When it arises from constitutional causes recurrence is frequent, leaving the corneal membrane more cloudy after each attack, until the sight is permanently lost.
This is an inflammation of the cornea proper, although the sclerotic at the corneal border becomes involved to some extent.
The right half of the face was anesthetic, but there was no corneal anesthesia.
The corneal reflexes were absent, and the nasal mucosa was anesthetic.
The corneal reflex was absent on the left side, diminished on the right.
The patient pulled out a crucifix from a locker near the bed and regarded it ecstatically (pulse 85, corneal reflexes preserved).
The laryngeal and corneal reflexes were absent and there was a hyperesthesia and hypalgesia of the right side of the body.
At a time when the corneal reflex was completely abolished, it was still impossible, with the exertion of the greatest strength, to flex the segments of the lower extremities.
The cornealand conjunctival reflexes were diminished, and the knee-jerk was unobtainable on the right side.
Thirty-one showed analgesia and absence of laryngeal and corneal reflexes.
Pupillary responses were lively, but the swallowing reflexes were diminished, and the corneal and conjunctival reflexes were absent.
November 27, after elaborate preparation to heighten the suggestive effect, the patient was kept in bed and given gas and ether up to the abolition of the corneal reflex.
Sometimes corneal anesthesia is found in non-hysterical persons, who may perhaps be regarded as potential hysterics.
Twenty-six showed pupillary changes and hyperreflexia, four of these latter showing also an absence of laryngeal and corneal reflexes.
The plantar reflex was, in fact, completely absent on the left side, as well as the corneal reflex.
The authors have personal knowledge of a case of spontaneous extrusion of the lens through a corneal ulcer, in a case of ophthalmia of the new-born.
Trioen mentions a curious case of expulsion of the crystalline lens from the eye in ophthalmia, through the formation of a corneal fissure.
These cells give rise in a later stage (not worked out in Astacus) to the cuticular corneal lenses.
The corneal corpuscles make their way through the structureless corneal layer, and divide it into two strata, one adjoining the epiblast, and the other adjoining the inner epithelium.
Descemet's membrane, grows in between the two, at a time when it is not easy to recognise a corneal lamina, as distinct from a simple coagulum.
After the formation of this layer the mesoblast cells grow into the corneal lamina from the sides, and becoming flattened arrange themselves in rows between the laminae of the cornea.
Vertebrate eye, and the corneal lenses and crystalline cones of the Crustacean eye, are independently formed from the epiblast after the separation of the part which becomes the central nervous system.
When the lens is completely separated from the epidermis its outer wall is directly in contact with the external epiblast (future corneal epithelium).
In all simple eyes the corneallens is formed by a thickening of the cuticle.
The outer stratum gives rise to the corneal corpuscles, which are the only constituents of the cornea not yet developed.
The epidermic layer gives rise to the corneal lenses, the crystalline cones, and the pigment around the latter.
The corneal corpuscles, which have grown in from the sides, thus form a layer which becomes continually thicker, and gives rise to the main substance of the cornea.
Vision defective, but how much so was impossible to estimate on account of corneal ulcer and general gonorrheal ophthalmia.
There is also said[143] to be some difficulty in distinguishing it from a form of non-syphilitic relapsing cyclitis with corneal opacities and iritis.
They belong to the tribe Myopsida, characterized by the complete closure of the external corneal covering of the eye outside the iris and the lens.
The Oigopsida, or cuttle-fishes in which the corneal covering of the eye is perforated, are on the whole more oceanic than littoral, and many of the species are abyssal.
As the edge of the insertion is now exposed we can see how the land lies, and can carry the threads exactly in the direction of the muscle under the conjunctiva to the corneal margin, where they are passed through, and ends tied in a knot.
There is a congenital dermoid growth of the size of half a pea situated on the inner lower corneal margin.
It is designed to ascertain variations in corneal curvature for the correction of corneal astigmatism.
The healing of a corneal ulcer is characterized by the disappearance of pain where this has been a symptom and by the rounding off of its sharp margins as epithelium spreads over them from the surrounding healthy parts.
The former is usually more superficial and uncomplicated, the latter deeper and complicated withcorneal infiltration, irido-cyclitis and anterior choroiditis.
The treatment with weak solutions of sub-acetate of lead during the acute stage, provided there be no corneal complication, and subsequently with a weak solution of tannic acid, may be recommended.
It is less amenable to treatment and also apt to be complicated by corneal ulceration.
Often an eye bears permanent traces of a perforation in adhesion of the iris to the back of a corneal scar or in changes in the lens capsule (capsular cataract).
The balance of intra-ocular pressure is not maintained by the slight distensibility of the sclero-corneal coat.
Moreover, since the sclero-corneal incision is uniformly oblique, the position and extent of the external wound does not always furnish evidence of the character of the internal wound.
Third: The Elliot sclero-corneal trephining operation carefully performed in accordance with the author's technique in the light of our present knowledge seems to be the best and safest operation to produce that result.
When, however, a true adhesion between corneal and iridic tissue takes place the filtration angle is not so easily opened.
In pursuance of our purpose to avoid uveal tissue, we split the cornea, and place the trephine as far forward as such splitting will allow, and we bear on the trephine in such a way that it cuts through on the corneal edge of the wound first.
