In response: Changes in ultraviolet transmittance of hydrogel and silicone hydrogel contact lenses induced by wear

Osuagwu, Uchechukwu L., Ogbuehi, Kelechi C., & Almubrad, Turki M. (2015) In response: Changes in ultraviolet transmittance of hydrogel and silicone hydrogel contact lenses induced by wear. Eye and Contact Lens, 41(4), pp. 252-254.

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We thank Dr Shedden and Dr Pall for their insightful comments and the opportunity to clarify a number of points from our work.1 The “protection factor” (PF) expressed as the inverse of the transmittance of contact lens (CL) material (1/Tλ), where T is the percentage transmittance of ultraviolet radiation (UVR) in a given waveband (UVC, UVB or UVA) of the UV spectrum for contact lenses is the standard method for reporting PF values and as such there should not be any controversy. We have calculated the PF for each wavelength across the entire UV spectrum (UVC, UVB, UVA) as presented in figure 3 of our previous publication.1 In that article, we were simply stating the observation when transmission in the UVC spectra band is considered especially because appreciable amounts of potentially carcinogenic short UV wavelengths was shown to be present in sunlight in our region three decades ago2 and these short wavelength photons are reported to be more biologically damaging to ocular tissues.3 In addition, the depletion of the Ozone layer is still continuing. Nevertheless, we understand the concern of the authors that the results of the PF might be confusing to those who are not familiar with the science of UVR and as such we have made some revisions to the findings of the calculated PF...

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ID Code: 84689
Item Type: Journal Article
Refereed: Yes
DOI: 10.1097/ICL.0000000000000160
ISSN: 1542-2321
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2015 Lippincott Williams & Wilkins
Copyright Statement: This is a non-final version of an article published in final form in Eye & Contact Lens: Science & Clinical Practice:
July 2015 - Volume 41 - Issue 4 - p 252–254, doi: 10.1097/ICL.0000000000000160
Deposited On: 08 Jun 2015 23:28
Last Modified: 09 Aug 2016 09:15

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