The spectral transmittance of hydrogel contact lens filters.

The spectral transmittance characteristics of each of thirty-two solid tint hydrogel contact lenses available in the United Kingdom were investigated using a dual beam spectrophotometer. Good agreement was found with the small number of spectral functions that had previously been published. Lenses with similar colour appearances were seen to differ markedly in terms of their transmittance factors. The importance of visual performance and radiation protection is discussed in the light of the spectral transmittances of the lenses.