It is very difficult for one of limited experience to discuss a subject presented so ably by Lieutenant Colonel Elliot to whom we are indebted for the sclero-corneal trephine operation.
Some cloudiness may be seen in the corneal lamellae adjacent to these fissures, in some cases due evidently to the filtration of aqueous humor through defective endothelium.
Fischer has shown, that when the enucleated eyeball is placed in a weak solution of hydrochloric acid, the swelling of the tissue colloids is sufficient in a few hours, to burst the sclero-corneal coat.
Jackson virtually puts aside the volumetric theory with his statement, that "the balance of intra-ocular pressure is not maintained by the slight distensibility of the sclero-corneal coat.
A broad cutting needle should then be introduced at the lower or outer edge of the corneal margin.
In cases of corneal ulcer, the result either of injury or disease, where there is much pain in the bone, and evidence of tension of the globe, it gives great relief, and when repeated at short intervals greatly hastens a cure.
Both scorpions and spiders possess many eyes, of which two are {76}always separate and median in position, while the others form lateral groups; all these eyes possess a simple retina and a simple corneal lens.
In all the arachnid eyes, whether median or lateral, the lens is a single corneal lens composed of the external cuticle, which is thickened over the corneagen cells.
The Act does not go into questions of corneal reflex, and unconscious muscular movements, and all the undefinable shades between incomplete anaesthesia and complete anaesthesia and profound anaesthesia.
The corneal reflex may be abolished, and still the patient may move.
The puncture may be made at any part of the corneal circumference; it soon heals, and leaves no scar.
The pearly speck which remains after cicatrisation of a corneal sore is termed Leucoma, and is permanent.
A sharp-pointed bistoury is passed through the swollen membrane, and radiating incisions practised, commencing at the corneal margins, and directing them towards the circumference of the globe.
It is necessary on account of central opacity of the cornea—leucoma with entanglement of the iris—and entire closure of the pupil, or diminution of it, with concealment of the remainder by corneal opacity.
The wound gradually contracts; and though an opaque cicatrix must form on the corneal surface, the speck is of much less dimensions than the space formerly occupied by the pterygium.
In no instance and at no time during any experiment was the anaesthesia otherwise than profound; the corneal reflex was never to be obtained, nor was any other sign of sensibility to pain ever to be noted.
Until the corneal reflex is abolished, the surgeon does not begin to operate, for sensibility remains.
The conjunctiva was intensely congested, and there were lachrymation and very marked photophobia, but there were no signs of iritis, and no corneal clouding.
It is more likely that a difference of action is not so much to be sought for in a different parasite as in the peculiarity of the corneal tissue.
Eberth and Wadsworth[86] have shown that the regeneration ofcorneal epithelium takes place from pre-existing epithelium.
Each ommatidium is an elongated cone with its broad extremity abutting against the corneal lenticle.
From the distal ends of the cells are secreted chitinous rhabdomeres, forming a rhabdom which occupies and fills up the central portion of the cup beneath the middle of the corneal lens.
In Scolopendra, where there are four, the corneal lens is a biconvex thickening of the cuticle.
USES: Diagnosis of corneal lesions and impervious strictures of nasal duct.
Separate the lips of the corneal wound with a flexible silver spatula; seize the solid inoculum in a pair of iris forceps, introduce it through the corneal wound, and deposit it on the anterior surface of the iris; withdraw the forceps.
I think this is quite as dangerous as when the anæsthesia is pushed until the patient is relaxed, with the corneal reflex just abolished, and the swallowing and coughing reflexes still present.
It usually affects the lower corneal margin and may be merely roughening and opacity of the epithelium or deep septic ulceration.
The body and neck should be very carefully separated right up to the corneal margin by means of forceps and scissors.
Corneal abrasions by the clumsy insertion of retractors may lead to severe corneal ulceration.
Partial union is effected in cases of paralysis of the first division of the fifth nerve when corneal ulceration threatens.
The flap of corneal tissue thus made is seized with the straight iris forceps and removed with iris scissors, producing a small elliptical opening.
It is then divided as close to thecorneal wound as possible.
This movement is made wholly in a line with the long axis of the knife, the shank passing to and fro through the corneal puncture, loss of the aqueous being avoided in the manipulation (Fig.
When the corneal flap has been made, the knife should lie beneath the conjunctiva, from which a flap about 3 or 4 millimetres in length should be formed.
The knife is next made to cut upwards by a sawing movement so that a flap is formed of corneal tissue about 3 millimetres in breadth (a breadth and a half of a new Graefe’s knife), the upper margin being at the corneo-sclerotic junction.
To evacuate the anterior chamber in bad corneal ulceration, especially when associated with hypopyon and tension.
He finds that the focus of a corneal lens is about 3mm.
Grenacher has since ascertained that the crystalline cones of Flies are so fluid that they can hardly be removed, and he believes that Gottsche’s images were formed by the corneal facets alone.
It is not certain that the cones really assist in the production of the image, which may be due to the corneal facets alone, though modified by the decolorised cones.
In the first place we may find corneal opacities and adhesive iritis.
Eye test:” after death there is a loss of sensibility of the eye to light, loss of corneal transparency, and the pupil is not responsive to mydriatics.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "corneal" in a variety of sentences. We hope that you will now be able to make sentences using this word.
