Figure 2. Lens transmission changes as a function of age.

Relative L,M,S cone absorptions as a function of age were derived from the lens model by Pokorny et al [16]. To calculate the age-related relative loss in the three cone classes (L,M,S), the tabulated 2-deg cone fundamentals derived by Stockmann and Sharpe [20] were multiplied with the linear lens transmission (up to 650 nm), for each year of age. The resulting loss in the L,M,S cone signals a function of age is normalised to unity at 32 years of age.