Human Eye Anatomy

In this video, I explain the 3 main layers (tunics) that form human eyeball: fibrous layer (sclera and cornea), vascular layer (choroid, ciliary body, iris), inner layer (retina), and the major functions of each anatomical structure including the main structures involved in light refraction (focusing the light), the anatomy of the lens and how its curvature and thickness change due to the contraction and relaxation of the ciliary muscle and change in the tightness of the zonular fibers (suspensory ligaments) for far or near vision, how radial and circular muscles in iris respond to sympathetic and parasympathetic stimulation and change the diameter of pupil, the formation and major functions of the two fluids (aqueous humor and vitreous humor) inside the anterior and posterior cavities/segments of the eyeball, the main layers found in retina (pigmented layer, neural layer: photoreceptor layer, bipolar layer, ganglion layer), the formation of optic nerve (cranial nerve II), major landmarks in retina visible through ophthalmoscopes (optic disc/blind spot, macula lutea, fovea centralis).