corneal

Laser in situ keratomileusis flaps were created in 10 human eye-bank eyes using the Hansatome microkeratome system (Bausch & Lomb). These eyes were divided into 2 groups. Flaps in the first assort (n = 4) were secured with a laser-activated biodendrimer adhesive along the flap edge. In the second assort (n = 6) the flaps were secured with a self-gelling dendritic adhesive. Dry Merocel sponges (Medtronic Solan) were used to test the strength of move adherence in both groups. Further testing was performed in the back up group. The hinges of these flaps were cut with a scalpel blade and fluorescein dye was injected under the flap to observe potential dye leakage along the flap edge. Treatment of rabbit corneal wounds with topical corticosteroid retards both epithelial regeneration and healing of penetrating stromal wounds. Currently no clinical agent is available which accelerates the rate of stromal hurt healing. Epidermal growth factor (EGF. 0·5 mg ml ) was significantly increased compared with saline- or dexamethasone-treated corneas (P < 0·001). In the absence of dexamethasone. EGF increased the tensile strength of corneal wounds significantly better than insulin (P < 0·01). However when EGF or insulin were given in combination with dexamethasone there was no significant difference between the tensile strength produced by the peptide hormones. In comparison to the tensile strength of corneal wounds treated by EGF or insulin treatment with FGF alone (5±4 g mm H]-thymidine incorporation approximately 2·5-fold compared to control cultures whereas in combination with dexamethasone (10 n I-EGF to HCF reached maximum after 2 hr at 37°C and was specific saturable and of high affinity (half saturation at 1 n ). These results indicate that EGF alone or in combination with dexamethasone is a potent accelerator of hunt corneal stromal hurt healing in vivo and that EGF directly stimulates DNA synthesis of HCF in vitro presumably through specific high affinity receptors on corneal fibroblasts. EGF alone or in combination with corticosteroids may be useful in promoting healing in patients with corneal lacerations. Ocular trauma and disorders that bring about to corneal blindness account for over 2 million new cases of monocular blindness every year. A popular ocular surface reconstruction therapy amniotic membrane transplantation has been shown to aid corneal wound repair. However the success rates of the procedure are variable. Here we proposed to bioengineer a novel synthetic material that would answer as a biomimetic corneal bandage. The PLGA–PEG–PLGA triblock copolymer was synthesised via ring-opening polymerisation. Thermoreversible gelation behaviour was investigated at different polymer concentrations (23%. 30%. 35%. 40%. 45% w/v) at temperatures ranging between 5 and 60 °C. Viscoelastic properties were studied in dynamic mechanical analysis with 1 °C/min temperature ramp. Cryo-SEM revealed a porous hydrogel with interconnecting networks. No adverse cytotoxicity was observed with an in vitro scratch-wound assay and in in vivo biocompatibility tests. We have demonstrated that the PLGA–PEG–PLGA hydrogel possessed a suitable gelling profile and for the first time the biocompatibility properties for this application as a potential bandage for corneal wound repair. I-labelled EGF in the conjunctival sac of mice and measured the residual radioactivity at different times to evaluate the in vivo compose of EGF channel. Approximately 60–67% and 10–12% of EGF applied initially remained 1 and 7 days after application respectively; whereas EGF delivered in topically applied solution or via EGF impregnation of soft contact lenses disappeared within the first day. We also placed CGH films with 5.0 μg of incorporated EGF on round corneal defects in rabbits to evaluate the healing process using image analysis software and to evaluate epithelial proliferation immunohistochemically by counting the number of Ki67-positive cells. The application of a CGH enter with incorporated EGF resulted in a reduction in the epithelial defect in rabbit corneas accompanied by significantly enhanced epithelial proliferation compared with the reduction seen after the topical application of EGF solution or the placement of an EGF-free CGH film. The controlled release of EGF from a CGH placed over a corneal epithelial defect accelerated ocular surface wound healing. Today corneal wounds are repaired using nylon sutures. Yet there are a number of complications associated with suturing the cornea and thus there is interest in an adhesive to replace or add sutures in the repair of corneal wounds. We are designing and evaluating corneal adhesives prepared from dendrimers—single molecular weight and highly branched polymers. We undergo explored two strategies to form these ocular adhesives. The first involves a photocrosslinking reaction and the back up uses a peptide ligation reaction to couple the individual dendrimers together to create the adhesive. These adhesives were successfully used to repair corneal perforations close the flap produced in a LASIK procedure and secure a corneal transplant. Fig. 2. Divergent synthesis of a generation three dendimer showing the step-wise coupling and deprotection reactions. The monomer consists of three parts—the red portion for coupling to a growing dendrimer a blue administer which has two potential coupling sites which is capped by a go protecting group. After the monomer is coupled the protecting group is removed and the monomer is added again to create the large dendrimer. This process is repeated until a specific dendrimer generation is prepared. Editor's Note: Leading Opinions: This paper is one of a newly instituted series of scientific articles that provide evidence-based scientific opinions on topical and important issues in biomaterials science. They have some features of an invited editorial but are based on scientific facts and some features of a analyse paper without attempting to be comprehensive. These papers have been commissioned by the Editor-in-Chief and reviewed for factual scientific circumscribe by referees. Tel.: +1 617 358 3429; fax: +1 617 358 3186.

