Stockman, Sharpe & Fach (1999) lens density spectrum also in Stockman & Sharpe (2000)

Data key

  1. Wavelength (nm)
  2. Lens density


    Tabulated at 0.1, 1 or 5 nm steps. The 0.1 and 1 nm functions were obtained by the interpolation of the 5 nm functions using a cubic spline. Slightly adjusted version of the lens density spectrum of van Norren & Vos (1974) by Stockman, Sharpe and Fach (1999).  The small adjustments to the lens density spectrum yield smooth curves when the Stockman and Sharpe (2000) 2-deg or 10-deg cone fundamentals are corrected to cone photopigment curves.  Without this small correction, the photopigment curves have a clear discontinuity in the violet.

These values are for a small pupil. For an open pupil, divide by 1.16.


Stiles, W. S., & Burch, J. M. (1959). NPL colour-matching investigation: Final report (1958). Optica Acta, 6, 1-26.

Stockman, A., Sharpe, L. T., & Fach, C. C. (1999). The spectral sensitivity of the human short-wavelength cones. Vision Research, 39, 2901-2927.

Stockman, A., & Sharpe, L. T. (2000). Spectral sensitivities of the middle- and long-wavelength sensitive cones derived from measurements in observers of known genotype. Vision Research, 40, 1711-1737.

van Norren, D. & Vos J.J. (1974) Spectral transmission of the human ocular media Vision Research, 14, 1237-1244.