By Carl D. Regillo MD
Studies the fundamental anatomy of the retina and diagnostic ways to retinal affliction. contains broad examinations of issues of the retina and vitreous, together with affliction, irritation, hereditary dystrophies, abnormalities and trauma. Discusses laser remedy and vitreoretinal surgical procedure. final significant revision 2008-2009.
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Additional info for 2011-2012 Basic and Clinical Science Course, Section 12: Retina and Vitreous (Basic & Clinical Science Course)
Inner ret inal disease may selectively dimini sh the b-wave. (Reprinted with permission from Marmor Digest. 1979:41:13-29) MF. Th e management of retinitis pigmentosa and al/ied diseases. Ophtha lmology CHAPTER 3: Retina l Physiology and Psychophysics. 41 ti ming. ERG timing is most easily assessed using the 30-Hz flicker response, which normally shows a b-wave implicit tim e (stimulus-to-peak interval) ofless than 32 msec. The ERG can be useful in evaluating chronic ischemic damage from vascular disease.
Because the ERG measures a pan retinal response, it does not necessarily correlate with visual acuity, which is a function of the fovea. A number of factors may influence the amplitude and timing of the normal electroretinogram . /'--- Congenital stationary night bl indness (X-linked recessive) X-linked retinoschisis X-linked incomplete blue cone monochromat 100IJV L 20 msec Figure 3-2 Examples of ERG chan ges in retina l diseases. Note t hat some diseases are selective fo r th e co ne system, the rod system, or t he inner retina (b-wave).
The more viscous the solution, however, the more it interferes with the qu ality of any photography or angiography performed shortly after the examination. In contrast, non-contact lenses use the power of the lens in combination with the cornea to produce an"inve rted image with a wider field of view. The biconvex 19 20 • Retina and Vitreous indirect lenses used with the slit lamp do not touch the cornea, and thus topical anesthes ia is not necessary. In general, high-plus optical power lenses such as the 60, Super66 (which has a I: 1 image magnification ; Yolk Optical, Mentor, OH), 78, and 90 D lenses are used; however, more specialized lenses have been developed, including the Super Field, Super VitreoFundus, SuperPupil, Digital Wide Field, and Digital HighMag (all from Yolk Optical) and the Ocular Maxfield lenses (Ocular Instrum ents, Bellevue, WA).
2011-2012 Basic and Clinical Science Course, Section 12: Retina and Vitreous (Basic & Clinical Science Course) by Carl D. Regillo MD