Sense organs are organs made up of a group of specialised cells or receptors which can receive a stimulus and transmit the information to the nervous system e.g. ear, skin.
The eye is the sense organ of sight. It is situated in the socket or orbit of the skull. The eyelids have eyelashes which prevents dust particles and insects from entering the eyes.
i) Short-sightedness or myopia: Ability of the eye to focus clearly only on nearby objects.
CAUSE: Large or elongated eyeballs.
CORRECTION: Wearing glasses or contact lenses with concave lenses
ii) Astigmatism: Astigmatism is caused by unequal curvature of the eyeball. It can be corrected by wearing of cylindrical lenses.
iii) Long-sightedness: Ability of the eye to focus clearly only on distant object.
CAUSES: Small or short eyeballs.
CORRECTION: Wearing of glasses or contact lenses with convex lenses.
iv) Cataracts: This is the opacity of the lens which may be caused by bacterial infection.
v) Conjunctivitis: This is the inflammation of the conjunctiva due to irritants or bacterial infection.
The ear is the sense organ responsible for hearing and balancing.
STRUCTURE: The mammalian ear can be divided into the outer, middle and inner ear.
The part of the ear external to the eardrum. It includes the pinna, which directs sound along the auditory canal to the eardrum.
Air caval and air-filled cavity. It contains the malleus, lucus and stapes , collectively known as ossicles which amplify sound.
The inner ear contains the organs of hearing and balance enclosed in a bony case in the skull. The cochlea is a spirally coiled tube filled with a fluid called perilymph.
For more on this topic visit Anatomy and Structure of Human Sense Organ