This is an example of portfolio detail

LEONARDO made an important contribution to the study of optics when he realized that the eye and its pupil operated like a camera, in that images were reversed and inverted when they entered the eye. However, unable to accept that images are received as such by the senses he explained their re-inversion within the eye, he invented a second point of 'intersection' by which they were righted. It was not until 1604 that KEPLER realized that inverted images were received on a concave retina.

'Kepler's discovery of the path of light in the eye made it possible to explain the following physical phenomena: central visual acuity, visual field, dark adaptation, and errors of refraction. Physiological diplopia and the mechanism of accommodation were discovered later.'
^{https://pubmed.ncbi.nlm.nih.gov/3520121/}