Biomedical subjects

F Fankhauser

Publications and source records attributed to F Fankhauser.

At least 163 records · Page 9Linked to original sources

PubMed1977

Optical attachment to the O'Malley photocoagulator.

An optical attachment (originally developed for the Zeiss-Oberkochen photocoagulator), which provides slitlamp observation and energy delivery through a fundus contact glass, can also be coupled to the Clinitex Log-2 photocoagulator described by O'Malley. Excellent image quality out to the far periphery is obtained. The system has been successfully used for the prophylactic treatment of retinal detachment in the presence of retinal hole formation, the treatment of various conditions of diabetic retinopathy, localized fluid accumulations occurring after retinal surgery, and irradiation of the iris.

Animals↗

PubMed1977

[Physical and biological effects of laser radiation (author's transl)].

A survey on the present concepts about the physics of laser radiation and its effects upon biological structures is presented. An approach has been chosen which also considers the influence of quantities such as bean geometry, heat conduction and absorption upon the lesions produced. Finally the physical and biological effects of short-pulse, high power density laser pulses are described.

Biophysical Phenomena↗

PubMed1976

[Diabetic retinopathy; facts and speculations].

Our knowledge of the etiology of diabetic retinopathy is very limited. Correlation of the time interval between onset of diabetes and diabetic retinopathy as a function of age makes it possible to estimate the degree of resistance of the small vessels to the microangiopathy-inducing agent for the various age groups. Epidemiologic data reveal that, viewed statistically, malignant diabetic retinopathy is relatively rare, and that the life expectancy of blind diabetics is longer than is commonly assumed.

Aged↗

PubMed1976

Static perimetry: strategies.

In static perimetry the method of limits is widely used for threshold determinations. Its performance is compared with that of a certain modification of the staircase method (repetitive up and down) by means of simulations, where the behaviour of the observer is described by an assumed psychometric function. Systematic and random errors are considerably smaller with the up and down method. Further consideration is given to signal detection theory and to the concept of optimal strategy.

Humans↗

PubMed1976

Static perimetry: accuracy and fluctuations.

Threshold fluctuations are divided into short-term and long-term effects applying statistical methods. Sixteen normal and pathological visual fields were analysed in order to obtain values for the short-term, long-term and total fluctuations. Special attention is paid to fortuitous variations between the results obtained at successive examinations. Finally the concept of spatial correlations is introduced.

Humans↗

PubMed1976

[Advances in the automation of perimetry (author's transl)].

The most important improvements and innovations since 1973 in the automatic perimeter Octopus are described. On the one hand, they include instrumental modifications, namely spatial separation of the perimeter from its control panel, the introduction of step motors in order to increase the accuracy of setting of the stimulus coordinates, the tilting of the perimeter cupola and patient in order to increase stability and comfort of the latter, a fully automated fixation control system, the use of a magnetic-tape recording system, providing analytical programs for the computer and recording computer-answers at the same time. On the other hand, progress has been made in the optimisation of threshold determination methods in the visual field and in the design of methods for the graphical display of the sensitivity distribution across the visual field.

Data Display↗

PubMed1975