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Blood samples were taken from patients immediately after specific surgical endodontic procedures and immediately after single-tooth extractions. The incidence of bacteremias produced by these procedures was determined. The source of the blood-borne micro organisms was confirmed as the operative site. Culture and pathological analysis revealed Candida albicans in all 3 cases. Common links among the cases were early onset of DLK following intensive corticosteroid and antibiotic treatment and later onset of interface fungal infection. All cases resolved and good visual acuity was restored after medical treatment with antifungal agents. We report an unusual case of presumed late-onset unilateral diffuse lamellar keratitis of uncertain etiology in a 23-year-old man who presented with elevated intraocular pressure following uneventful laser in situ keratomileusis (LASIK). After treatment with topical corticosteroid therapy the condition progressed to interface fluid syndrome. Isolated pockets of fluid were clearly demonstrated at the level of the LASIK flap interface on slitlamp biomicroscopy and in Pentacam Scheimpflug images. We report the confocal microscopic findings in a case of interlamellar stromal keratopathy induced by elevated intraocular pressure (IOP) after laser in situ keratomileusis (LASIK). In vivo confocal microscopy showed swollen and enlarged cellular structures and the presence of microlacunae separating the stromal collagen lamellae. Inflammatory mononuclear cells and granulocytes typically seen in patients with diffuse lamellar keratitis (DLK) were absent. Stopping the topical steroids with concurrent lowering of the IOP resulted in improvement in the uncorrected and best corrected visual acuities and was associated with resolution of the corneal findings. In vivo confocal microscopy is a useful tool to study interlamellar stromal keratopathy induced by elevated IOP after LASIK in humans and the response to treatment and to differentiate interlamellar stromal keratopathy from DLK. In all cases of stage 1 and 2 DLK confocal microscopy showed infiltration of inflammatory cells into the flap stroma and the interface. The density of the infiltrates and the number of cells varied within the stage 1 corneas; all stage 2 corneas had dense infiltrates. In the eye with stage 3 DLK an aggregation of presumed cell remnants was noticed. In the stage 4 cases there was no active inflammation but stromal folds and numerous activated keratocytes were detected. In this case series. 200 eyes were evaluated for the corneal interface contamination at the end of LASIK. Cultures were taken from the upper and lower eyelid margins and the inferior fornices before surgery and from the corneal interface and the instrument at the end of surgery. Media were cultured at 37°C for 14 days under aerobic and anaerobic conditions. Bacteria from positive cultures were isolated and identified by biochemical procedures to determine the species of the organisms.

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cause of stromal hydration of clear corneal incisions: Quantifying ingress of trypan blue into the anterior chamber after phacoemulsificationJournal of Cataract & Refractive Surgery, Volume 33. Issue 4, April 2007. Pages 623-627Abhay R. Vasavada. Mamidipudi R. Praveen. Deepak Pandita. Devarshi U. Gajjar. Vaishali A. Vasavada. Viraj A. Vasavada. Shetal M. Raj and Kaid JoharAbstract A prospective randomized study included 80 eyes having phacoemulsification through 2.2 mm incisions. These eyes were divided into 2 equal groups: 1 had stromal hydration (surgery completed by injecting fortified balanced salt solution [BSS Plus] to furnish the lateral walls and internal entry of incision) and the other had no stromal hydration. One half milliliter of 0.0125% sterile trypan blue was instilled on the ocular surface and allowed to be for 2 minutes. One-tenth milliliter of aqueous fluid was aspirated from the anterior domiciliate and its optical density was measured using ultraviolet spectrophotometry. Logs of dilution of trypan blue were used for statistical analysis using the nonparametric Mann-Whitney U test. There was a statistically significant change magnitude and difference between groups in mean dilution of trypan blue in the aqueous aspirate (P<.001). The convey was 1:11 337 in the stromal hydration group and 1:220 in the no stromal hydration group. Logs of convey dilution of trypan color had statistically significant lower values in the stromal hydration assort than in the no stromal hydration group (3.21 and 2.14 respectively) (P<.001). The Zeiss Visante OCT anterior divide imaging system was used to chew over the compose of alter corneal cataract incisions all in senior citizens. The OCT images of the operative eye were taken on the first postoperative day approximately 24 hours after surgery. The OCT images of alter corneal incisions were compared with an OCT visualise of a control eye incisions without stromal hydration and previous drawings of clear corneal incisions. In the images the alter corneal incisions had an arcuate configuration rather than a straight line configuration as previously indicated. This architecture appears to add greater stability as a result of a tongue-and-groove-like fit of the floor to the roof of the incision as well as an incision that is longer than the chord length that had previously been measured. Other findings include that stromal swelling which facilitates sealing of these incisions by the endothelial handle lasted for at least 24 hours. Results tell an incision in the cut of the cornea with a chord length of at least 2.0 mm provides advantageous architecture for adequate self-sealing. Proper alter corneal incision construction resulted in an incision architecture that seemed to undergo increased stability and added safety contributing to an absence of endophthalmitis for more than 10 years and 9000 cases in a single practice.

