Here are the links to the two articles David Thaler prepared after his October 2019 presentation during the international colloquium on Leonardo Anatomist, in Amboise, France. Those will be included in a soon-to-be published book of the proceedings in the CNRS Editions.
Early manuscripts:
Thaler, Evidence for extraordinary visual acuity in Leonardo’s comment on a dragonfly, Jan. 2, 2020
Thaler, Sfumato in Leonardo’s Portraits: Optical and Psychophysical mechanisms, Jan. 4, 2020