Search PubMed⌕ Search

Biomedical subjects

P Rol

Publications and source records attributed to P Rol.

29 records · Page 2Linked to original sources
PubMed1989

Integrated optical fiber systems--some theoretical aspects.

The specific advantages of a number of integrated optical systems, consisting of optical probes of various shapes and materials, coupled to a number of optical fibers are described. The radiation fields of the various systems vary significantly in their performance and the clinical effects may be expected to vary correspondingly. This is a step forward in the theoretical evaluation of optimal laser microsurgical tools for specific applications.

Aluminum Oxide↗
PubMed1987

Transscleral iridotomy using a neodymium: YAG laser operated both with standard equipment and an optical fiber system--a preliminary report: Part I--Optical system and biomicroscopic results.

The effects upon the iris of radiation emitted by a Nd:YAG laser working in its thermal (free-running) mode and transmitted through the sclera were studied. The advantages and disadvantages of a fiber optic system, as compared to a conventional optical system, were studied using eight autopsy eyes. It was shown that the conventional optical system as well as a fiber optic system are both able to perforate the iris completely and to blast away or destroy the pigment epithelium. One merit of the fiber optic system as compared to the conventional system is that it requires considerably less energy for the same effect. This is partially because the sclera, when compressed, becomes more transparent and thus transmits a greater amount of laser energy.

Fiber Optic Technology↗
PubMed1986

A new contact lens for posterior vitreous photodisruption.

Effective and safe photodisruption requires that the laser pulse be brought to a fine focus. Contact lenses are generally required to compensate for the optical aberrations of the eye which degrade the laser focus. The theoretical analysis of these aberrations has led to the construction of a contact lens which minimizes aberrations in the posterior vitreous. Clinical applications confirm the increased efficacy and safety of posterior vitreous photodisruption using this contact lens.

Contact Lenses↗
PubMed1986

Aiming accuracy in ophthalmic laser microsurgery.

A number of aiming/focusing systems, oriented toward guiding the treatment beams of photodisruptive, high power Nd:YAG lasers, are analyzed and evaluated. A system, consisting of two frequency modulated, rotating laser beams, which outline the Nd:YAG laser beam shape, is shown to be the optimal solution.

Humans↗
PubMed1986

Transscleral cyclophotocoagulation using a neodymium YAG laser.

The effects of a neodymium: YAG laser, working in the free-running mode (1 and 20 millisecond pulses), upon the ciliary body via the transscleral route have been studied using 16 autopsy eyes. The experiments described were designed to find an efficient strategy of transscleral cyclodestruction of the ciliary body. It was found that pulse energies of between 6 and 7 Joules, an exposure duration of 20 milliseconds, and maximal defocusing are optimal. A beam, tangentially oriented and positioned 1/2 to 1 mm posterior to the limbus has a high probability of hitting the ciliary body and damaging the ciliary processes. In these experiments a first generation of contact lenses could not be demonstrated to have an advantageous effect.

Ciliary Body↗