Biomedical subjects
M Massin
Publications and source records attributed to M Massin.
[How to remove a nonmagnetic intraocular foreign body para plana?].
After several unhappy experiences, the author thinks that the conditions for a successful extraction of an intraocular foreign body are: a clear lens and a clear vitreous, a proper microscope with the slitlamp beam in the axis of the observation, a three-mirror contact lens in order to have a good view of the periphery, early surgery to avoid adherences and neovascularization, special forceps to grasp the foreign body, a good hemostasis and a subtotal removal of the vitreous. Failures are reported and their causes discussed.
[Results of a double-blind medium-term study comparing effects of timolol maleate and epinephrine in 120 patients with chronic open-angle glaucoma].
A double-blind medium term study of the activity of timolol in chronic open-angle glaucoma was conducted in four French ophthalmological centers, using the same protocol. A total of 119 patients were treated: --60 with timolol; --59 with épinéphrine, for comparison. Results showed a significantly superior efficacy for timolol over épinéphrine, after in weeks of treatment. Good tonometric control was obtained in 81.6% of the patients treated with timolol, against 52.5% of those receiving épinéphrine. In 68% of the glaucomatons patients treated with timolol, good tonometric control was obtained with the lowest dose preparation containing 0.1%. No side-effects were noted during the study, either locally or generally (particularly blood pressure changes).
[A single dose of maleate of timolol given orally: the effect on the ocular pressure (author's transl)].
A single dose of 5 mg of maleate of timolol given orally to glaucomatous patients, considerably lowers their I.O.P. during a period of time of at least 6 hours. It causes only a slight decrease in blood pressure and pulse rate.
[Problems and cause of failure of stripping].
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[Hypopyon ulcer in patient wearing scleral lenses].
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[Dacryocystorhinostomy using a mold].
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[Treatment of corneal perforations other than recent perforating wounds].
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[The glaucoma of short-sighted young people (author's transl)].
About 20 patients chosen at random, and counting 40 over 6 diop. myopic eyes, had their ocular pressure systematically checked. The results were compared with the ocular pressure of 40 non myopic eyes, matched one by one. All the myopic eyes went through a tonography, a gonioscopy and their visual fields were checked through the Friedmann's central field analyser. When no glaucoma was found among the non myopic eyes, 25% of myopic eyes were affected by a significantly high ocular pressure, gonioscopic and perimetric changes. The familial investigations only showed few glaucomatous antecedents. The treatment is debated.
[Biometry of the malignant glaucoma (author's transl)].
The survey of a population of 7 patients with malignant glaucoma, whose 3 were bilateral, showed that the total length of these eyes was weaker, the corneal radius shorter, the anterior chamber more shallow and the insertion of the lens more anterior than that of eyeballs with angle-closure glaucoma on the whole. These latter, we must remind, are already smaller than normal eyes. But this lessening of size does not affect the corneal diameter which remains always normal. And the lens, which is greater than normally in the angle-closure glaucoma, in the contrary is normal or smaller in the malignant glaucoma. The authors think that this little size of the lens allows it to be dislocated anteriorly through the limbal ring after the operation, and so is the cause of the post-surgical malignant glaucoma.
[Role of retinopathy in diabetic microangiopathy].
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[Complications of surgery for closed-angle glaucoma].
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[Possibilities and limits of echographic examination of retinal detachment before and after surgery].
Ultrasonography can provide priceless information about a retinal detachment when the fundus is invisible because of a cataract or an unclear vitreous. The exploration of an eye with A-scan ultrasonography is a long and careful procedure which is made step by step along the meridians, then along the parallels of the eyeball. Quantitative ultrasonography is necessary to separate the echoes of the vitreous opacities and of the detached retina. The B-scan gives the same information - except the biometric data - in a much shorter time and is now available without the interposition of water between the patient and the probe. It also permits an easy diagnosis of the choroidal detachment. After the operation, when the media are not clear, A-and B-scan ultrasonography can give an early indication of whether the retina is reattached or not. But at that time a mistake may be made due to the edge of buckling and everyone should be aware of this.
[Indications, technics and results of cataract surgery on an eye effected with healed or present retinal detachment or predisposed to detachment].
This communication is a survey of 53 cataract operations followed up during a period of 1-6 years, with an average of 4 years, and performed on patients who had a high risk of subsequent retinal detachment because of a preceding detachment on the fellow eye or on the cataractous eye, because of peripheral retinal degenerations, or a history of hereditary retinal detachment. Most of the operations were performed under general anesthesia and ocular hypotony. In all the cases, a limbal-based conjonctival flap with a double line of sutures (scleral and conjonctival), an iridectomy in segment, a zonulolysis and a cryoextraction, were done. As for the retina, 18 eyes received a coagulation before the cataract extraction by galvano- or cryocoagulation or even by xenon photocoagulation. Among them 3 had a detachment after the cataract extraction, but 2 of them were cured by a new operation. 15 eyes had peripheral retinal lesions which were coagulated after the cataract extraction by cryo-, laser or xenon coagulation. Nevertheless 2 had a detachment. 13 patients with a detachment on the fellow eye or in the family, had no peripheral lesion and were not coagulated. None of them had a retinal detachment after the cataract extraction. Finally the eyes operated upon a short time after the cataract extraction suffered severe complications: reopening of the cataract incision, loss of vitreous and finally loss of 2 eyes out of 3.
[Experimental study on the reflection of ultrasonic waves from plane and spherical surfaces with a linear and logarithmic application to ocular biometry].
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[Strabismus in Basedow's disease].
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[Keratoconus and contact lenses (author's transl)].
This work is a survey of 82 cases of keratoconus which have been followed up for 1 to 12 years. Among them only 66 were fitted with contact lenses. The contra-indications for them are: 1. a better visual acuity with spectacles than with contact lenses, 2. advanced cases (4th degree of Amsler) whose fitting is impossible, 3. unilateral keratoconus, 4. associated diseases such as trachomatous pannus, allergic kerato-conjunctivitis. Hard corneal lenses are now in use in most of the cases. Scleral lenses are much less used than they were 10 years ago, owing probably to the great improvement of the corneal lenses during this time. These hard corneal lenses have a short Ro (4 to 7 mm), an overall diameter between 8 and 11 mm, and an optic diameter of 5 mm. They are fitted under fluorescein control. The mobility must be good too. One case was fitted with soft lenses. The visual acuity is good and so is the tolerance: 80% of the patients wear their lenses 10 hours a day or more. Contact lenses do not affect the progression of keratoconus thus finally a keratoplasty must be performed in many cases. After the operation a contact lens is very often necessary, but its daily wearing time must be divided by two, to avoid corneal neo-vascularisation. Soft corneal lenses may be used in some cases of keratoconus. They are indicated when the hard lenses are no longer tolerated and before a keratoplasty. The base curves of these soft lenses are not related to the radii of the conic cornea. In most of the cases they are between 7.50 and 8.60 mm. The diameter is large: 14 or 15 mm. The lenses must not move too much: 1 mm up or down when the patient blinks. The edge of the lens must not depress the bulbar conjunctiva and there must be no air bubble under the lens. In many cases a cylindrical spectacle lens is necessary to obtain a good visual acuity. Some authors prefer to fit a hard corneal lens over the soft one: this is the "piggy back" method. Sometimes keratoconus has appeared in patients already fitted during several years to correct a myopic astigmatism. It is not clear whether these keratoconus have been produced or not be the contact lenses.
[Comparison of axial and para-axial lengths of the myopic eye].
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