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Reading fine print uses your fovea — each word lands on a 1.5mm high-resolution patch. The fovea (macula's center — dense cones, 1.5mm): sharp central vision — reading, faces. Rods (periphery — night vision) vs cones (color, detail). Light path — cornea (2/3 focusing) → pupil (iris aperture) → lens (fine tune — accommodation: ciliary muscle contracts, zonules slacken, lens rounds for near) → vitreous → retina (phototransduction — rods/cones → bipolar → ganglion → optic nerve → visual cortex). Aqueous (ciliary body → trabecular meshwork → Schlemm's canal) nourishes; blocked drainage = glaucoma. The eye is a camera — cornea the main lens, retina the film.