A practical treatise on the diseases of the eye / [John Vetch].

  • John Vetch
Date:
1820
Catalogue details

Licence: Public Domain Mark

Credit: A practical treatise on the diseases of the eye / [John Vetch]. Source: Wellcome Collection.

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    soft, and shews no resistance to pressure ; the sclerotica immediately round the cornea, as in very young persons, is blueish, and the sensibility to light varying; if the synechesis be not com- plete, there is only a suspicious softness in the eye, and a slight wavering of the iris. Another complication - not less difficult. to decide upon before the operation, is that with amaurosis ; for although it may be easy: some- times to distinguish this complication, it is in many. cases very difficult. When the pupil is very large, the iris is almost or altogether im- moveable, and the person cannot distinguish day from night, and consequently still less the smaller variations oflight ; no power of divination is neces- sary, says Beer, to prognosticate with certainty the failure of an operation to restore sight. to the patient; but if, on the contrary, the iris be nearly as moveable as ina sound state, the pupil as small as it ought to'be in such a degree of light, if the patient can tell distinctly all the variations of light, and if the cataract, notwithstanding, be united to an amaurosis which deprives the patient of all power of vision except sensibility to light, _it is only by a careful investigation of the history of the case, that we can find out such circum- stances as point out a simultaneous amaurotic blindness: the other eye being affected: with amaurosis but not with cataract, excites a well §
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