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Biomedical subjects

J Korynta

Publications and source records attributed to J Korynta.

33 records · Page 2Linked to original sources

[The first stage of clinical trials of hydrogel lenses manufactured in Czechoslovakia].

The authors give an account of the results of the first stage of clinical trials of Czechoslovak disc-shaped hydrogel lenses made from the copolymer HEMA and methacrylic acid. Hitherto assembled experience provided evidence that the envelope technique for opening of the anterior capsule does not ensure sufficient stability of these lenses in the later stage and their decentration may cause serious complications. Therefore the optimal solution is to place the implant in the capsule after circular capsulorhexy. Improvement of the geometrical and optic properties of the lenses during the subsequent follow-up and their perfect harmony with the surgical technique will produce even better functional results in operated patients.

Aged↗

[Significance of immunologic reactions on the surface of intraocular lenses].

The authors summarize their experience assembled during specular examinations of immunological processes on the surface of the intraocular lens. They describe the incidence of significant components of the immunological reaction--of "large cells", "fibroblast-like cells", round elements, fibrous and acellular membranes on the surface of the intraocular lens. The "large cells" are considered the most important components of the reaction from the clinical aspects. Their incidence depends most frequently on a change in the position of the intraocular lens and non-adherence to therapy in the early postoperative stage. The authors present findings assembled in patients with late changes of the position and formation of synechiae and subluxation, most probably traumatic, and occur in patients who did not respect local corticoid treatment in the early postoperative period. A similar character of the specular finding indicates uniformity of the non-specific reaction which is potentiated by interference with the haemotoocular barrier for various reasons.

Female↗

[Accuracy of intraocular pressure measurement using a noncontact Keeler tonometer].

Using a contactless tonometer of Keeler Co. the authors assessed the intraocular pressure in enucleated eyeballs and compared the values with the intraocular pressure assessed in the eyeballs by means of a water manometer. In the second stage the scatter of assessed values in the eyeballs was compared with the scatter of values obtained by measurements in patients.

Humans↗

[Biocompatibility of retropupillary intraocular lenses].

The authors give an account on the incidence of two types of reactions in the early postoperative period (within two weeks) after implantation of retropupilar intraocular lenses. In a group of 320 patients they observed them in 51 (16%) incl. 17 diabetics. In the group of diabetic patients the incidence of reactions was twice as frequent. A typical fibrin reaction starting on the third day after operation was recorded in 18 patients (5%), in the remaining 33 patients (11%) there was increased opalescence of the aqueous humour, and exudation of cels and cellular structures to the lens surface was associated with the surgical trauma, in particular in beginner implantologists. The two mentioned types of reactions do not have a substantial influence on the final functional effect.

Biocompatible Materials↗

[Immunologic profile in patients with acute anterior uveitis].

The authors investigated 52 patients (22 men and 30 women) with acute anterior uveitis where they ruled out systemic autoimmune disease, metabolic disease and focal or chronic infection. At the time of the infection the patients had not been treated for several months by any immunosuppressive treatment. The authors investigated in these patients serum concentrations of immunoglobulins G, A and M, the concentration of the C3 component of complement and the concentration of circulating immune complexes. Before the onset of therapy they investigated the response to antigens of the Immunoskin test. They assessed also the ratio of transplantation antigens class I by the microlymphocytotoxic test. They compared furthermore immunological indicators in subjects with a first attack and relapse of the disease and in groups, classified by the severity of the inflammatory symptoms. The authors detected significantly more frequently (p = 0.0005) the incidence of HLA-B27 antigen. Those where it was present were more frequently affected with a severe inflammation, as compared with subjects who did not have this phenotype (p less than 0.04). The relapse of the disease was more frequent in women (p = 0.1). The immunological laboratory findings did not differ in the first attacks and relapses of the disease, differences were, however, found in groups which differed as to the severity of inflammatory symptoms. In these groups the response rate to tests of skin sensitivity differed also. Based on these findings the authors assume that the ratio of immune processes in the development of acute idiopathic anterior uveitis cannot be ruled out.

Acute Disease↗

Changes in refraction induced by change in intraocular lens position.

BACKGROUND: Intraocular lens (IOL) decentration and tilt may affect postoperative refractive errors through spherical aberration of the IOL. METHODS: Through a use of a ray-tracing program and by minimizing algorithm, we calculated theoretical refractive errors for various degrees of IOL decentration and tilt. We compared our results with those obtained by paraxial vergence calculations. RESULTS: IOL decentration and/or tilt shifted postoperative refractive errors toward myopia and astigmatism of oblique origin. For example, a 3-millimeter decentration of an IOL resulted in induction of approximately -2.00 diopters (D) sphere and +0.70 D cylinder. IOL tilt affected refractive errors to a lesser degree. The change in refractive error caused by a combination of IOL decentration and tilt depended on the relationship between the geometrical axes of decentration and tilt. In the case of the least favorable combination of 12 degrees of tilt and 3 mm of decentration, it can reach -7.00 D sphere and +4.00 D cylinder. CONCLUSIONS: IOL decentration and/or tilt increase myopia and astigmatism. They are negligible for small decentrations, but could be sources of substantial postoperative refractive errors if the decentration or tile is large.

Astigmatism↗