Matlab files for simulate elderly vision

CONTENTS------------------------------------------------------------ elderly_sim.m Main function. All four stages of the model (lens yellowing, senile miosis, Brettel tritan, optional cataract) plus the appearance-mode cortical renormalisation. Self-contained, no toolboxes. lens_tables_10nm.m Embedded 10 nm spectral tables (400-700 nm): CIE 1931 2 deg CMFs, D65 SPD, Pokorny-Smith- Lutze lens template f(lambda), and an sRGB reflectance basis in the spirit of Mallett & Yuksel 2019. Also returns the pre-computed 3-channel effective lens weights. elderly_sim_demo.m Executable demonstration. Prints Table 3 of the manuscript, generates a synthetic Macbeth ColorChecker chart, renders it at ages 60/75/85 in every mode, and writes the outputs to ./demo_out/.