Tissue autofluorescence signal is weak compared to white light reflectance imaging. The proposed solution is based upon interference rather than diffraction effects and thus it is characterized by high energetic efficiency to the retina plane as well as reduced chromatic aberrations.Īutofluorescence endoscopy is a promising functional imaging technique to improve screening of pre-cancerous or early cancer lesions in the gastrointestinal (GI) tract. Conclusions: The extended depth of focus technology in a non-toric contact lens corrects simultaneously astigmatism and presbyopia. Average correction of 0.70D for astigmatism and 1.50D for presbyopia was demonstrated. Results: The contact lens was tested on a group of 8 astigmatic and 13 subjects with presbyopia. Due to the angular symmetry of the engraved pattern the extension in the depth of focus can also resolve regular as well as irregular astigmatism aberrations. The extension in the depth of focus provides high quality focused imaging capabilities from near through intermediate and up to far ranges. ![]() ![]() These grooves create an interference pattern extending the focus from a point to a length of about 1mm providing a 3.00D extension in the depth of focus. ![]() ![]() Methods: The extended depth of focus pattern consisting of microndepth concentric grooves was engraved on a surface of a mono-focal soft contact lens. Purpose: Testing whether the extended depth of focus technology embedded on non-toric contact lenses is a suitable treatment for both astigmatism and presbyopia.
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