Light scattering in poly(vinyl alcohol) hydrogels reinforced with nanocellulose for ophthalmic use

Scattering of ophthalmic devices is a complex phenomenon involving both surface and bulk light-material interactions. In this work, light scattering of nanocellulose reinforced PVA hydrogels contact lenses for ophthalmic applications was investigated. Optical microscopy, fluorescence microscopy and...

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Bibliographic Details
Published in:	Optical materials express Vol. 7; no. 8; p. 2824
Main Authors:	Tummala, Gopi Krishna, Felde, Nadja, Gustafsson, Simon, Bubholz, Adrian, Schröder, Sven, Mihranyan, Albert
Format:	Journal Article
Language:	English
Published:	Washington Optical Society of America 01-08-2017
Subjects:	Atomic force microscopy Contact lenses Distribution functions Engineering Science with specialization in Nanotechnology and Functional Materials Fluorescence Hydrogels Light Light levels Light scattering Microscopes Microscopy Optical microscopy Teknisk fysik med inriktning mot nanoteknologi och funktionella material Visual acuity White light interferometry
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Summary:	Scattering of ophthalmic devices is a complex phenomenon involving both surface and bulk light-material interactions. In this work, light scattering of nanocellulose reinforced PVA hydrogels contact lenses for ophthalmic applications was investigated. Optical microscopy, fluorescence microscopy and atomic force microscopy (AFM) techniques were used for ultrastructure characterization. Further, 3D angle resolved light scattering measurements in the visible spectral range were performed using a BTDF (bidirectional transmittance distribution function) sensor to quantify the scattered light. Surface and bulk scattering properties were discerned using white light interferometry. Total scatter levels ranging from 3% to 40% were observed depending on the hydrogel composition. The most critical factor affecting the light scattering properties in nanocellulose-reinforced PVA hydrogels was related to the state of hydration of the hydrogels, which is critical to maintain visual acuity of ophthalmic devices.
ISSN:	2159-3930 2159-3930
DOI:	10.1364/OME.7.002824