title: Measurement of distance objective visual acuity with the computerized optokinetic nystagmus test in patients with ocular diseases.
abstract: BACKGROUND
  To evaluate the efficacy of a computerized optokinetic nystagmus (OKN) test for determination of objective visual acuity (VA) at distance in patients with various ocular diseases.
  
  
  METHODS
  This is a prospective, non-interventional study that included 85 eyes of 71 patients with one or more ocular pathologies. Study patients were classified into group C (39 eyes of 30 patients with central visual damage), group P (24 eyes of 20 patients with peripheral visual defect) and group M (22 eyes of 21 patients with media opacity). Objective distance VA was measured with OKN induction and suppression methods, and the correlation between the objective and subjective VA at distance was evaluated using linear regression analysis. Mean subjective VAs were compared among each objective VA step and among the three groups.
  
  
  RESULTS
  Significant correlation was found between subjective distance VA and objective VA determined by both OKN induction and suppression methods in all three groups and in overall patients. In overall patients, the mean subjective VA was significantly different in several objective VA steps (Welch's ANOVA, p < 0.001 for induction and suppression methods). No significant difference in subjective VA among the three groups was found in any objective VA step.
  
  
  CONCLUSIONS
  Our objective VA test using OKN induction and suppression methods can be useful in estimating distance VA in patients with various ocular diseases.
authors: Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 166 Gumiro, Bundang-gu, Seongnam, Gyeonggi-do 463-707, Korea.
authors: Sang Beom
authors: SB
authors: Han
authors: Eun Ryung
authors: ER
authors: Han
authors: Joon Young
authors: JY
authors: Hyon
authors: Jong-Mo
authors: JM
authors: Seo
authors: Jin Hak
authors: JH
authors: Lee
authors: Jeong-Min
authors: JM
authors: Hwang
references: Vision Res. 1981;21(7):985-94
references: 7314502
references: Optom Vis Sci. 2009 Aug;86(8):988-95
references: 19609232
references: Vision Res. 1986;26(7):1155-62
references: 3798750
references: Pediatrics. 1957 Jun;19(6):1088-92
references: 13441362
references: Brain Res. 1986 Sep 24;383(1-2):185-94
references: 3768688
references: Perception. 2005;34(8):1015-24
references: 16178157
references: Klin Monbl Augenheilkd. 1999 Jun;214(6):395-400
references: 10427543
references: Albrecht Von Graefes Arch Ophthalmol. 1957;159(2):180-90
references: 13520512
references: Invest Ophthalmol Vis Sci. 2002 Jun;43(6):1804-8
references: 12036982
references: AMA Arch Ophthalmol. 1958 Sep;60(3):418-21
references: 13570765
references: J Neuroophthalmol. 2001 Mar;21(1):42-5
references: 11315983
references: Am J Ophthalmol. 2006 Feb;141(2):327-32
references: 16458689
references: Br J Ophthalmol. 1997 Feb;81(2):123-9
references: 9059245
references: J Neurosci Methods. 2004 Sep 30;138(1-2):7-13
references: 15325106
references: Invest Ophthalmol Vis Sci. 2010 Feb;51(2):752-7
references: 19834033
references: Invest Ophthalmol Vis Sci. 2007 Oct;48(10):4542-8
references: 17898276
references: Exp Brain Res. 1988;70(3):597-604
references: 3384058
references: Hum Neurobiol. 1982;1(2):111-9
references: 7185785
references: Eur Neurol. 1986;25(6):454-7
references: 3792405
references: Jpn J Ophthalmol. 1990;34(2):239-44
references: 2214366
references: Vision Res. 1984;24(9):969-76
references: 6506484
references: J AAPOS. 2006 Dec;10(6):552-60
references: 17189150
references: Exp Brain Res. 1975 Aug 14;23(2):129-39
references: 1183500
references: Duodecim. 1962;78:285-8
references: 13926502
references: Arch Ophthalmol. 1973 Dec;90(6):449-52
references: 4759430
references: Br J Ophthalmol. 2001 Feb;85(2):169-72
references: 11159480
references: Doc Ophthalmol. 2002 May;104(3):249-76
references: 12076015
references: Vision Res. 1991;31(12):2219-25
references: 1771801
references: Ophthalmology. 2007 Dec;114(12):2332-7
references: 17618689
references: Am J Optom Arch Am Acad Optom. 1969 Dec;46(12):938-45
references: 5262337
references: AMA Arch Ophthalmol. 1951 Jun;45(6):704-25
references: 14902186
references: Dev Ophthalmol. 1984;9:130-2
references: 6526099
references: Klin Monbl Augenheilkd. 1987 Aug;191(2):149-55
references: 3669509
references: Clin Exp Optom. 2005 Mar;88(2):97-102
references: 15807641
references: Graefes Arch Clin Exp Ophthalmol. 1995 Jan;233(1):8-12
references: 7721126
references: Invest Ophthalmol Vis Sci. 2009 Oct;50(10):4685-92
references: 19458334