In eyes with PEX no increased cell loss was found in the early postoperative period compared to normal eyes following corneoscleral tunnel incision and phacoemulsification. Due to preoperative reduced endothelial cell densities, endothelium-protecting measures are recommended in eyes with PEX.
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Infrared light two-photon excitation provides a new parameter for testing visual function, one that can be used in the detection and monitoring of ocular abnormality. Diabetic retinopathy significantly impairs retinal sensitivity to infrared light.
Depth of focus can be enhanced with cubic phaseplates located at the exit pupil of an optical system without significant loss of resolution. The enhancement factor is proportional to the strength of the phaseplate. The digital image is inversely filtered. The stronger the phaseplate is the stronger the inverse filter function must be. This causes increasing noise for high spatial frequencies in the restored image. Therefore, an optimum strength of the cubic phaseplate has to be chosen for the respective situation. A variable phaseplate system has been realized and tested. The performance of the setup has been experimentally studied. Applications and practical aspects are discussed in particular regarding barcode readers.
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