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Biomedical subjects

S Véronneau-Troutman

Publications and source records attributed to S Véronneau-Troutman.

13 recordsLinked to original sources
PubMed1990

Simultaneous superior oblique sheathectomy and inferior oblique tuck in congenital Brown's syndrome.

Since Harold Brown, in 1950, described the superior oblique tendon sheath syndrome, numerous surgical techniques have been explored to treat this condition. Tenectomy of the homolateral superior oblique, alone or in combination with a weakening procedure on the homolateral inferior oblique, has been the technique most advocated. However, good functional results are rarely achieved in a single procedure, and delayed complications are frequent. Taking advantage of the improved dissection and reduced trauma afforded by the use of a surgical microscope, one of the techniques first recommended and later abandoned by Brown was reappraised. The technique consists of dissection of the sheath and attachments of the superior oblique, while preserving its tendon, combined with a 10mm tuck of the homolateral inferior oblique. Both a typical and a severe atypical congenital case, according to the classification of Brown, were treated in this fashion. Full correction was achieved in both.

Child↗
PubMed1988

A four-step test for diagnosis of pseudo superior oblique palsy.

An 8-year-old boy presented with an ocular torticollis that had appeared many months after a ptosis repair. The three-step test was positive for a superior oblique palsy. However, at the time of surgery the forced duction test showed a marked restriction in depression of the eye. These findings were duplicated before the second procedure normalized the ocular movements. The surgical microscope was of great help for the extensive dissection necessary to correct the condition. The fourth step, the forced duction test, was essential for accurate differential diagnosis between true superior oblique palsy and a mechanical hypertropia.

Child↗
PubMed1986

A new laser for collagen wounding in corneal and strabismus surgery: a preliminary report.

It has been shown that using a small spot size 2 to 5 mu, a dye modified excimer laser emitting at 595 nm can produce laser ablation of tissue in corneal stroma without compromising anterior and posterior limiting membranes. The surface of extraocular muscle tendon sheath has been similarly laser modified. An instrument, under prototype construction, designed for clinical application of this laser energy is described as well as clinical implications of such surgical interventions in corneal and extraocular muscle surgery.

Collagen↗
PubMed1979

A new optical modality to overcome diplopia.

The author has presented a new method to correct vertical diplopia using a prism contact lens. To the present time, its application has been limited to contact lenses correcting refractive errors of less than 3D and to ground-in prisms of not more than 6 delta. The field is new. Technical, mathematical, and clinical advances should eventually allow the use of stronger prisms over a wider range of refractive corrections.

Contact Lenses↗
PubMed1978

Fresnel prisms and their effects on visual acuity and binocularity.

1. The visual acuity with the Fresnel membrane prism is significantly less than that with the conventional prism of the same power for all prism powers from 12 delta through 30 delata at distance and from 15 delta through 30 delta at near. 2. The difference in the visual acuity between base up and base down, and between base in and base out, is not significantly different for either the Fresnel membrane prism or for the conventional prism. 3. For both Fresnel membrane prism and the conventional prism, the visual acuity when looking straight ahead. 4. Using Fresnel membrane prisms of the same power from different lots, the visual acuity varied significantly. The 30 delta prism caused the widest range in visual acuity. 5. When normal subjects are fitted with the higher powers of the Fresnel membrane prism, fusion and stereopsis are disrupted to such an extent that the use of this device to restore or to improve binocular vision in cases with large-angle deviations is seriously questioned. 6. Moreover, the disruption of fusion and stereopsis is abrupt and severe and does not parallel the decrease in visual acuity. The severely reduced ability to maintain fusion may be related to the optical aberrations, which, in turn, may be due to the molding process and the polyvinyl chloride molding material. 7. Through the flexibility of the membrane prism is a definite advantage, because of its proclivity to reduce visual acuity and increase aberrations its prescription for adults often must be limited to only one eye. 8. For the same reasons in the young child with binocular vision problems, the membrane prism presently available should be prescribed over both eyes only in powers less than 20 delta. When the membrane prism is to be used as a partial occluder (over one eye only), any power can be used. 9. The new Fresnel "hard" prism reduces visual acuity minimally and rarely disrupts binocularity, thus increasing the potential for prismotherapy to establish binocularity. This prism is currently available only for use as a trial set. Since the cosmetic appearance of the Fresnel "hard" prism is similar to that of the Fresnel membrane prism and it is easier to maintain, it would be the prism of choice (over all other types) for bilateral prescriptions in the young patient with emmetropia. The manufacturer is urged to make these prisms available to fit a special round adjustable frame, such as that developed in Europe for use with the wafer prism.

Adolescent↗