D000328:Adult; D000368:Aged; D003315:Cornea / Q000503:physiopathology; D003430:Cross-Sectional Studies; D005260:Female; D005901:Glaucoma / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009412:Nerve Fibers; D012160:Retina / Q000503:physiopathology*; D055351:Retinal Neurons / Q000502:physiology*; D057109:Scanning Laser Polarimetry / Q000379:methods*; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence / Q000379:methods*; D058609:Visual Field Tests; D014794:Visual Fields / Q000502:physiology