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A laser welding technique could furnish surgeons an alternative to suturing for closing corneal wounds after phacoemulsification or extracapsular cataract extraction according to a chew over by researchers in Italy. However the laser-assisted technique may affect postoperative astigmatism the study authors noted. Luca Menabuoni. MD and colleagues at Hospital of Misericordia e Dolce. Prato evaluated the efficacy of closing corneal wounds using a diode laser to "conjoin" the stroma after cataract surgery in 20 eyes of 20 patients. Surgeons performed phacoemulsification and ECCE in 10 eyes each. All eyes had a preoperative visual acuity worse than 20/200 according to the study. The researchers found no hurt leakage in any eyes over the cover of follow-up. Additionally patients showed rates of endothelial cell loss similar to rates reported for standard cataract surgical procedures the authors said. Neither collateral effects from the laser welding procedure nor postoperative inflammation were detected. However all eyes object one that underwent ECCE showed minor differences between the pre- and postoperative levels of astigmatism they noted. Despite the astigmatic cause the laser-assisted procedure has "significant potential applications for the end of longer incisions such as those used in penetrating keratoplasty," the authors said.

communicate lens cultures may back up ophthalmologists in identifying the organism involved in cases of microbial keratitis according to a chew over by researchers in Australia. Such cultures may also help in choosing appropriate antimicrobial therapy the authors noted. Sujata Das. MS. FRCS and colleagues investigated the association between 50 culture results from corneal scrapings and contact lenses of 49 patients with contact lens-related microbial keratitis. All patients were treated at Royal Victorian Eye and EarHospital in Melbourne between January 2001 and December 2004 according to the study. Corneal scrapings were grow positive in 17 eyes (34%) and contact lenses were culture positive in 35 eyes (70%) the authors reported. In 13 eyes corneal scrapings and communicate lenses yielded identical organisms. Serratia marcescens was the most common organism isolated from both the corneal scraping and communicate lens cultures they reported.

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MDLinx offers fantastic rewards to our members. Find out how you can act and start reaping the rewards today! acquire rewards for: Referring Friends Taking Polls & Surveys Much more! Obata. H. et al. - Conclusions: The Bowman layer and Descemet membrane seem to answer as barriers to separate 3 cellular layers of epithelium stroma and endothelium. Disruption of the Bowman layer forms a new epithelial-stromal interaction and may cause cellular proliferative response. Separation of Descemet membrane can provide the initiate for emanating stromal create from raw material from the wound advance Pseudoexfoliation (PEX) syndrome is a common ocular disease that also affects the cornea. A case of clinical PEX syndrome studied by in vivo corneal confocal microscopy is Simpson. A. R. H. et al. - Bohring-Opitz syndrome is a rare genetic instruct of uncertain inheritance. It was first delineated by Bohring and coworkers in 19991 and up to 15 possible cases have been reported. It has both ophthalmic and systemic features and represents a unique syndrome considered Khan. A. O. et al. - Ocular osseous choristoma a rare idiopathic benign deposit of hit the books is typically a static epibulbar lesion that occurs sporadically in the supertemporal quadrant of an otherwise normal eye. The subject of this report is a unique U-shaped subcutaneous osseous choristoma that Ozkan. S. B. et al. - Congenital fibrosis of extraocular muscles may rarely show by involvement of isolated extraocular muscles. We report a inspect with an unusual create of congenitally fibrotic superior oblique and Kozobolis. V. P. et al. - Conclusions: Perimetric changes become in carotid stenosis. CEA results in the improvement of retrobulbar blood flow and perimetric parameters. Further research will be required to determine What is an RSS News Feed? You can add the latest news items in your specialty to your preferred online news obtain.

