By Carl D. Regillo MD
Studies the fundamental anatomy of the retina and diagnostic methods to retinal sickness. comprises broad examinations of issues of the retina and vitreous, together with illness, irritation, hereditary dystrophies, abnormalities and trauma. Discusses laser treatment and vitreoretinal surgical procedure. final significant revision 2008-2009.
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Extra info for 2011-2012 Basic and Clinical Science Course, Section 12: Retina and Vitreous (Basic & Clinical Science Course)
ICG is also useful in delineating the ab normal aneurysmal outpouchings of the inner choroidal vascular network seen in idiopathic polypoidal choroidal vasculopathy and the focal areas of choroidal hyperpermeability in central serous chorioretinopathy, in differentiating abnormal vasculature in intraocular tumors, and in distinguishing the abnormal fluorescence patterns seen in choroidal inflammatory conditions such as serpiginous choroidopathy, acute multifocal placoid pigment epitheliopathy (AMPPE), multiple evanescent white dot syndrome (MEWDS), birdshot retinochoroidopathy, and multi focal choroiditis.
Corneal electroretinograms in childre n without sedation. ) 42 • Retina and Vitreous The ERG can also be used to estimate the extent of damagefrom tratuna or from drug toxicity. A reasonable ERG signal behind opaque media, especially when a bright flash is used, indicates that the retina is attached and functional. Cataracts do not appreciably affect the ERG, but the bright-flash technique is necessary for eyes filled with blood. The ERG can help determine whether a retained foreign body is causing siderosis or other toxic damage and can document damage from drugs such as thioridazine or chloroquine.
The centra l macular region has marked decreased waveform amplitudes (A) compared to the reference trace s (8). J CHAPTER 3, Retinal Physiology an d Psychophysics. 39 Bright-flash ERG The ability to perform vitrectomies and repair retinal trauma has led to an active interest in judging retinal function in eyes with opaque media. The bright-flash ERG is performed with a flash stimulus that is brighter than usual, such as a high-intensity photographic strobe. An unrecordable ERG indicates a poor prognosis due to widespread retinal damage, whereas a moderate signal (eg, 50 ~V) suggests that some salvageable retina does exist.
2011-2012 Basic and Clinical Science Course, Section 12: Retina and Vitreous (Basic & Clinical Science Course) by Carl D. Regillo MD