title: The PERG in diabetic glaucoma suspects with no evidence of retinopathy.
abstract: OBJECTIVE
  To better understand the role of diabetes mellitus on retinal ganglion cell function of glaucoma suspects.
  
  
  METHODS
  Eighteen diabetic glaucoma suspects (GSD) without retinopathy (type-2, n=16, type-1, n=2) and 156 age-matched glaucoma suspects (GS) without diabetes were tested with steady-state pattern electroretinogram (PERG, PERGLA paradigm, Ophthalmology 2004,111:161) as surrogate measure of retinal ganglion cell function. Results were compared with previously published data of 48 similarly aged normal controls (NC). All subjects (NC, GS, GSD) had small refractive errors and corrected visual acuity > or =20/25.
  
  
  RESULTS
  The mean PERG amplitude of both GS and GSD was significantly (P<0.01) smaller than that of age-matched NC. The mean PERG amplitude of GSD patients was significantly (P<0.05) smaller than that of GS accounting for individual differences in age, visual acuity, visual field defect, and intraocular pressure. The mean PERG phase did not differ between GS and GSD.
  
  
  CONCLUSIONS
  In agreement with previous studies, our results show that on average, GS have reduced PERG amplitude compared with NC. PERG amplitude is further reduced in GSD compared with nondiabetic GS with otherwise comparable ophthalmologic and systemic conditions.
authors.affiliation: Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 900 NW 17th Street, Miami, FL 33136, USA.
authors.forename: Lori M
authors.initials: LM
authors.lastname: Ventura
authors.forename: Iuri
authors.initials: I
authors.lastname: Golubev
authors.forename: William J
authors.initials: WJ
authors.lastname: Feuer
authors.forename: Vittorio
authors.initials: V
authors.lastname: Porciatti
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D003315:Cornea / Q000473:pathology; D003922:Diabetes Mellitus, Type 1 / Q000150:complications*; D003924:Diabetes Mellitus, Type 2 / Q000150:complications*; D004596:Electroretinography / Q000379:methods*; D005901:Glaucoma / Q000150:complications* / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D007429:Intraocular Pressure; D008875:Middle Aged; D009898:Optic Disk / Q000473:pathology; D014786:Vision Disorders / Q000150:complications; D014792:Visual Acuity; D014794:Visual Fields