Difference Between Sclera and Conjunctiva
Sclera and conjunctiva are essential components of the eye and serve as protective layers. The sclera covers more than 80% of the eye and includes the cornea, while the conjunctiva is a thin, transparent layer that lies on the sclera and the interior lining of the eyelids. The main difference between these two structures is that the conjunctiva is highly vascularized, while the sclera has a limited blood supply.
Category |
Conjunctiva |
Sclera |
Description | The thin, translucent membrane covers the sclera of the eye, except the cornea. | The outermost layer of the eye covers the eyeball. |
Composition | Made up of non-keratinized, stratified columnar epithelium, stratified squamous epithelium with goblet cells, and stratified cuboidal epithelium. | Composed of elastic and collagen fibers. |
Color | Transparent with a pinkish hue due to the underlying blood vessels. | Opaque white. |
Vascularisation | Highly vascularized with numerous microvessels. | Less vascularized compared to the conjunctiva. |
Thickness | Very thin, averaging around 0.5 mm. | Thick, averaging around 1 mm. |
Function | Secretes tears and mucus that lubricate the eyes and prevent the entry of microorganisms. | Provides a protective layer for the eyeball and an attachment site for ocular muscles |
Difference Between Sclera And Conjunctiva
The human eye is a crucial body part consisting of several structures, including the iris, pupil, cornea, sclera, and conjunctiva. The conjunctiva and sclera are two essential components of the eye’s defense system. The conjunctiva is a thin layer of tissue that lines the eye and eyelids and helps maintain a balanced tear film while also providing protection against foreign objects and infections. The sclera, on the other hand, is a sturdy connective tissue composed of collagen and elastin that surrounds and gives the eye its shape. The sclera connects to the cornea at the front of the eye and joins with choroidal tissue at the back of the eye via the optic nerve. Maintaining the integrity of both the conjunctiva and sclera are vital for the overall health of the eye, as abnormalities or inflammation can lead to significant disruptions in the ocular system.
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