important characteristics of a normal eye ?
Answers
Characteristics and Functions
Thin folds of skin that cover and protect the cornea and conjunctiva from chemical and physical injury.
Short, stiff hairs that shield the eye from irritants such as dust
Opaque, tough outer layer of the eye, known as the "white of the eye"
Protects the inner structures of the eye
Transparent, five layered membrane that is continuous with the sclera.
Refracts light rays that reach the eye, providing most of the refracting or focusing power.
Focusing power is fixed unlike the lens
Transparent membrane that covers the sclera and lines the inner surface of the eyelids
Secretes mucus and a small volume of tears to keep the eye moist.
Secretes tears (contains salts and a bacterial enzymes) which
Washes out foreign particles or chemical irritants
Lubricates the conjunctiva, reducing friction between the eyelids and the eyeball.
Prevent the eye from drying out. The tear film allows atmospheric oxygen to dissolve and diffuse into the cornea
A pigmented layer of muscular tissue that gives the eye its colour.
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Answer:
Characteristics of the HUMAN EYE (What can be seen from the outside)
Structure
Eyelids
Eyelashes
Sclera
Cornea
Conjunctiva
Tear gland
Iris
Pupil
Characteristics and Functions
Thin folds of skin that cover and protect the cornea and conjunctiva from chemical and physical injury.
Short, stiff hairs that shield the eye from irritants such as dust
Opaque, tough outer layer of the eye, known as the "white of the eye"
Protects the inner structures of the eye
Transparent, five layered membrane that is continuous with the sclera.
Refracts light rays that reach the eye, providing most of the refracting or focusing power.
Focusing power is fixed unlike the lens
Transparent membrane that covers the sclera and lines the inner surface of the eyelids
Secretes mucus and a small volume of tears to keep the eye moist.
Secretes tears (contains salts and a bacterial enzymes) which
Washes out foreign particles or chemical irritants
Lubricates the conjunctiva, reducing friction between the eyelids and the eyeball.
Prevent the eye from drying out. The tear film allows atmospheric oxygen to dissolve and diffuse into the cornea
A pigmented layer of muscular tissue that gives the eye its colour.
Has two sets of involuntary muscles (circular and radial) which controls the diameter of the pupil, and hence the amount of light entering the eye.
An opening at the centre of the iris
Permits light to enter the eye
Explanation: