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Biomedical subjects

T Böker

Publications and source records attributed to T Böker.

43 records · Page 3Linked to original sources
PubMed1990

Complications of sulcus-supported intraocular lenses with iris sutures, implanted during penetrating keratoplasty after intracapsular cataract extraction.

In a retrospective study, the authors analyzed visual results and postoperative complications in a series of 14 consecutive patients who had undergone penetrating keratoplasty and implantation of a posterior chamber intraocular lens (PC IOL) in the absence of the posterior capsule. Seven patients suffered from aphakic bullous keratopathy and seven from pseudophakic bullous keratopathy. Postoperative follow-up was 7.6 months on the average. Best-corrected postoperative visual acuity was 20/60 or better in four cases and 20/200 or better in eight. Glaucoma was present before surgery in four eyes, which persisted in all cases and developed in four new cases. Results of gonioscopic examination showed the postoperative development of goniosynechiae in four eyes. Pseudophakodonesis of various extent was present in ten eyes. Preoperatively, cystoid macular edema was diagnosed angiographically in one case. It did not improve after surgery and was seen in three additional eyes postoperatively. Causes for postoperative visual acuity lower than 20/200 were cystoid macular edema in three cases, graft rejection in one case, central retinal scar in one case, and optic nerve atrophy in one case. A distortion of the pupil was seen in three eyes in miosis and in four additional eyes in mydriasis. Corneal thickness as well as anterior chamber depth were within normal limits. Fluorophotometric evaluation of the blood-aqueous barrier showed values comparable with those obtained after intracapsular cataract extraction and implantation of an iris-fixated IOL. Despite the relatively good visual results, the high postoperative incidence of cystoid macular edema and/or glaucoma may discourage the use of this technique.

Aged↗
PubMed1990

Comparison of Scheimpflug-photography, specular microscopy and scanning electron microscopy to detect corneal changes in toxicity studies in rats.

With an increasing number of in-vivo methods to examine the eyes of laboratory animals, the rat has become an important animal model in experimental eye research. Specular microscopy is a clinical tool to examine the corneal endothelium in-vivo. To evaluate the versatility of this method for small animal eyes, we studied both corneal endothelial cell-count and corneal thickness in normal rats as well as those with diabetic, naphthalene and UV-B cataract. As a reference scanning electron microscopy (SEM) of the corneal endothelium was performed. For cell-counts the correlation coefficient between both methods was found to be sufficient. The comparison of corneal thickness measurement (SEM-values) with specular microscopy and with Scheimpflugbiometry failed to show a satisfactory correlation. The study proves that specular microscopy is a useful tool to document changes also in the endothelium of the rat-cornea.

Animals↗
PubMed1984

Influence of diazepam on visual pattern-evoked potentials with due regard to nonstationary effects. Methodological problems.

The effects of diazepam on visual-evoked potentials (VEP) have been studied. The general effects - increase in latencies and decrease in amplitudes of the main peaks of the VEP - were differentiated by segmented averaging (as a measure for the possible lack of stationariness of the VEP) and by psychological testing (to study the influence of personality traits on medication effects).

Adult↗
PubMedDate not supplied

Nonsurgical fluoroscopically guided dacryocystoplasty of common canalicular obstructions.

PURPOSE: To assess dacryocystoplasty in the treatment of epiphora due to obstructions of the common canaliculus. METHODS: Twenty patients with severe epiphora due to partial (n = 16) or complete (n = 4) obstruction of the common canaliculus underwent fluoroscopically guided dacryocystoplasty. In all cases of incomplete obstruction balloon dilation was performed. Stent implantation was attempted in cases with complete obstruction. Dacryocystography and clinical follow-up was performed at intervals of 1 week, and 3, 6, 12, and 18 months after the procedure. The mean follow-up was 6 months (range 3-18 months). RESULTS: Balloon dilation was technically successfully performed in all patients with incomplete obstructions (n = 16). In three of four patients with complete obstruction stent implantation was performed successfully. Subsequent to failure of stent implantation in one of these patients balloon dilation was performed instead. The long-term primary patency rate in patients with incomplete obstructions was 88% (n = 14/16). In three of four cases with complete obstruction long-term patency was achieved during follow-up. Severe complications, infections, or punctal splitting were not observed. CONCLUSION: Fluoroscopically guided balloon dacryocystoplasty is a feasible nonsurgical therapy in canalicular obstructions with good clinical results that may be used as an alternative to surgical procedures. In patients with complete obstructions stent placement is possible but further investigations are needed to assess the procedural and long-term results.

Catheterization↗