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Biomedical subjects

V Oguz

Publications and source records attributed to V Oguz.

18 recordsLinked to original sources
PubMed2003

[Results of inferior oblique muscle surgery in superior oblique paralysis].

The aim of this study was to evaluate the results of inferior oblique muscle recession in certain cases of superior oblique paralysis. Twenty-three patients with moderate hyperaction of the inferior oblique muscle, secondary to paralysis of the superior oblique muscle, in whom a recession of the ipsilateral inferior oblique was applied were enrolled in this study. These cases were selected among those with congenital superior oblique paralysis and infantile nontraumatic paralysis and those of unknown origin. Isolated recession of the inferior oblique muscle achieved a mean decrease in 8.69 +/- 2.05 D in hypertropia in the primary position. In 19 cases out of 23 (82.6%) who received isolated recession of the inferior oblique muscle, a vertical deviation equal to or less than 4 PD was obtained, showing the efficacy of this method in the surgical treatment of the cases with superior oblique paralysis and a moderate inferior oblique hyperaction.

Adolescent↗
PubMed1999

[Results of suture fixation in esotropia with non-accommodative far-near uncomitance].

PURPOSE: In esotropia, the dynamic component is the unique objective of suture fixation. The aim of this study was to assess outcome after the suture fixation used with or without other conventional methods and to determine the value of the anesthesia sign for evaluating the innervational factor of these esotropias. METHODS: Unilateral and bilateral posterior fixation sutures were applied in 54 cases exhibiting far-near incomitance between 10-20. The same procedure was applied in 14 cases with similar type of esotropia with incomitance greater than 20. RESULTS: A 100% success rate was achieved when suture fixation was used alone. When suture fixation was applied in combination with other conventional methods for cases with a static and a dynamic component the success rate was 86% (37/43 cases) in unilateral myopexy and 92% (12/13 cases) in bilateral myopexy. DISCUSSION: In cases with this type of esotropia, suture fixation, the only means of correcting a dynamic angle, gives good results as the component disclosing the apparent angle is well-documented. In addition, these findings emphasize the value of the general anesthesia sign to determine the innervational factor causing the dynamic angle.

Accommodation, Ocular↗
PubMed1989

[Foveal displacement after weakening of the inferior muscle. Study using retinophotography].

Among oculomotor disturbances, the cyclotorsions are difficult to quantify. The most accurate and objective method seems to be the retinophotography, which give the measure of the displacement of the fovea relative to the horizontal line lying through the papillary center. The authors have compared this measure over 16 eyes, before and after inferior oblique weakening. A reduction of the cyclotorsion is established in all cases. However, no correlation has been noted between this result and the pre-surgical state.

Adolescent↗
PubMed1989

[Value of angiography in the surveillance of choroid melanoma treated by cobalt disk].

Conservative management of choroidal melanoma by radioactive plaques or protonbeam is widely used since 1968. The treatment of these tumors at Curie Institute has been done with cobalt plaques since 1968. Indications were first monophthalmic patients but are now much wide. We have been treating since 1981 all patients with tumor diameter less than 17 mm and tumor height less than 12 mm. The technic includes general anesthesia to place the disc with localisation of the tumor by transillumination or by indirect ophthalmoscopy. A dose of 70 to 90 grays is delivered to the apex of the tumor. We report two cases of patients treated by cobalt 60 plaque for choroïdal melanoma. The first patient has a 5 mm high choroïdal melanoma temporal to the macula. After treatment by cobalt plaque, he showed no echographic changes but angiograms revealed an hypofluorescent zone in the central part of the tumor. The second patient has an 8 mm tumor that after plaque showed only angiographic changes. Evolution after treatment of choroïdal melanoma by radioactive plaque is variable. Echographic changes are very low and it is frequent to observe no modification in the height of the tumor for a long time for this reason, repeated angiograms can be very useful in the follow up of these patients. They frequently show hypofluorescent spot in the central part of a tumor that was hyperfluorescent before treatment. Sometimes there is diffuse lowering of the fluorescence. We think that these modifications of fluorescence can be due to diminution of the vascularisation of the tumor or may be to central necrosis of the tumor.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMedDate not supplied

The effects of experimentally induced anisometropia on stereopsis.

PURPOSE: To determine the effects of experimentally induced anisometropia on stereopsis in healthy adults to assess the potentially detrimental effects of uncorrected anisometropia on the development of stereoacuity during childhood. METHODS: Twenty-one healthy adult volunteers ranging in age from 22-34 years (mean: 27 years) and free of ocular disease participated in the study. Four different types of anisometropia (unilateral myopia, unilateral hyperopia, or unilateral astigmatism [90 degrees or 45 degrees]) were induced in random order by placing trial lenses over the right eye in 1 diopter (D) increments ranging from 1-3 D. Stereoacuity was measured using the Titmus stereotest with patients placing the cross-polarizing stereoacuity glasses over their lenses or trial frames. RESULTS: Stereoacuity levels were reduced in proportion to the degree of anisometropia in all patients. One diopter of spherical anisometropia reduced stereoacuity to an average 57-59 arc seconds; 1 D of cylindrical anisometropia reduced stereoacuity to an average 51-56 arc seconds. Three diopters of anisometropia, regardless of type, produced a marked reduction of stereoacuity in all patients. CONCLUSIONS: Low levels of anisometropia, both spherical and astigmatic, can have potentially significant adverse effects on high-grade binocular interaction in adults. Foveal suppression, which is directly related to the degree of anisometropia, may be responsible for the loss of stereopsis. The data suggest the effects of anisometropia on stereopsis should be considered in the empiric correction of anisometropic refractive errors in children.

Adult↗