Does blue-violet filtering in contact or ophthalmic lenses improve contrast sensitivity?

The effects of blue-violet filtering lenses (yellow lenses) on visual performances and more specifically on contrast sensitivity (CS) are still debated in the literature. In this work, results obtained with contact lenses (CLs) and ophthalmic lenses (OphLs) with different optical properties are compared and discussed. A negative statistically significant (p < 0.05) moderate correlation of the CS variation with different lenses as a function of the CS of the subject with the clearer one was observed. This means that filtering is expected to produce a CS worsening in subjects showing a relatively high initial CS. On the contrary, subjects showing a relatively low initial CS are expected to show a CS improvement.