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6 Result(s)

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  1. No Access

    Article

    Investigation of the temporal properties of the retina using the m-sequence

    The mfERG provides a topographic map of function of the retina and has been used in numerous studies to identify macular, paramacular and peripheral retinal dysfunction. This study investigates the changes in ...

    Richard P. Hagan, Anthony C. Fisher, Malcolm C. Brown in Documenta Ophthalmologica (2011)

  2. No Access

    Article

    Deficits in the electroretinogram in neovascular age-related macular degeneration and changes during photodynamic therapy

    To describe the deficits in four electroretinography (ERG) modalities in patients with neovascular age-related macular degeneration (AMD). To describe the changes in these parameters during a course of vertepo...

    Alison M. Mackay, Malcolm C. Brown, Richard P. Hagan… in Documenta Ophthalmologica (2007)

  3. No Access

    Article

    Automatic positioning of cursors in the transient pattern electroretinogram (PERG) with very poor SNR using an Expert System

    An expert system is described which automatically cursors PERG waveforms of very poor signal-to-noise ratio. The training data-set is derived from shape-perturbated PERG waveforms based on the ISCEV Standard and ...

    Anthony Colin Fisher, Richard P. Hagan, Malcolm C. Brown in Documenta Ophthalmologica (2007)

  4. No Access

    Article

    Examination of short binary sequences for mfERG recording

    The mfERG, when first introduced by Erich Sutter used long sequences with short periods (∼15 ms) between steps (flashes). Since then a number of studies have introduced slower or modified sequences to emphasis...

    Richard P. Hagan, Anthony C. Fisher, Malcolm C. Brown in Documenta Ophthalmologica (2006)

  5. No Access

    Article

    Congenital absence of optic chiasm: demonstration of an uncrossed visual pathway using monocular flash visual evoked potentials

    A 35 month old child was referred for electrophysiology testing with pendular nystagmus, corresponding head oscillations and reduced vision. Flash visual evoked potential (VEP) revealed large responses at the ...

    Malcolm C. Brown, Caroline L. Southern, Arangasamy Anbarasu… in Documenta Ophthalmologica (2006)

  6. No Access

    Article

    Automated Post Hoc Removal of Power-Line and CRT Frame Pulse Contamination from Retinal and Cortical Evoked Potentials (EPs)

    Recordings of the ERG, PERG, VEP and their multi-focal variants are occasionally contaminated with harmonic noise arising from the mains supply and CRT monitors. These noise contributions can be modelled as di...

    Anthony C. Fisher, Azzam F. G. Taktak, Richard P. Hagan… in Documenta Ophthalmologica (2006)