ISSN:
1573-9686
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
,
Technology
Notes:
Abstract An ocular model is postulated to describe the refraction of microwaves (1 to 35 GHz) impinging on the eye from free space. Results from several semiempirical computations in which experimentally determined dielectric constants and electrical conductivities were incorporated into the model suggest that the focal point for an impinging paraxial beam of microwaves occurs a few millimeters behind the posterior center of the lens. The distance between the posterior center of the lens and the focal point is shown to increase with frequency, whereas the computed penetration depth of the lens at the anterior and posterior center is shown to decrease with frequency. A comparison between the model computations and experimentally induced cataractogenesis at various frequencies suggest that refraction is a significant factor in the lower frequency region (f〈5 GHz), whereas in the higher frequency region (f〉5 GHz) penetrationdepth effects become increasingly important.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02364478
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