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Sentences for "cornea "
" Steady the eye with fixation forceps; then pierce the cornea with the other syringe needle and allow the aqueous to escape through the needle.
Without removing the needle from the cornea attach the syringe and make the injection into the anterior chamber.
Make an incision through the upper quadrant of the cornea into the anterior chamber by means of a triangular keratome.
Next for the impression they make on the Retina, we will further examine this Hypothesis: Suppose therefore ABCDEF, in the fifth Figure, to represent the Ball of the eye: on the Cornea of which ABC two Rays GACH and KCAI (which are the terminating Rays of a luminous body) falling, are by the refraction thereof collected or converg'd into two points at the bottom of the eye.
And therefore according as this or that side, or end of the pulse shall be impeded, accordingly will the impressions on the Retina be varied; therefore by the Ray GACH refracted by the Cornea to D there shall be on that point a stroke or impression confus'd, whose weakest end, namely, that by the line CD shall precede, and the stronger, namely, that by the line AD shall follow.
And by examining the Cornea or outward skin, after I had stript it off from the several substances that lay within it, and by looking both upon the inside and against the light.
Upon the Anatomy or Dissection of the Head, I observ'd these particulars: First, that this outward skin, like the Cornea of the eyes of the greater Animals, was both flexible and transparent, and seem'd, through the Microscope perfectly to resemble the very substance of the Cornea of a man's eye; for having cut out the cluster, and remov'd the dark and mucous stuff that is subjacent to it, I could see it transparent like a thin piece of skin, having as many cavities in the inside of it, and rang'd in the same order as it had protuberances on the outside, and this propriety, I found the same in all the Animals that had it, whether Flies or Shell-Fish.
These eyes, to appearance, seem'd to be of the very same structure with that of larger binocular creatures, seeming to have a very smooth and very protuberant Cornea, and in the midst of it to have a very black pupil, incompassed about with a kind of grey Iris, as appears by the Figure; whether it were able to move these eyes to and fro, I have not observ'd, but 'tis not very likely he should, the pillar or neck C, seeming to be cover'd and stiffen'd with a crusty shell; but Nature, in probability, has supply'd that defect, by making the Cornea so very protuberant, and setting it so cleer above the shadowing or obstructing of its prospect by the body, that 'tis likely each eye may perceive, though not see distinctly, almost a Hemisphere, whence having so small and round a body plac'd upon such long leggs, it is quickly able so to wind, and turn it, as to see any thing distinct.
It had two pretty large black eyes on either side of the head EE, from one of which I could see a very bright reflection of the window, which made me ghess, that the Cornea of it was smooth, like those of bigger Insects.
The surface of the cornea may appear white and the blood-vessels prominent, but it is only in the severe cases that inflammation of this portion of the eye occurs.
As the inflammation progresses, the cornea becomes milky in appearance and the aqueous humor may show a precipitate toward the bottom of the anterior chamber.
The acute inflammation gradually subsides, and about the tenth to the fourteenth day the lids and cornea may appear normal.
The cornea becomes clouded, white and opaque.
In severe cases, the blood-vessels around the margin of the cornea become prominent, and ulcers form on its surface.
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