2 November 2011 Optical phenomena in microprism diagnostic set KK-42
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Abstract
Microprism diagnostic set KK-42 for ophthalmology application comprises 42 separate microprism elements - strabismus optical compensators and it is designed for the image displacement at vision diagnostics. The main requirement for optical compensators is high quality of observed images. However, strong diffraction phenomena and chromatic aberrations due to light dispersion exist for microprisms similar to any other prismatic systems. Structure simulation was carried out to minimize the acuity degradation and to avoid observed image discretization. The simplest method to diminish aberrations is the application of filters and colour plastics. Experiments and calculations were performed which showed the opportunity to diminish twice the chromatism zone by filters to the value of 20-25 angular minutes. Another method of decreasing chromatic aberrations is application of additional prism microrelief - saw tooth diffractive optical element. In optical compensators the first microrelief with the pitch of 600-800 μm serves as a refractive prism. Diffractive element with the pitch of 15-20 μm operating in first diffractive order is optimized in such a way that dispersion of the first diffractive order compensates dispersion of the compensator. This method allows to compensate dispersion totally at any spectrum zone.
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Viacheslav Petrov, Andriy Kryuchyn, Eugene Antonov, Anatoly Lapchuk, Semen Shanoylo, "Optical phenomena in microprism diagnostic set KK-42", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80119A (2 November 2011); doi: 10.1117/12.900751; https://doi.org/10.1117/12.900751
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