The student's guide to diseases of the eye . part of a re-tinitis or papillo-retinitis. A haemorrhage whichis mottled and of dark, dull colour, is generally rate of absorption varies very greatly; haemor-rhages after blows are very quickly absorbed, whilethose depending on rupture of diseased vessels inold people, or accompanying albuminuric retinitis,generally last for months, and often leave permanenttraces. Pigmentation of the retina has been referred toin connection with choroiditis (p. 170). Wheneverpigment in the fundus forms long, sharply-definedlines, or is arranged in a mossy,
The student's guide to diseases of the eye . part of a re-tinitis or papillo-retinitis. A haemorrhage whichis mottled and of dark, dull colour, is generally rate of absorption varies very greatly; haemor-rhages after blows are very quickly absorbed, whilethose depending on rupture of diseased vessels inold people, or accompanying albuminuric retinitis,generally last for months, and often leave permanenttraces. Pigmentation of the retina has been referred toin connection with choroiditis (p. 170). Wheneverpigment in the fundus forms long, sharply-definedlines, or is arranged in a mossy, lace-like or reticu-lated pattern, we may always safely infer that it issituated in the retina, and generally that it lies alongthe sheaths of the retinal vessels (compare Fig. 75with Fig. 72). Pigment in or on the choroid never takessuch a pattern, being usually in blotches or two types, however, are often mingled in cases ofchoroiditis with secondary affection of the retina;indeed, in every case where we decide that the retina. 188 DISEASES OF THE RETINA is pigmented the choroid must be carefully examinedfor evidences of former choroiditis. Spots of pigment may be leftafter the absorption of retinal haemor-rhages. Such spots can generally bedistinguished from those followingchoroiditis by their more uniformappearance and by the absence ofFig. Study si£ns of choroidal atrophy,of pigment in Atrophy of the retina, of which pig-the retina in a mentation of the retina, when pre-specimen of se- sent, is always a sign, has for its mostcondary retinitis constant indication a marked shrink-8SHh?faS£ *???* the retinal blood-vessels and(vitreous) sur- thickening of their coats. When theface. atrophy follows a retinitis or cho- roido-retinitis (retinitis pigmentosa,syphilitic choroido-retinitis, &c.) all the layers areinvolved, and the outer layers (those nearest thechoroid) earlier than the inner; but when it is se-condary to disease of the optic nerve (optic neu-ritis
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