A Treatise on the Physiology and Diseases of the Eye:: Containing a New Mode of Curing Cataract Without an Operation; Experiments and Observations on Vision, Also on the Inflection, Reflection, and Colours of Light; Together with Remarks on the Preservation of Sight, and on Spectacles, Reading-glasses, &c, Volumen1

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Longman, Rees, Orme, Brown, Green, and Longman, 1833 - 222 páginas

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Página 137 - Truly the light is sweet, and a pleasant thing it is for the eyes to behold the sun...
Página 187 - ... and it often happens that the rays must be made not only to diverge less than before, but even to converge towards a focus behind such an eye, in order to make its vision distinct. Presbyopic persons have in general a small pupil, and, therefore, seldom acquire the habit of covering any part of it with their eyelids.
Página 49 - Calmuck had not perceived, at ihe estimated distance of thirty versts, the smoke and dust of the hostile army' and pointed it out to other equally experienced eyes, when the commander, Colonel Kischinskoi, could discern nothing with a good glass.
Página 123 - The characteristic features of this disease are the extraordinary slowness of its progress, the peculiar condition of the edges and surface of the ulcer, the comparatively inconsiderable suffering produced by it, its incurable nature, unless by extirpation, and its not contaminating the neighbouring lymphatic glands.
Página 147 - Thus he commences with characteristic boldness and confidence : — " It has always appeared wonderful to me, since Nature seems to delight in those close analogies which enable her to preserve simplicity and even uniformity in variety, that there should be no dispositions in the parts of light, with respect to inflection and reflection, analogous or similar to their different refrangibility. In order to ascertain the existence of such properties, I began a course of experiments and observations,...
Página 51 - ... the posterior portion very thick, almost cartilaginous. The whole eyeball was surrounded with very strong muscles ; and it may be easily understood how their action, modified according to circumstances, produces the requisite changes ; how the axis of the eye is shortened when the animal sees in the air, by bringing the lens nearer to the back of the globe, in order to obviate the strong refraction which the rays of light undergo in PHOCID^E.
Página 168 - ... to adjust itself to the veil's vibrations, that I have known not a few young ladies who have brought on great visual debility by this means alone. Again, tight clothing is manifestly hurtful to the sight ; for it needs not to be demonstrated, that the effective state of the eyes, as well as that of every part of the body, cannot be maintained without a free circulation of blood, which is obstructed when the body is too straitly laced or buttoned.
Página 184 - Rays converge sooner, so as to convene distinctly at the bottom of the Eye if the Glass have a due degree of convexity. And the contrary happens in shortsighted Men whose Eyes are too plump. For the Refraction being now too great, the Rays converge and convene in the Eyes before they come at the bottom; and therefore the Picture made in the bottom and the...
Página 120 - ... application of a small blister to the nape of the neck, or behind the ears, which should be kept open some weeks. After the chronic inflammation is subdued, the cataract is to be touched every morning with a solution of the potassa cum calce, beginning with a weak solution, and increasing it gradually. In the incipient stage of cataract I am convinced much good may be done, and a cure effected ; but when the disease is become confirmed, and the patient is old and feeble, there is little to be...
Página 48 - have a fine nose, a good ear, and an extremely acute eye. On their journeys and military expeditions, they often smell out a fire or a camp, and thus procure quarters for the night, or obtain booty. Many of them can distinguish, by smelling at the hole of a fox or other animal, whether the creature be there or not. By lying flat, and putting their...

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