Tribological properties of contact and spectacle lenses

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21460%2F21%3A00356666" target="_blank" >RIV/68407700:21460/21:00356666 - isvavai.cz</a>
Result on the web
<a href="http://imbm.fbmi.cvut.cz/soubory/Sborniky/IMBM%202021" target="_blank" >http://imbm.fbmi.cvut.cz/soubory/Sborniky/IMBM%202021</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Tribological properties of contact and spectacle lenses
Original language description
This article deals with tribological properties of contact and spectacle lenses, especially the friction coefficient. Friction coefficient in contact lenses is bound with comfortable wear and in spectacle lenses is this coefficient dependant on the durability of the lens. Three types of contact lenses – 2 siliconhydrogel and 1 hydrogel contact lenses, and two spectacle lenses from different manufacturers (OMEGA and ZEISS) were measured. Wearability test was performed by Tribometr Pin-on-Disk (TRB3 - Anton Paar) with linear movement – trajectory was 8 mm for spectacle lenses, and 3 mm for contact lenses. Chromium steel testing ball (Ball type: Ac 100 Cr6) with a 6 mm diameter was used during both of measurement. The outcome of our measurement of contact lenses was, that with increasing sliding speed during measurement the friction coefficient increases as well and with constant sliding speed and increasing applied force the friction coefficient decreases. Measurement of spectacle lenses showed that spectacle lenses with enhanced surface are not being scratched for 0.25 N of applied force. The damage of this type of spectacle lenses occurs with bigger applied force (0.5 N; 0.1 N). Each spectacle lens was evaluated under microscope and the scratch width was measured.
Czech name
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Czech description
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Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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