The diseases of the eye / by Edward Nettleship.

  • Nettleship, Edward, 1845-1913.
Date:
1890
Catalogue details

Licence: Public Domain Mark

Credit: The diseases of the eye / by Edward Nettleship. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

    458/508 (page 434)
    oycliiill, iiiul ill tlio treatment, of suppuriiLiiiy ulcers of the coi'iioa. Horiieic; Acid in very fine powder iiiiiv l>e used for diistiiif,' on to tlu! cornea in (rases of severe sii|)])urating ulcer; it causes scarcely any jiaiu and may bo apijlied as often as three times a <I;iy (]). 112). Tlic crystals are dilKcult to jiowder tiiiely, liut an almost impalpable amorphous powder, obtained by jireventinff refjnlar crystuilisatioii, can Ik; had. Mr Martiudah^ has made fen- me some soluble styles con- tailiiiii^ about ()() ])er cent, of boracie acid for use in cases of lacrimal obstruction with niucii secretion of mucus (]). 7H). Solutions of boric acid often tarnish steel; inslrumeids should therefore not be left in them. BoKic Acid Ointment (B. P. 1885): Boric Acid G8 gr. to of Paraffin. €auiiolic Acid Lotion : 29. Absolute Plienol 5, Water by wei^-ht 100. Used ill ])urulent ophtliahiiia. It is imiiortant to use abso- lutely ])iire carbolic acid for the coiijiiuctiva. Severe irritation ■often follows if any otlier varieties are employed. Lotion of Salicylic Acid is so irritating to the surface of the ■eye that it can seldom be used. 'I'he same objection ni)])lics to salicylic wool used for dressing the eye after operations. 30. COCAIN. Coeain was brought into clinical use in September, 1S84, at Vienna, and in London and elsewhere early in October. A 2 per cent, solution of a salt of cocain dropped into the con- junctival sac causes smarting for about lialf a minute, followed by numbness, rising to complete anajstliesia of ocular conjunctiva jind cornea in about two to five minutes; in three to five minutes after tlie maximum is reached, feeling begins to return, but slight numbness continues for about twenty minutes. There is often a feeling of coldness, as sensation is retnriiing. Cocain also causes widening of the pal])ebral fissure by retraction of the upper and lower lids, whitening of eyeball from contraction of blood-vessels, mydriasis, very slight weakness of Ace, and perhaps lowering of the eye tension. These effects last about half an hour, except the mydriasis, which remains in some de- gree about twenty-four hours. The jnipil dilated by cocain remains active to light and Acc.; if atropine be added the pupil becomes larger than from either drug singly. Eserine quickly and fully overcomes the effect of cocain. Acc. is com- pletely paralysed for a very short time if cocain be used every few minutes for about an liour. These effects of cocain (except the last) are explicable on the supposition that it causes spasm