If you desire to make pathological knowledge the groundwork of your credit and usefulness through life, let me advise you not to allow the period of your pupilage to pass by without making a special study of the diseases of the eye. Here you see almost all diseases in miniature; and from the peculiar structure of the eye, you see them as through a glass; and you learn many of the little wonderful details in the nature of morbid processes, which, but for the observation of them in the eye, would not have been known at all. Let every one of you who has a few months to spare give them to the Eye Infirmary.
The eye might have been intended to furnish us a little model for studying processes of disease and processes of reparation as they go on in all parts of the body, so admirably does it
Bean WB. Stereoscopic Manual of the Ocular Fundus in Local and Systemic Disease.. Arch Intern Med. 1965;116(1):147-148. doi:10.1001/archinte.1965.03870010149020