138 WORM IN THE EYE. 



thereby causes the aqueous humour to spirt out with greater force, 

 thus affording more certainty of the escape of the worm. 



It being an affair of some consequence, that the opacity conse- 

 quent on the cicatrix left by the puncture should not be in a situ- 

 ation to interfere with useful vision, Mr. Molyneux thinks the 

 operation ought to be varied, in respect to the place chosen for 

 puncture, according to the kind of horse, or to the purpose for 

 which the subject is likely to be used. Draught horses, not re- 

 quiring vision backward, might have the incision made through 

 the supero-posterior part of the cornea ; saddle-horses, on the other 

 hand, through the superior part. And the instrument Mr. M. has 

 generally used is '' a trocar of the smallest size, having a little 

 tow rolled lightly a.round the perforator, leaving about a twelfth or 

 fourteenth of an inch of its point naked." Mr. M. finds the cicatrix 

 less after a puncture of this description than after lancing. Mr. 

 M. casts the horse for the operation. 



Mr. Skeavington, like Mr. Gibb, operates on the horse standing. 

 He punctures the central part of the cornea ; alleging that, by so 

 doing, he not only avoids all risk of wounding the iris, but ulti- 

 mately leaves the eye without blemish : there being, according to 

 his observation, always more or less opacity caused by the lateral 

 operation. 



After the Operation it is sometimes requisite to abstract 

 blood, either topically or constitutionally ; always to purge : and the 

 best application to the eye appears to be a compress soaked in cold 

 water. Should any deposits or opacities remain after the subsi- 

 dence of the inflammation and union of the cornea, stimulating 

 collyria, &c. may prove useful. 



Sequels. — Mr. Gibb informs us he has been very successful 

 in his operations ; and so perfect have they in many instances 

 proved, that no one could discover where the incision had been 

 made. In other cases, however, " a considerable speck" has re- 

 mained, and in some few, opacity has become permanently esta- 

 blished, notwithstanding every nicety and care have been used in 

 operating. In one of Mr. C. Percivall's cases an opacity followed 

 the incision — made with a small lancet through the postero-inferior 

 part of the cornea — of the dimensions of a sixpence, which in spite 



