Defects of Sight: Their Nature, Causes, Prevention, and General ManagementJ. Churchill, 1856 - 149 ページ |
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affected amaurosis amaurotic appear aqueous humour Asthenopy attack become blindness brain capsule cataract of old catarrhal concave glasses congenital congestion consequence convergent convex glasses cornea crystalline lens cured dark DEFECTS OF SIGHT degree depends derangement different distances dilated dioptric directed disease displacement distant objects distinctly double vision especially exciting causes eyeball eyelids far-sighted Far-sightedness fever Fixed muscæ floating muscæ focal length foci focus gonorrhoea hemiopy hemorrhoids hence impaired impressions incident rays infant inflammation injury internal inflammation iris iritis lachrymal lenticular cataract less liable looking matter musca muscle natural nerve night-blindness opacity opaque operation of extraction optic axes optic nervous apparatus owing paralysis patient perception persons phantasms phlyctenular photopsy power of adjustment Presbyopy pupil rays of light refractive media removed require retina rheumatism seen sensations sensibility short-sightedness skin smallpox spectrum squint strabismus strong light surface symptoms tion treatment upper eyelid usually vitreous body vitreous humour whilst yellow
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95 ページ - Is this a dagger, which I see before me, The handle toward my hand ? Come, let me clutch thee : — I ha-ye thee not, and yet I see thee still. Art thou not, fatal vision, sensible To feeling, as to sight ? or art thou but A dagger of the mind, a false creation, Proceeding from the heat-oppressed brain ? I see thee yet, in form as palpable As this which now I draw.
99 ページ - In this instance the loss of sight was toward my left, and was the same whether I looked with the right eye or the left. This blindness was not so complete as to amount to absolute blackness, but was a shaded darkness without definite outline. The complaint was of short duration, and in about a quarter of an hour might be said to be wholly gone, having receded with a gradual motion from the centre of vision obliquely upwards toward the left.
63 ページ - But we know that this is not the case. We know that we can see objects perfectly distinctly at different distances, within certain limits.
10 ページ - THE WISDOM AND BENEFICENCE OF THE ALMIGHTY, AS DISPLAYED IN THE SENSE OF VISION; being the Actonian Prize Essay for 1851.
77 ページ - This, it is obvious, would take place if the cornea, instead of being a surface of revolution, (in which the curvature of all its sections through the axis must be equal,) were of some other form, in which the curvature in a vertical plane is greater than in a horizontal. It is obvious, that the correction of such a defect could never be accomplished by the use of spherical lenses.
99 ページ - SON; the commencement of the name being wholly obliterated to my view. In this instance the loss of sight was toward my left, and was the same whether I looked with the right eye or the left. This blindness was not so complete as to amount to absolute blackness, but was a shaded darkness without definite outline. The complaint was of short duration, and in about a quarter of an hour...
99 ページ - It is now about fifteen months since a similar affection occurred again to myself, without my being able to assign any cause whatever, or to connect it with any previous or subsequent indisposition. The blindness was first observed, as before, in looking at the face of a person I met, whose left eye was to my sight obliterated. My blindness was in this instance the reverse of the former, being to my right (instead of the left) of the spot to which my eyes were directed ; so that I have no reason...
99 ページ - I could see but half the face of a man whom 1 met ; and it was the same with respect to every object I looked at. In attempting to read the name Johnson, over a door, I saw only son ; the commencement of the name being wholly obliterated to my view.
103 ページ - ... so modified by the passage of the rays through the two remaining lenses that the rays of all colours (as separated by the motion of the segment of the second lens) will enter the eye in a state of parallelism ; and, therefore, the separated images will appear coloured from this cause without respect to the part of the field of view in which they are seen. This failing is, perhaps, more important than the other, for it affects the estimation of the scale of the micrometer as well as the ordinary...
85 ページ - ... its shadow is not seen on the white ground, but when it is brought nearer and nearer the white surface, its shadow appears more and more distinctly. The particles, moreover, appear to be of normal occurrence in the eye, for the appearance of floating muscse may in general be seen by any person by simply looking through a small aperture in a card at the clear sky, or through the eyeglass of a compound microscope at the flame of a candle two or three feet distant, or simply by bringing the eyelids...