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C Peyre

Publications and source records attributed to C Peyre.

9 recordsLinked to original sources
PubMed2005

[Comparison of high-order optical aberrations induced by different multifocal contact lens geometries].

PURPOSE: To analyze the effects of different multifocal soft contact lens geometries on high-order ocular optical aberrations. MATERIALS AND METHODS: Thirty nonpresbyopic eyes were fitted with eight multifocal contact lenses: Soflens Multifocal High, Soflens Multifocal Low, Focus progressive, Acuvue Bifocal Add +2.00, Rythmic Multifocal Profile 1, Rythmic Multifocal Profile 2, Proclear D Add 2.00, Proclear N Add 2.00. All these contact lenses corrected the ametropia for far distance. The ocular aberrations were measured with and without each contact lens using a Hartmann-Shack aberrometer, (Zywave from Bausch and Lomb) successively after pupil dilation with one or two drops of Neo-Synephrine and wavefront decomposition in Zernike polynomials up to the 5th order. RESULTS: Odd and even aberrations increased for all the tested multifocal soft contact lenses. The most significant increase was noted for the a(4.0) Zernike coefficient. The mean value of a(4.0) without contact lens was -0.178+/-0.121 microm. The contact lenses having a central zone for near addition cause the inversion of the sign of the a(40) coefficient The central far vision contact lens leads to the opposite effect, increasing spherical positive aberrations. The most significant increase in total high-order ocular aberrations were noted for Proclear D soft contact lenses (0.396+/-0.109 microm without contact lens, 0.511+/-0.123 microm with contact lens; p<0.05, +29%), for Proclear N soft contact lenses (0.396+/-0.109 microm without contact lens, 0.568+/-0.165 microm with contact lens; p<0.05 +43%) and for Acuvue Bifocal soft contact lens (0.396+/-0.109 microm without contact lens, 0.567+/-0.162 microm with contact lens; p<0.05 +43%). CONCLUSION: Wearing multifocal contact lenses induces an increase in high-order ocular aberrations. The location of the near addition zone is related to the sign of the variation of the a(4.0) coefficient. The central near vision multifocal contact lenses seem to induce large amounts of negative spherical aberrations. The far vision contact lenses seem to induce an increase in positive spherical aberrations. The relative decentration of the lens to the pupil may explain the increase in odd high-order aberrations. These results might be useful to understand the visual complaints of patients fitted with multifocal contact lenses.

Contact Lenses↗
PubMed1984

[A new concept of dressing: silastic foam].

The authors report their experience, still short, of a new type of dressing based upon Silastic foam used in general surgery. They emphasise the considerable progress achieved in the everyday care of their patients with easy to manage dressings and the virtual disappearance of pain. This has transformed the patients' existence and has made early physiotherapy possible in certain of them. The simplicity of use of this dressing leads to savings in time and cost and if the patient is cooperative the possibility of widespread use at home by the patient himself. The properties of this foam form the basis for a wide range of indications going beyond general surgery, with applications in ENT, dermatology, rehabilitation centres, etc. Results are satisfactory in 90% of cases, the only failures being due to a failure to obey the basic principles of care: doubtful indication (inadequate disinfection of wounds), neglect of concomitant pathology (diabetes, nutritional state) or lack of patient cooperation.

Adolescent↗
PubMedDate not supplied

Live-donor liver transplantation: the USC experience.

BACKGROUND: Liver transplantation is currently the standard of care for patients with end stage liver disease. However due to the cadaveric organ shortage, live donor liver transplantation (LDLT), has been recently introduced as a potential solution. We analyzed and support our initial experience with this procedure at USC. MATERIAL AND METHODS: From September 1998 until July 2000, a total of 27 patients underwent LDLT at USC University Hospital and Los Angeles Children's Hospital. There were 12 children with the median age of 10 months (4-114) and 15 adults with the median age of 56 years (35-65). The most common indication for transplantation was biliary atresia for children and hepatitis C for adults. RESULTS: All donors did well postoperatively; the median postoperative stay was five days (5-7) for left lateral segmentectomy and seven days (4-12) for lobar donation. None of the donors required blood transfusion, re-operation or postoperative invasive procedure. However, five of them (18%) experienced minor complications. The survival rate in pediatric patients was 100% and only one graft was lost at nine months due to rejection. Two adult recipients died in the postoperative period, one from graft non-function and one from necrotizing fascitis. 37% of adult recipients experienced postoperative complications, mainly related to biliary reconstruction. Also 26% of the recipients underwent reoperation for some of these complications. CONCLUSION: LDLT is an excellent alternative to cadaveric transplantation with excellent results in the pediatric population. However, in adult patients it still carries a significant complication rate and it should be used with caution.

Adult↗