#PIGMENTED LATTICE DEGENERATION CODE#

These charts should be considered only as diagrammatic projections inwhich the retina anterior to the equator is disproportionately expanded, thatis, features of the peripheral retina are actually closer togetherthan they appear in the conventional fundus diagram. Consequently, conventional charts of the ocular fundus, which depictthe ora serrata as having a diameter and circumference greater than thatof the equator, are misleading (see Fig. The retina is considerably smaller in diameter and in circumference atthe ora serrata than at the equator (see Fig. Measurements and standarddeviations given in millimeters. Retinal shape resembles a cup expanded to its greatest diameter at theequator and reduced in diameter at the ora serrata. Thus, the retina has the shape of a cup that is expanded to its greatestdiameter at the equator and is considerably reduced in diameter atits serrated anterior margin.įig. From the equator to the ora serrata, the retina diminishesin size so that at theora serrata the average retinal diameter is 20.41 ☑.09 mmvertically and 20.03 ± 1.04 mm horizontally ( Fig. The retina expands from the optic disc to line the posterior pole and reachthe equator, where it has an average diameter of 24.08 ± 0.94 mmin the vertical meridian and 24.03 ± 1.04 mm in the horizontalmeridian. Average measurementsand standard deviations given in millimeters. Relationship of ora serrata to equator andto Schwalbe's line in the four principal meridians. Fromthe ora serrata to Schwalbe's line, which constitutesthe posteriorborder of the limbus, the distance is 6.14 ± 0.85 mmsuperiorly, 6.20 ± 0.76 mm inferiorly, 5.73 ± 0.81 mmnasally, and 6.53 ± 0.75 mm temporally ( Fig. The average dimensionsof the retina of the adult from the equator to the ora serrata are 5.07 ± 1.11 mmin the superior meridian, 4.79 ± 1.22 mm inferiorly, 5.81 ± 1.12 mm nasally, and 6.00 ± 1.22 mm temporally. St Louis: CV Mosby, 1969.)Įxamining the peripheral retina and recording the findings require accurateand detailed knowledge of normal topography, anatomic relationships, commondevelopmental variations, significant degenerations, and themanifestations of specific disease entities.įor topographic evaluation, the general size and shape of the peripheralretina and related structures are important. In: Transactions of the New Orleans Academy of Ophthalmology: Symposiumon Retina and Retinal Surgery. (Straatsma BR, Foos RY, Spencer LM: The retina: Topography and clinicalcorrelations. Radiating lines represent meridians numbered accordingto clock hours. Inner circle represents equator of eye middle circlerepresents ora serrata outer circle represents anterior border ofpars plana ciliaris.

#PIGMENTED LATTICE DEGENERATION CODE#

1) using a standardized color code ( Table 1).įig.

Thephysician's observations are recorded on an ocular fundus chart ( Fig. This important segment ofthe retina and the structures lying anteriorly and posteriorly as wellas internally and externally may be readily visualized with the techniquesof ophthalmoscopy, biomicroscopy, and scleral depression. The peripheral retina may be defined somewhat arbitrarily as the anteriorportion of the retina that begins about 3 mm posterior to the equatorof the eye, where the conspicuous vortex veins pass from the choroidinto the sclera and extend forward past the equator to the anteriortermination of the retina at the ora serrata. TRACTIONAL PERIPHERAL RETINAL DEGENERATIONS TROPHIC AND TRACTIONAL PERIPHERAL RETINAL DEGENERATIONS

Degenerative Diseases of the Peripheral Retina Chapter 26ĭegenerative Diseases of the Peripheral Retina

Pigmented lattice degeneration