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Show .‘JU 01" THE I'ROTRUSIUN 0F T1113. IRIS. W branes, we must foment and apply poultices, not repellent cold applications. PROTRUSION OF THE IRIS. .. ‘trf - «vir- 2-." THE protrusion of the iris is marked by these characters. There is a small prominent tumour or speck on the cornea of the colour of the iris. Around its base the cornea is opaque. The pupil is a little removed from the centre, and somewhat changed from its regular form, and the plane of the iris is more oblique than natural; the vessels of the conjunctiva are large and numerous, and the eye is particularly irritable. 2;"4350w mom i i . t: \. Eg. This is a kind of hernia of the iris, which is apt to occur after the operation of extracting the'eataract, or in consequence of wounds or ulcers of the cornea penetrating to the chamber of the aqueous humour. This is not a relaxation and falling down of the iris, but it is pushed out as an intestine is in hernia, by the contraction of the eyeball, and in ,. DROPSY OF THE EYE. LIKE every other part of the body the vessels of the eye receive a constitutional disposition that keeps the form and proportions of the humours and coats to a limited form. If this natural action of vessels be changed, the eit‘eet is some defect of transparency, or some preternatural growth; there is an atrophy or wasting of the eye, or a great increase of the humours, a distension and growth of the coats-a dropsy of the eye. Dropsy is sometimes a consequence of injury done to the ed too like a hernia. It is impossible to reduce this protrusion when it is the consequence of ulcers of the cornea; for supposing that the iris was separated from the cornea, vould not the aq eons humour again be discharged, would not the lens again press forward the iris, so that it would be pushed through the opening of the cornea .9 The entangling and without any very evident cause. The symptoms are, a sense of distension with pain in the orbit and difficulty of moving the eyeball. Blindness ensues, and there is no longer contraction of the pupil. In a still greater degree of the disease, the eye projects conically from the eyelids, and they no longer shut upon the eyeball ; the exposed surface becomes acrid ; there is inflammation and ulceration of the eyelids; the eyeball is inflamed, with great pain and head-ache ; the other eye is attracted, by sympathy ; and an operation becomes absolutely necessary. Tue ()rnnk'riox is sufficiently simple. The eyelids are held open; a sharp tenaculum is thrust through the anterior hall‘ of the eyeball, and all the projecting part is cut oil' with two motions of the scalpel. The humours are of course spon- have to touch it with the lunar caustic; this must be done at caustic. After this we are to endeavour to promote the cicatrixation of the ulcer. In the same way are treated the small lymphatic tumours, which project from the cornea, after an ulcer or wound. Searpa proves that this tumour is the protrusion of the vitreous humour and its capsule. eye, or of high inflammation; sometimes it attacks slowly ing with the current of the aqueous humour, towards the opening; but, as I have described in speaking of the extraction of the cataract, the whole contents of the eye press forward to the breach, and the iris presents lirst. It has been well observed that this presenting of the iris in the ulcer, saves the eye from total destruction, though it be a painful disease in itself. The practice in this disease is simple. We 6": 5 1‘5...» f.:-.W '. .. t5? the narrow opening of the cornea it is sometimes strangulat- of the iris in the ulcer is not owing to this membrane float- f'w"‘ ,i unorsv or THE EYE. with the precautions already recommended ; the small black tumour formed by the protruded iris must be eat down within the level of the cornea by repeated application of the taneondy evacuated, and the eye shrinks within the eyelids. But Scarpa again frightens us, and recommends instead of this, that the middle of the cornea be cut, as in the Sta~ phyloma. |
