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Biomedical subjects

J Hycl

Publications and source records attributed to J Hycl.

18 recordsLinked to original sources
PubMed2003

[Primary pars plana vitrectomy in the treatment of penetrating eye injuries involving intraocular foreign bodies in the vitreous body ].

The method of choice in the treatment of penetrating eye injuries affecting the vitreous body with an intraocular foreign body is in the majority of patients primary pars plana vitrectomy with transvitreal extraction of the foreign body (FB). During the period from April 1999 till September 2000 the authors treated thus at the Ophthalmological Clinic of the General Faculty Hospital and 1st Medical Faculty Charles University Prague 26 eyes of 26 young men with an average age of 34 years. The mean interval between the injury and primary PPV was 8.5 days. The patients were followed up on average for 23.5 months. The entrance of the penetrating injury was in 17 eyes in the cornea or limbus, in 9 eyes in the sclera. In two eyes posttraumatic endophthalmitis developed. The intraocular FB was 6 mm2 in size in 16 eyes and 6-20 mm2 in 10 eyes. In primary PPV we indicated in 14 eyes internal tamponade with gas or silicone oil. On account of late retinal complications which developed as a result of proliferative vitreoretinopathy we indicated in eight eyes PPV reoperation. At the end of the investigation period in 3 eyes inoperable detachment of the retina developed. As the main negative prognostic factor for final visual acuity the authors evaluated a size of the FB greater than 6 mm2, other negative prognostic factors are the scleral entrance injury, complications of the entrance injury (prolapse of the iris, vitreous body, haemophthalmus) and the development of posttraumatic exogenous endophthalmitis.

Adult↗
PubMed2003

[Experimental correction of irregular astigmatism in patients with keratoconus using diode laser thermal keratoplasty].

OBJECTIVE: To evaluate the potential of diode laser thermokeratoplasty (DTK) in the correction of irregular astigmatism in patients with keratoconus. GROUP AND METHODS: The coagulation of deep layers of cornea stroma was made on four eyes of four patients suffering from advanced keratoconus at the mean age of 31 years by means of the infrared contact cw laser Prolaser Rodenstock 1.9 DTK. The aim of the treatment was to increase the curvature of cornea in flat meridians and to compensate flattening of cornea in steep meridians by way of forming traction strips between the contracted tissue of individual coagulation points. The changes on the cornea topography and changes of visual functions were determined. RESULTS: The diode laser keratoplasty is capable to induce sector increase of cornea curvature and thereby improve symmetry pictures of irregular astigmatism in keratoconus. For a definitive inclusion of DLK into the spectrum of clinically applicable procedures, other therapeutic studies are needed as well as larger groups with relatively homogeneous pre-operation pictures.

Adult↗
PubMed2000

[The retinal nerve fiber layer in glaucoma. II. The status of the nerve fiber layer and development of changes in the visual field. Prospective study].

PURPOSE: To determine whether retinal nerve fiber layer (RNFL) photographs can predict future glaucoma visual field damage. METHODS: In a prospective study 158 red free photographs of the RNFL were made from November 1994 to June 1995. 28 eyes of 19 patients with ocular hypertension (repeated intraocular pressure over 21 mmHg and normal visual fields--Peristat 433 Rodenstock--at first examination) could be re-examined for an average time of 42.3 (SD 4.5) months. RESULTS: Only in one eye with normal RNFL at the first examination typical glaucoma visual field defects appeared (6%), but in 6 of 12 eyes (50%) with photographically demonstrable RNFL defects. The difference was statistically significant. CONCLUSION: There is only a minor probability, that visual field defects would appear during 3-5 years in eyes with normal RNFL photographs (6%), but about 50% of eyes with originally found RNFL defects.

Adult↗
PubMed1998

[Biometry of very short ocular bulbs].

The authors evaluate the postoperative refractive results of 53 patients with extremely short eyes (16.0-20.0 mm) after IOL implantation. As the SRK II formula underestimates the A-constant increase for very short eyes, the authors as a results of the analysis of the set of patients recommend the A-constant recalculation according to formula: A-constant increase = 0.429 x axl x axl - 18.732 x axl + 206.114 and then the calculation of emmetropizing IOL by SRK formula.

Eye↗
PubMed1996

[The retinal nerve fiber network layer in glaucoma. I. Introduction and methods].

In the retinal nerve fiber layer diffuse and localized defects can be seen in glaucoma. Photographs made with a green filter on black and white high contrast film allow to follow these alterations. This method will be used together with colour photographs for the statement of intra- and interobserver agreement.

Fluorescein Angiography↗
PubMed1996

[Ambulatory cataract surgery].

The authors present an account of the experience with the first one hundred out patient cataract surgery which were performed at the Second ophthalmological Clinic in 1993 and 1994. They found that the only absolute contraindication is the need to administer general anaesthesia and they discuss the main problems which ensue from the present state of the health services and society as a whole.

Ambulatory Surgical Procedures↗
PubMed1996

[Phacoemulsification in high myopia].

In 39 eyes of 26 patients with a baseline refraction of -6 to -28 dioptres phacoemulsification with implantation of an intraocular lens was performed. During the 3-23-month follow-up period there was no case of detachment of the retina no development of clinically significant secondary cataract. The resulting refraction of the eyes was +1 to -6 from the intended refraction. In none of the patients deterioration of visually acuity was recorded.

Adult↗
PubMed1994

[Does vascularization and the graft diameter affect the rejection reaction in corneal transplantation?].

The rejection (RR) is one of the most serious complications of perforating keratoplasty (PK). The authors evaluated in a retrospective investigation 316 PK made between 1986 and 1990 at the Second Ophthalmological Clinic in Prague. The authors investigated the number, onset, type of RR and its relation to the character of vascularization and size of the graft. The total number of RR was 66 (20.9%) with a mean onset period of 6.67 months. A significantly higher incidence (p < 0.01) of RR was found in the group of vascularized corneas (28.0%), as compared with corneas without vascularization (14.71%). The difference between groups with a superficial and deep vascularization was not significant. The authors did not find a significant difference in the incidence of RR in PK with a 7 mm diameter of the explant or smaller, as compared with explants larger than 7 mm.

Cornea↗
PubMed1993

[Implantation of bifocal intraocular lenses. Initial experience].

Twelve patients with bifocal intraocular lenses (3M, Suncoast and IOLAB) were evaluated. In 4 patients authors were not able to evaluate bifocality because of macular disorders and optic atrophy. In all remaining 8 patients the bifocality was strongly expressed. The main problem is a postoperative ammetropia. Implantation of bifocal lenses is connected with side effects which are not usually seen in implantations of monofocal intraocular lenses.

Adolescent↗
PubMed1990

[Secondary implantation of intraocular lenses].

In 17 eyes of 16 patients a secondary lens implantation was performed. In 10 eyes with intact posterior lens capsule a retropupillar (PC) lens was implanted, in the other 7 a AC lens. The VA was always good, in two eyes a secondary glaucoma was found, in one it was transient, in the other a LTP was performed. In one eye a decentration for posterior synechiae arose.

Adult↗