Page:Plates illustrating the natural and morbid changes of the human eye.djvu/37

Rh with the red portions of the vessels. The red vessels disappear beneath the margin of the grey and opaque substance.

Along the lower margin of the optic disc we observe a slight deviation of the retinal vessels at the spot where they pass from the retina into the optic disc u also in this part of the retina the vessels have an abnormally dark-red colour.

"We infer from the alteration in the course, colour, and width of the retinal blood-vessels that the attachments of the retina to the choroid have become loosened by effusion of fluid between the choroid and retina.

Fig. 35. Anæmia and atrophy of the optic disc and the retina.

The optic disc and the tunics immediately adjoining it.

The pale bluish-white and opaque optic disc occupies the middle of the figure. Two thin blood-vessels (veins) pass through the disc, and disappear close to each other near its outer margin.

A narrow white crescentic ring of sclerotic is seen skirting the margin of the optic disc.

Erom the turbid red colour round the optic disc, we infer the choroid to be morbidly altered (? inflamed).

The blood-vessels in the retina are few in number, thin, and unequally dilated. At the margin of the optic disc they appear particularly thin, and bend round the margin of the optic disc, as if the latter was somewhat cupped. In the retina the vessels are unequally dilated and very indistinct in some parts, as is often seen in the later stages of choroidoretinitis.

Fig. 36.

''Chronic choroido-retinitis. Left eye.''

The optic disc and the tunics immediately adjoining it.

The optic disc occupies the middle of the figure. Its position can only be recognized by three extremely thin blood-vessels of the retina which meet in the disc.

The dirty brownish-red colour of the figure is attributed to products of inflammation, especially in the choroid and in the connective tissue of