A Treatise on the Diseases of the Eye

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J. & A. Churchill, 1873 - 831 pages
 

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Page 651 - When the portion of the capsule which is of such importance in the tenotomy has been completely separated from the conjunctiva, I divide the insertion of the tendon from the sclerotic in the usual manner, and extend the vertical cut, which is made simultaneously with the tenotomy, upwards and downwards — the more so if a very considerable effect is desired. The wound in the conjunctiva is then closed with a suture.
Page 574 - ... diffusion-images still existing in a vertical direction cover one another on the vertical stripe. On the other hand, in order to see a horizontal stripe acutely, it is necessary only that the rays of light diverging in a vertical plane should unite in one point upon the retina. Now horizontal lines are acutely seen, as I have remarked, at a shorter distance than vertical ones, consequently rays situated in a vertical plane, which are refracted in the vertical meridian of the eye, are more speedily...
Page 555 - There can be no doubt -that the degree of short-sightedness is often greatly increased during childhood by long-continued study, more especially by insufficient illumination, and a faulty construction of the tables or desks at which the pupils read and write.
Page 566 - The refractive power of the eye is so low, or its optic axis so short, that when the eye is in a state of rest, parallel rays are not united upon the retina, but behind it, and only convergent rays are focussed upon the latter.
Page 4 - We may easily calculate the degree of the acuteness of vision thus : " The utmost distance at which the types are recognised (d) divided by the distance at which they appear at an angle of 5 minutes (D), gives the formula for the acuteness of vision (V).
Page 642 - Commencing at the optic foramen, and loosely embracing the optic nerve, the sheath expands, and passes on to the eyeball, which it encloses. It is loosely connected with the sclerotic by connective tissue — so loosely, indeed, as to allow of the free rotations of the globe within it. At the equator of the eyeball it is pierced by the tendons of the oblique muscles, and, more anteriorly, by the tendons of the four recti muscles, with which it becomes blended ; being finally lost on, rather than...
Page 290 - ... pupil remains central and moveable ; the sight is perfect, and is not at all deteriorated and confused by circles of diffusion upon the retina, which are always more or less present when an iridectomy has been performed. It must, however, be confessed that these great advantages are often more than counter-balanced by the considerable dangers which beset the operation. On account of the great size of the flap, there is much risk of the vitality of the cornea becoming impaired, and of its undergoing...
Page 772 - ... from the palpebral margin, is made at once down to the cartilage in a similar direction to the first ; and at a distance of a line or more, and joining it at both extremities ; these two incisions are then continued deeply into the cartilage in an oblique direction towards each other. With a pair of forceps the strip to be excised is seized and detached with the scalpel.
Page 275 - ... following this advice you will escape many unpleasant contretemps. I know of no surgical operation which is so safe and so sure in its cure as that for strabismus when properly performed. Let us now pass on to the description of Von Graefe's operation. As it is sometimes very painful, the patient should be placed under the influence of chloroform. The eyelids are to be kept apart by the spring speculum, or, if this proves not sufficiently strong, by the broad silver elevators. An assistant should...
Page ix - Wells upon the enccess with which he has fulfilled his ideal, as represented in the preface, in prodncing " an English treatise on the diseases of the eye, which should embrace the modern doctrines and practice of the British and Foreign Schools of Ophthalmology.

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