Anatomy and physiology of the eye, with hints for the preservation of the eyesight
A short self-published optical manual by John Frederick Herbert, issued in Philadelphia in 1901 for opticians and lay readers wanting to understand the eye and protect their sight. The plates are white-line diagrams reversed out of solid black rectangles, showing eyeball cross-sections with parallel rays bending through corrective lenses to focal points marked F and F', plus anatomical figures of the eye's parts.
