Page:Plates illustrating the natural and morbid changes of the human eye.djvu/36

30 obtained on ophthalmoscopic examination from behind the pupil, the appearance represented in Pig. 32 was observed.

(Prom dissection of an eye, in which a similar appearance was observed before excision, it is inferred that the appearance represented in Pig. 32 is the result of haemorrhage from a blood-vessel of the strongly-pigmented choroid. The blood was effused between the choroid and sclerotic; it also perforated the retina and escaped into the vitreous chamber.)

{{center|Fig. 33.

A view taken two years later of the parts of the eye represented in Fig. 32.

The oval-shaped black patch in the middle of the figure represents an accumulation of pigment upon the choroid round a greenish-white atrophic portion. The haemorrhage is supposed to have proceeded from this spot. The choroid (the red surface) adjoining it is more or less atrophic, and gradually shades off into more vascular choroid.

In the lower part of the figure we observe a thin blood-vessel of the retina.

{{center|Fig. 34.}} "Displaced retina." Left eye.

The optic disc and the sclerotic choroid and retina immediately adjoining it.

The yellowish pink optic disc occupies the middle of the figure. Near its margin and adjoining it we observe a part which has an opaque greyish-white colour.

(Slight movements of the eyeball produced an undulating movement of this opaque part, and of the blood-vessels in it.)

The rest of the figure has a pinkish-grey colour.

"We notice an alteration of the colour of those blood-vessels of the retina, which from the optic disc go upwards, and which are distributed in the grey-white and opaque part. The vessels, instead of appearing red, as they do over the pinkish part, appear as black undulating lines. This change in colour is accompanied by alterations in the course and with of the blood-vessels. The latter appear larger, and no longer on a level