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STOCKHOLM. Sweden — Corneal cross-linking procedures can be performed without epithelium removal according to one ophthalmologist speaking here. Roberto Pinelli. MD described for attendees of the European Society of Cataract and Refractive Surgeons meeting his results in 30 keratoconic patients treated with corneal collagen cross-linking with no removal of the epithelium. After following the patients for 6 months. Dr. Pinelli found the mean uncorrected visual acuity improved by 1.3 lines convey beat corrected visual acuity improved by 1.1 lines and there was a mean increase in central pachymetry of 13 µm according to his results. Furthermore the progression of keratoconus stopped in all 30 eyes and there was a convey change magnitude in MRSE of –1.27 D he told the audience.

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Department of Ophthalmology. China-Japan Union Hospital. Jilin University. Jilin. China. Accepted 9 April 2007.  Available online 30 August 2007. Molecular genetic analysis was performed on the DNA extracted from peripheral leucocytes from a Chinese family with atypical lattice corneal dystrophy. Fifty normal unrelated subjects of Chinese origin were used as controls. All exons of the TGFBI gene were amplified by polymerase chain reaction and directly sequenced. Bilateral symmetrical ridgy go pattern of opacities with uneven surfaces and thin lattice lines were noted in the proband. Analysis of exon 14 revealed a heterozygous T to A transition on codon 625. The mutation was not detected in the unaffected family member and 50 unaffected individuals. The novel TGFBI gene mutation (V625D) is associated with an early-onset variant of lattice corneal dystrophy. This case highlights the utility of molecular genetic analysis in differentiating corneal dystrophies associated with an atypical phenotype from nondystrophic conditions. Inquiries to Zhizhong Ma. Department of Ophthalmology. Third Hospital. Peking University. 49 North Garden Road. Haidian District. Beijing. China. 100083

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350? '350px':'auto'); max-height:60; height:expression(this scrollHeight > 60? '60px':'auto');overflow:hidden;"> Expanded utilization of the EpiOcular™ human corneal tissue model for ocular irritation tests Yulia Kaluzhny. Patrick Hayden. Helena Kandárová MatTek Corporation. Ashland. MA. United States Available online 5 September 2007.

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One method of identifying which organisms are involved in cases of corneal eye infections is to be at the cultures of contact lenses according to an article in Archives of Ophthalmology (JAMA/Archives). September air. The authors of the articles say “Contact lens wear is associated with a significant assay of microbial keratitis [corneal eye infection] leading to severe sight-threatening complications. Microbial keratitis has been seen in all types of lenses including rigid gas-permeable lenses hard or poly-methylmethacrylate lenses and high-and-low-oxygen transmissibility soft lenses as well as with all modes of feature including daily feature extended feature therapeutic wear and continuous feature.” Sujata Das. M. S.. F. R. C. S. of the Center for Eye Research Australia. University of Melbourne and Royal Victorian Eye and Ear Hospital. Melbourne. Australia and colleagues looked at the records of 49 patients who suffered from communicate lens-related microbial keratitis. Their add up age was 34. The study looked at the period January 2001 - December 2004. Their aim was to see what cerebrate there was between cultures of communicate lenses and cultures of corneal scrapings. They factored in such variables as sex symptoms age results and predisposition. Of the 49 patients (98 eyes) there were 50 eyes with microbial keratitis. 34% (17) of corneal scrapings and 70% (35) of the communicate lenses had organisms breeding on them. As far as 13 of the eyes were concerned the organisms that were growing in the cultures taken from the contact lenses and corneal scraping were identical. Only two eyes had different organisms from the communicate lenses. In just two eyes were corneal scrapings open to be grow positive wrote the authors. The writers cerebrate “Our chew over highlights the fact that contact lens culture may back up in identification of the causative organism in many cases of contact lens-related microbial keratitis. Also communicate lens culture may give a clue regarding the identity of the causative organism in situations in which the corneal scraping is culture negative and may back up in choosing the allot antimicrobial agent.” “Association Between Cultures of communicate Lens and Corneal Scraping in Contact Lens-Related Microbial Keratitis” Sujata Das. MS. FRCS(Glasg); Harsha Sheorey. MD. FRCPA; Hugh R. Taylor. AC. MD. FRANZCO; Rasik B. Vajpayee. MS. FRCS(Edin). FRANZCO bend Ophthalmol. 2007;125:1182-1185.

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