The human eye comprises specialized anatomical structures that work in concert to enable visual function. The choroid, a vascular layer providing metabolic support to the retina, varies in thickness and is evaluated using metrics like the choroidal vascular index (CVI). The multilayered retina, responsible for phototransduction, includes layers such as the nerve fiber layer, ganglion cell layer, and photoreceptor layer, each with characteristic thickness and flow profiles. The vitreous body maintains ocular structure but exhibits minimal dynamic flow. The optic nerve, with a million axons, transmits visual signals and is evaluated via diameter, length, and other parameters. Other integral structures include the ciliary body (aqueous production and accommodation), cornea (refraction and protection), iris and pupil (light regulation), and lens (focusing). Supporting tissues as in the sclera and eyelids maintain integrity and defense. Quantitative data on dimensions, vascularity, and flow dynamics underpin diagnostics, disease monitoring, and surgical planning in ophthalmology.