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Biomedical subjects

W Ambach

Publications and source records attributed to W Ambach.

40 records · Page 3Linked to original sources
PubMed1983

[A graphic method for determining the refractive power of intraocular lenses].

A nomogram has been developed for determining the refractive power of emmetropic intraocular lenses. Individual deviations of optical dimensions from mean values, such as axis length, anterior chamber depth and corneal curvature are used to find a graphical solution. Errors of measurement of optical dimensions are analyzed with regard to their influence on the refractive power of an intraocular lens; errors in measuring the length of the axis have the greatest influence. The nomogram represents a simple method of determining the refractive power of an emmetropic lens. Furthermore, residual refraction can be determined if an intraocular lens of a given power is used or if postoperative ametropia is desired.

Eye↗
PubMed1982

[Nomogram for determining the refraction of intraocular lenses].

A nomogram for determining the refraction of intraocular lenses was developed to define the following diagnoses: emmetropizing lens, residual refraction of a given lens refraction and desired postoperative refraction. The nomogram makes an approximation solution possible to determine the refractive power of intraocular lenses from the basic refraction and the refractive power of the cornea.

Humans↗
PubMed1981

[Determination of refractive status in groups by laser (author's transl)].

It was tried to demonstrate the laser-test simultaneously great groups of persons and thus to divide them roughly into prospective emmetropes and different ametropes. For that an interference-phenomenon of laser-light on a screen is used to determine the refractive status. If the head is moved slowly in one direction, myopes register a movement of the interference-pattern in the contrary sense, hyperopes a movement in the same sense, while emmetropes do not recognize a direction of movement. The refractive status of 139 students was investigated. The results of the laser-test with a small group of 24 students were compared with the results of retinoscopia, in the course of which the laser-test proved to be very sensitive. In 86% of the cases laser correction and retinoscopic correction were identical within a variation of +/- 0.25 dpt. All ametropic patients were detected with great certainty. Even negligible, subjectively not perceptible ametropia could be detected. Thus it was shown, that only 60% of those, who have been found to be ametropic by the laser-test, really do need glasses or a better correction. For determination of astigmatism further experiments are necessary.

Adolescent↗