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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:11 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
Positron annihilation lifetime spectroscopy analysis of UV irradiated contact lenses (ocufilcon D) - (1)
Authors:
Paul-Emil MEREUȚA (1,2)
Affiliation:
1)Horia Hulubei National Institute of Physics and Nuclear Engineering
2)University of Bucharest, Faculty of Physics
E-mail
pmereuta@yahoo.com
Keywords:
positron, annihilation, lifetime, contact lenses, UV light, irradiance, polymer, free volume
Abstract:
We have analyzed, soft contact lenses (CL), made of 45% polymer (ocufilcon D) and 55% water, that are used in vision correction treatments. The purpose of our analysis was to see the evolution of this type of lenses, under UV irradiation, as in treatments the contact lenses can be used daily and are exposed for 8-10 hours per day to the Sun and the UV light can affect them. We irradiated the lenses using a UV lamp of irradiance 12 mW/cm2. Another goal was to see if the recommended seven days use of one pair is fair. The analysis of the contact lenses was made using positron annihilation lifetime spectroscopy, as it can give us an insight on how the free volume present in the polymer evolves.
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