We read with interest the study by Seitz et al,1 which was published in the August 1996 issue of the Archives.
Apart from the slight mismatch concerning products and companies in the "Subjects and Methods" section, we want to focus on the results and their interpretation with reference to the difference observed between white and nonwhite volunteers.
The authors underlined the fact that a racial difference has not been reported on sensitivity of the cornea. Nevertheless, Millodot2 has already emphazised the difference between whites and blacks. Similarly, he underlined the variation of corneal sensitivity according to the color of the eye.2,3 With white volunteers, blue eyes are on average twice as sensitive as brown eyes. These data were reviewed by Martin and Safran4 in 1988, and they mentioned that such a difference could be dependent on the amount of neuromelanin in areas of the central nervous
Villain M, Trinquand C, Arnaud B. Corneal Sensitivity Debate. Arch Ophthalmol. 1997;115(5):686. doi:10.1001/archopht.1997.01100150688031