Page:Plates illustrating the natural and morbid changes of the human eye.djvu/32

26 optic disc were found to be situated upon the choroid, beneath the retina.

The small, round, yellowish white dot in the centre of each of the black spots is caused by the sclerotic shining through the atrophic transparent choroid.

The choroid immediately adjoining the atrophic portions is hypersemic, while in most other parts it is more or less atrophic; e. g. to the left of the optic disc we observe a group of red and pink patches; the latter are supposed to be portions of choroid in a state of commencing atrophy.

PLATE IX.

Fig. 25.

The region of the yellow spot of the eye from which Fig. 24 is taken. The brilliant white, yellowish-white, and pale pink patches were found to be more or less transparent atrophic portions of choroid, subtended by white sclerotic, and covered by transparent retina.

The transition from the healthy to the atrophic portion of choroid is abrupt along the upper margin of the white patch, and shades off gradually at its lower margin.

The blood-vessels which pass across the white patch belong to the retina. The latter, though transparent over the patch, was found adherent to it, and its minute structure much altered.

The atrophic changes of choroid and retina, represented in Pigs. 24, 25, were the results not of distension of the tunics, as in myopia, but of inflammation.

Fig. 28. (Left eye.) The optic disc, with a narrow strip of the tunics adjoining it, of a person suffering from acute glaucoma of the fellow eye.

Fig. 27. The optic disc with the tunics imynediately adjoining it, as it appeared 24 hours after an attack of acute glaucoma.

In Pig. 26 we see the same optic disc, &c., represented three days after iridectomy had been performed on the eye.