The macula is a highly sensitive part of the
                                                        retina that is responsible for our detail vision.
                                                        The center of the macula, which has a major
                                                        role in detail perception, is called the fovea.
                                                        Optic Nerve: It carries the information from
                                                        the eye to the brain. It consists of over one
                                                        million axons, which carry visual information
                                                        to different parts of the brain.
                                                        Blind Spot : This is a bit of your retina which
Parts of Human Eye
                                                        is not sensitive to light because there are no
Sclerotic: It is the white outer part of the eye        rods or cones there. It is the spot where the
that you can see. It provides protection and            optic nerve is joined on to the retina.
structure for the inner parts of the eye.
                                                        Yellow Spot : It is the central part of retina
Cornea: It is the clear bulging surface in front        lying on the optic axis of eye is most sensitive
of the eye. It is the main refractive surface of        to light.
the eye.
                                                        Eye Lids : Its main function is to protect the
Iris: It controls the size of the pupil and the         eyes by blinking. Blinking prevents debris
amount of light that enters the eye. It is the          from getting into the eye. The average blink
coloured part of your eye.                              rate is 10 blinks per minute.
Eye Lens: It focuses light onto the retina. It is       Ear
a double convex lens with the help of which
                                                            It receives sound and helps in balance and
image is formed at retina by refraction of light.
                                                             body position.
Ciliary Muscles: The eye lens is held by                    The human ear can generally hear sounds
ciliary muscles which helps the eye lens to                  with frequencies between 20 Hz and 20
change its focal length.                                     kHz.
                                                            The ear has external, middle, and inner
Pupil: It is the black hole in the center of the             portions.
colored iris. It contracts when exposed to                  The outer ear is called the pinna and is
bright light and expands in darkness to allow                made of ridged cartilage covered by skin.
more light into the eye.
                                                            Sound funnels through the pinna into the
Aqueous humour: It is the transparent fluid                  external auditory canal, a short tube that
between cornea and eye lens.                                 ends at the eardrum (tympanic
                                                             membrane).
Vitreous Humour: It is the transparent fluid                Sound causes the eardrum and its tiny
between eye lens and retina.                                 attached bones in the middle portion of the
                                                             ear to vibrate, and the vibrations are
Retina: It is the innermost layer of sensitive               conducted to the nearby cochlea.
tissue that transmits light to the brain. The
                                                            The spiral-shaped cochlea is part of the
retina consists of several types of cells,
                                                             inner ear; it transforms sound into nerve
including a layer of rods and cones, which
                                                             impulses that travel to the brain.
transform light into chemical and electrical
                                                            The fluid-filled semicircular canals
energy that is transmitted to the optic nerves.
                                                             (labyrinth) attach to the cochlea and
The center of the retina contains the macula.
                                                             nerves in the inner ear. They send
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