The Refractive media of eye include the cornea, the aqueous humor in the anterior and in posterior chambers, the lens and the vitreous humor. The cornea is described earlier in the fibrous tunic. The aqueous humor is a clear fluid of an alkaline reaction, consisting chiefly of water with a trace of albumin and chloride or sodium. It fills the anterior and posterior chambers of the […]
The Retina of eye or Nervous tunic forms the innermost tunic of the eyeball and extends from the entrance of the optic nerve to the iris. It consists of three parts; a posterior part the essential region containing the special neuroepithelium, the pars optica retinae. This terminates around the ciliary body where it ends in a regular
Iris of eye is a muscular diaphragm placed in front of the lens and is visible through the cornea. It is pierced centrally by an elliptical opening, the pupil. The ciliary border is continuous with the ciliary body and is connected with the ligamentum pectinatum iridis. The pupillary border surrounds the pupil. The upper margin
Ciliary body of eye is the middle part of the vascular tunic and connects the chorioid with the periphery of the iris. In meridional section, it is triangular in outline with the base next to the iris. It consists of three parts, ciliary ring, ciliary processes and ciliary muscle. The ciliary ring is continuous with the anterior part
Choroid of eye ball is a thin membrane lying between the sclera and retina. It is loosely attached to the sclera by the lamina fusca except where vessels and nerves pass through. The internal surface is in intimate contact with the pigmentary layer of the retina. The chorioid is generally dark brown in colour but
The Sclera of eye ball is a dense white fibrous membrane forming about four fifths of the fibrous tunic of the eyeball. Thickest in the vicinity of the posterior pole, it thins at the equator and increases in thickness toward the junction with the cornea. It is often pigmented. When non-pigmented it shows a bluish
The cornea forms the anterior one fifth of the fibrous tunic. It is transparent, colorless, and avascular. It is oval, the broad end being medial. The anterior surface is convex and more curved than the sclera. The posterior surface is concave and forms the anterior boundary of the anterior chamber. The margin joins the sclera where the sclera overlaps
The tunics are three in number-external fibrous, middle vascular and internal nervous. Fibrous tunic of eye ball The fibrous tunic is composed of an anterior transparent, avascular part called the cornea and a posterior opaque, vascular part known as the sclera.
Peri-orbita of eye ball is a conical fibrous sheath that encloses the eyeball with muscles, vessels and nerves. Its apex is attached around the optic and orbital foramina and its base is in part attached to the bony rim of the orbit, in part continues with the fibrous layer of the lids. Its medial part
Anatomy of Eye The eye is the organ of vision. Anatomy of Eye comprises of the eyeball, optic nerve and certain associated structures as orbit, orbital fasciae, muscles, eyelids, conjunctiva and lacrimal apparatus. The Science dealing with the structure, functions and diseases of the eye is known as Ophthalmology. The powers of vision and the adaptation of lenses or prisms
