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Biomedical subjects

P Rusek

Publications and source records attributed to P Rusek.

4 recordsLinked to original sources
PubMed2001

Diffraction by a microrelief grating.

A model is proposed that describes diffraction by a microrelief grating. A microrelief grating is a grating of large period with grooves containing a periodic microrelief with a period considerably smaller than the period of the grating. In the model the interaction of the incident wave with the fine structure is taken into account rigorously while features of the grating that are large compared with the wavelength are modeled as phase or amplitude objects.

Journal Article↗
PubMed2000

[Assessment of the retinal blood flow by DRG retina Doppler in primary open angle glaucoma and normal tension glaucoma].

PURPOSE: The aim of the study was to evaluate the blood flow in central retinal artery (CRA) in primary open angle glaucoma (POAG) and normal tension glaucoma (NTG). MATERIAL AND METHODS: Two groups of patients were examined: I group consisted of 15 patients (19 eyes) with POAG, II group of 16 patients (32 eyes) with NTG. The controls were age-matched healthy persons. Blood flow velocities and resistance index in central retinal artery were measured by DRG Retina-Doppler. RESULTS: We found decreased blood flow velocity in CRA in most of the patients with NTG and in part of the patients with POAG. Significant increase of resistance index was found only in NTG group. CONCLUSION: Our study confirmed that assessment of the blood flow in central retinal artery appears to be a valuable method in diagnosis of neuropathy mechanism in glaucoma.

Female↗
PubMed2000

[Use of a diode laser for glaucoma in children and adolescents].

OBJECTIVE: To present the results of the use of diode laser in the treatment of secondary glaucoma in children. MATERIAL AND METHODS: The study was performed on 15 eyes in 14 children (7 males and 7 females) with glaucoma resistant to pharmacotherapy. Transscleral contact cyclophotocoagulation (TSCPC) was performed using SLx diode laser (Iris Medical Instrument). The number of photocoagulations performed within the circumference of 270 degrees ranged from 18 to 30 and the energy depended on "pop sound". RESULTS: In one child visual acuity decreased from 0.5/50 to light perception, while in the remaining children it did not change. Prior to coagulation, the mean intraocular pressure was 37.67 +/- 3.2 mm Hg, and 6 months after coagulation it was 22 +/- 3.74 mm Hg. CONCLUSIONS: TSPC is a well tolerated method of treatment in children with pharmacotherapy-resistant glaucoma. In order to assess the late outcomes of the therapy, prolonged observation of the patients is required.

Adolescent↗