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Biomedical subjects

J F Risse

Publications and source records attributed to J F Risse.

At least 19 recordsLinked to original sources
PubMed1992

[Measuring visual field loss by automated perimetry in chronic glaucoma stabilized by trabeculectomy].

The progression of field loss was determined by Humphrey Automated threshold perimetry in the short and intermediate term after surgical trabeculectomy for chronic glaucoma: mean indices (MD, PSD et FOV) were studied before and after normalisation of the intraocular pressure. Risk factors such as secondary glaucoma, previous visual field defects and cardiovascular risk factors were significantly correlated to poor or bad progression of field loss: the mean variation of MD = +1.23 dB +/- 2.84 (p < 1.5%), the mean variation of PSD = 0.50 dB +/- 1.37 (p < 6%), but the mean variation of FOV was not significant; so 36% of field defects were improved, 42% were stabilized and 22% were aggravated. When the risk factors were absent, 86% of field losses were stabilised but when cardiovascular factors were present, only 64% were stabilised. These risk factors can also be used to ascertain the prognosis of post-surgical progression of visual field, as already shown in previous reports. Automated threshold perimetry was useful to study the visual field progression with standardized and reliable numerical parameters, allowing statistical computerised management of the patients with glaucoma.

Adolescent↗
PubMed1991

[Trachoma in North Cameroon].

A study was carried out in the North of Cameroon concerning the frequency of trachomatous blindness among 3,326 cases of blindness. A 4.63% frequency was found. The results show a 2 women for one man sex ratio and differences between the studied ethnic groups. The role of hygiene is stressed in order to explain these numbers.

Cameroon↗
PubMed1989

[Calculation of the implant: is it a useless luxury?].

Analysis of the means by which accuracy of intraocular lens power calculation could be improved with theoretical and linear regression formulas. The postoperative refractive errors with the lenses selected by the surgeon were compared with those observed with the emmetropic calculated power lenses and with a standard 20 diopters lens. A consecutive series of 100 eyes with less than 4.50 diopters of pre-operative myopia or hypermyopia, is evaluated. Postoperative refractive errors are out of the range -4; +4 diopters in 6% for standard lens, 4% for actually implanted lens, and 1% for emmetropic power calculated lens.

Algorithms↗
PubMed1989

[Effects of laser chorioretinal photocoagulation].

Laser-chorioretinal interactions depend on: non controllable parameters: spectral transmission, absorption of tissue, scattering of laser, distribution of ocular chromophores, thermal conductivity of tissue. They are important determinant of laser tissue effects. parameters that can be monitored by the physician: size of the spot, pulse duration, laser energy and laser wavelengths. Theoretical predictions of laser-tissue interaction with the choroid and the retinal agree with histological and clinical data. The choice of physical parameters of laser must be done in order to prevent adverse effects as to obtain researched therapeutic goal.

Choroid↗
PubMed1979

[Painful ophthalmoplegia and cavernous sinus syndrome of inflammatory origin (discussion of 2 cases)].

Two patients with unilateral painful ophthalmoplegia are presented, a woman of 26 and a man of 28. In both cases the phlebography of the orbit shows an alteration of the orbital veinous blood flow, specially of the third segment of the superior orbital vein. Another characteristic feature of this syndrom is efficiency of corticotherapy and heparinotherapy, which may suggest an inflammatory and thrombophlebitic origin.

Adrenal Cortex Hormones↗
PubMed1979

[Peripheral retinal lesions in the premature infant].

The periphery of the retina was examined with the use of contact lenses at the age of 5 years in children who were born prematurely and weighed less than 1,500 g at birth. In this retrospective series 65% of the children were found to have lesions similar to the classical findings in retrolental fibroplasia although only to a minor degree. Low oxygen levels with a short duration of the exposure cannot completely prevent these sequalae. This retinopathy which is limited to the periphery, may account for the frequency and severity of myopia in children who were premature. Later in childhood and more rarely retinal detachment or tears may occur which cause severe visual impairment.

Child, Preschool↗
PubMed1979

[Postoperative choroidal detachment and chorioretinal surgery].

Clinical study of postoperative choroidal detachment in about 60 patients. The following parameters have been analyzed: frequency, age of the patient, type of detachment, evolution and surgical technique. The prognosis has been discussed. The question is to know whether choroidal detachment is a minor accident or a major complication. The authors try to give an answer, keeping in mind the different parameters analyzed. A research on therapeutic possibilities has been carried out.

Adult↗
PubMed1978

[Visual future of prematures].

The retinal periphery of 60 premature children now between 5 and 8 years of age and with a weight at birth equal or less than 1,500 g has been investigated. In 20% of these children, pigmentary modifications were noted which were often associated with chorioretinal atrophy. Polymorphic vascular abnormalities were seen in 14% of the cases, i.e. sinuous vessels of irregular caliber or neovascularization. Abnormalities of the vitreous body were also noted in 12% of the patients with glial bags on the periphery and sometimes potentially dangerous tractions folds (4%). All these abnormalities could cause complications such as retinal tear, retinoschisis or retinal detachment. Even if these signs are discrete, they can later on be the source of complications. Refraction studies revealed 30% of myopic children. The most important group had myopias equal or higher than 8 d. The characteristics of the myopia of premature children are its constancy (all premature children are myopic at birth); its importance (it depends on birth weight and on the severity of the retinopathy), and its evolution (the myopia of premature children does not evolve or evolves very slightly).

Birth Weight↗
PubMed1977

[Vitelliform degeneration of the macula and Leber's amaurosis. Discussion on nosology (author's transl)].

A description of vitelliform degeneration of the macula in 6 year-old child, and Leber's amaurosis in his first cousin aged 7. The evolution has been followed and studied for 18 months from the point of view of slit-lamp examination, function and electrophysiology. The intrafamilial association of these two types of hereditary tapeto-retinal degeneration allows a discussion on their respective nosological character in the light of the small amount of literature available.

Blindness↗
PubMed1977

[Biometric modification of the eyeball in chorioretinal surgery by Lincoff's indentation method].

Biometric modifications were observed on eyeballs operated upon using the indentation method of Lincoff. The biometric modification of the anteroposterieur axis of the eye was studied by an opticoechographic method. 30 eyeballs with retinal detachment were operated upon using the Lincoff method with silastic implants. The length of the eyeball is not modified. But the analysis of the results indicates a significant reduction of the depth of the anterior chamber. This is entirely neutralized by a slight augmentation of the axial length of the vitreous body. The orientation of the implant has an influence on the biometric data. If it is a radial one, the anteriorposterior axis is lengthened; when it is parallel to the limbus, there a shortening with a reduction in the depth of the anterior chamber.

Anterior Chamber↗