OBJECTIVES: (1) To document variability of the full-field ERG within single recording sessions under ISCEV standards. (2) To identify clinical factors contributing to the observed variability. METHODS: Nine volunteer subjects were studied, aged 19-32 with no history of retinal disease. ISCEV standard ERGs were recorded. Dark-adapted "standard combined" and light-adapted "cone" b-wave amplitudes and implicit times were measured. Multiple flashes were presented at different interflash intervals and after different periods of dark and light adaptation. The stability of the stimulus flash was measured with a photometer. RESULTS: The statistical coefficient of variability was roughly 2.5% for the standard combined b-wave amplitude and 4.5% for the cone b-wave. B-wave implicit times showed a coefficient of variability of 2% for standard combined responses and 1.25% for cone responses. Variation in interflash interval, dark and light adaptation times, and sporadic unusual waveforms influenced measured b-wave amplitudes. CONCLUSION: Intrasession variability is much lower than previously reported values for intersession variability. Nonetheless, it represents a baseline of variability that will affect results and that may be minimized by recognition and control of contributing factors.
OBJECTIVES: (1) To document variability of the full-field ERG within single recording sessions under ISCEV standards. (2) To identify clinical factors contributing to the observed variability. METHODS: Nine volunteer subjects were studied, aged 19-32 with no history of retinal disease. ISCEV standard ERGs were recorded. Dark-adapted "standard combined" and light-adapted "cone" b-wave amplitudes and implicit times were measured. Multiple flashes were presented at different interflash intervals and after different periods of dark and light adaptation. The stability of the stimulus flash was measured with a photometer. RESULTS: The statistical coefficient of variability was roughly 2.5% for the standard combined b-wave amplitude and 4.5% for the cone b-wave. B-wave implicit times showed a coefficient of variability of 2% for standard combined responses and 1.25% for cone responses. Variation in interflash interval, dark and light adaptation times, and sporadic unusual waveforms influenced measured b-wave amplitudes. CONCLUSION: Intrasession variability is much lower than previously reported values for intersession variability. Nonetheless, it represents a baseline of variability that will affect results and that may be minimized by recognition and control of contributing factors.
Authors: Mieke M C Bijveld; Frans C C Riemslag; Astrid M L Kappers; Frank P Hoeben; Maria M van Genderen Journal: Doc Ophthalmol Date: 2011-09-27 Impact factor: 2.379
Authors: Yuyi You; Elizabeth C Graham; Ting Shen; Con Yiannikas; John Parratt; Vivek Gupta; Joshua Barton; Michael Dwyer; Michael H Barnett; Clare L Fraser; Stuart L Graham; Alexander Klistorner Journal: Neurol Neuroimmunol Neuroinflamm Date: 2017-12-15
Authors: Zhichao Wu; Xavier Hadoux; Flora Hui; Marc G Sarossy; Jonathan G Crowston Journal: Transl Vis Sci Technol Date: 2016-07-29 Impact factor: 3.283