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Area of Science:

  • Ophthalmology
  • Photoprotection
  • Materials Science

Background:

  • Consumer awareness of Sun Protection Factor (SPF) is high for skin products.
  • Ultraviolet radiation (UV) exposure poses risks to ocular health.
  • The need for quantifiable UV protection metrics for contact lenses (CLs) is recognized.

Purpose of the Study:

  • To explore the application of SPF principles to contact lenses for UV protection (CL-SPF).
  • To quantify the UV blocking capabilities of various contact lens materials.
  • To assess the potential of CL-SPF as a consumer-facing metric.

Main Methods:

  • Measured UV transmission of 15 CLs and 3 spectacle lens materials using spectrophotometry.
  • Calculated CL-SPF values using the standard in vitro method for skin products.
  • Assessed in vitro cellular damage profiles of corneal and conjunctival cells to inform an SPF equivalent.

Main Results:

  • CLs categorized into three CL-SPF groups: no UV blocker (1.0-2.0), Class 2 UV blocker (12.3-24.8, SPF15 equivalent), and Class 1 UV blocker (59.6-66.2, SPF50+ equivalent).
  • Ocular surface protection from sunglasses can be significantly reduced by solar angle and head orientation.
  • Conjunctival cells exhibit higher susceptibility to UV damage compared to corneal cells.

Conclusions:

  • CL-SPF is a viable metric for communicating UV protection offered by CLs.
  • CL-SPF effectively conveys the UV absorption/transmission properties of contact lenses.
  • The protective coverage of soft CLs is limited to the cornea and internal eye tissues.