Text book of veterinary medicine, Volume 3 (of 5)Law, James
Science
Text book of veterinary medicine, Volume 3 (of 5)
Law, James
Veterinary medicine
6th. =The weeping eye.= This is always a condition of disease. It may be
due to irritant gases, or solid particles, to inturned cilia, everted
lids, conjunctivitis or a variety of other conditions. A careful
examination may show whether it is only a transient and remediable fault
of a good eye or a permanent and irremediable defect.
7th. =The blear eye.= With swelling and scabbing of the edges of the
lids and Meibomian glands, and congestion of the adjacent conjunctiva,
there is usually some blurring of the surface of the transparent cornea.
The trouble is mostly chronic and constitutes a serious objection.
8th. =The watch eye.= In this, as in the albino, there is a lack of
pigment, so that the iris and sclerotic are white or bluish white in
part or in whole. Such an eye may be good and durable, but not beautiful
nor attractive.
9th. =Blindness of one or both eyes.= In all such cases the pupil
remains fixed and immovable, showing no accommodation to light and
darkness, and there is a lack of prompt responsiveness on the part of
the eye to sounds and objects. In amaurosis, glaucoma and cataract
especially, the pupil remains widely open, and alert movements of the
ears are employed to make up for the lack of sight. The condition often
comes from internal ophthalmia, such as the recurrent form, and is
associated with atrophy of the bulb.
10th. =Eyes of unequal size.= This usually implies serious disease in
one, not infrequently recurring ophthalmia.
11th. =Too flat corneal surface.= In this case there is a manifest lack
of the normal projection, the anterior surface of the cornea describing
the arc of a larger circle, the visual rays coming from a distance alone
converge on the retina and presbyopia occurs. In this as in myopia and
other visual imperfections a horse is liable to stumble and, if nervous,
to shy.
12th. =Ovoid Cornea.= In such cases the front of the transparent cornea
has an ovoid outline the arc formed by it in one direction being that of
a greater circle, than the arc which crosses this at right angles. In
consequence of this, the rays impinging on the outer portions of these
respective arcs do not converge to the same point on the retina and a
blurred and imperfect image results. This astigmatism causes the subject
to stumble and, if nervous, to shy.
SYSTEMATIC INSPECTION OF THE EYE.
System in Examination. Eyelids: cilia: lachryneal puncta: mucosa,
light pink, brick red, yellow, puffy, dropsical: Ciliary vessels deep,
immovable; nictitans; transparent cornea equally smooth, glossy, with
clear image at all points: foreign body on cornea: corneal ulcer:
opacities in aqueous humor: iris and pupil: corpora nigra: changes in
passing from darkness to light: pupillary membrane: adhesions of iris:
intraocular pressure: contracted pupil: hole in iris. Oblique focal
illumination of cornea, aqueous humor, iris, lens, Purkinje-Sanson
images.
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