Do Human Tears Absorb Ultraviolet Light?

Abstract
We analyzed human tears by ultraviolet (UV) spectrophotometry for transmittance of UV light. Ultraviolet light was readily transmitted through human tears in the UV-A (320–400 nm) and UV-B (290–320 nm) ranges. Tears partially absorbed UV light in the UV-C (100–290 nm) range. The clinical implications of these findings include prevention of phototoxic ocular damage and effects upon excimer laser corneal photoablative techniques.

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