The first portrait in the exhibition (see notice n°2, and about eye color, see last paragraph).
Un Siècle de vision nouvelle, Paris, Bibliothèque Nationale, [Galerie Mansart], 1955.
Catalogue rédigé par Jean Adhémar, avant-propos de Julien Cain, introduction de Jean Vallery-Radot.
Complete catalogue available online : Gallica
Next question will be, is there a way to reliably determine the eye color from monochrome photos in general ?
Early photographic emulsions were orthochromatic, not panchromatic.
Which means they were more sensitive to blue and green light. Daguerreotype does not register the same spectrum as waxed paper or collodion on glass negatives processes.
And eyes can look dark or light in photos depending on the lighting and the camera setup.
A closer look indicates the eyes where retouched in the negative.