Human Eye and Defects of Vision
Every day you ‘see’ beautiful things around you. You don’t just ‘see’
things you observe them, analyze them and then you either keep
staring or choose to ignore. What enables us to look at things around
us? What makes human eye so wonderful and essential? Yet, if on one
hand, our eyes enable us to have a look at the world around us; it also
carries some defects. Let us know more about the human eye and its
defects below.
The Human Eye and Its Structure
,‘Human Eye’ is the organ of vision of the human body that enables us
to see. The human eye(s) are located in the specialized sockets carved
out in the human skull. Each human eye sizes for approximately 2.5
cm in diameter. The main parts of a human eye are:
Sclera
The white outer region of our eye which protects the internal parts of
our eyes is known as ‘sclera‘. Its made up of fibrous tissues. It’s
continuous with the cornea.
Cornea
The transparent portion of our eye that allows the light to enter our eye
is known as the ‘cornea’ and is made up of transparent tissue. The
cornea covers the pupil, anterior chamber, and the iris. Along with the
anterior chamber and lens, cornea refracts light and accounts for
two-thirds of the eye’s total power. Usually, the refractive power of
the cornea is approximately 43 dioptres.
Iris
, A circular, thin structure made up of contracting and relaxing muscles
in the eye that controls the size of the pupil and the light reaching the
retina are known as the ‘iris’. Iris defines a person’s eye color. If we
define the human eye as a camera then the iris becomes aperture of the
eye.
Pupil
The part of the eye located in the center of the iris allowing light to
reach the retina. The pupil appears black in color since the eye tissues
absorb or diffusely reflect the light entering the pupil. Iris controls the
pupil.
Lens
The lens is a biconvex, transparent structure present in the eye behind
the pupil. The lens along with the cornea refracts the light, so as to
focus it on the retina. By changing its shape, the lens is capable of
changing the focal distance of the eye.
Retina
Every day you ‘see’ beautiful things around you. You don’t just ‘see’
things you observe them, analyze them and then you either keep
staring or choose to ignore. What enables us to look at things around
us? What makes human eye so wonderful and essential? Yet, if on one
hand, our eyes enable us to have a look at the world around us; it also
carries some defects. Let us know more about the human eye and its
defects below.
The Human Eye and Its Structure
,‘Human Eye’ is the organ of vision of the human body that enables us
to see. The human eye(s) are located in the specialized sockets carved
out in the human skull. Each human eye sizes for approximately 2.5
cm in diameter. The main parts of a human eye are:
Sclera
The white outer region of our eye which protects the internal parts of
our eyes is known as ‘sclera‘. Its made up of fibrous tissues. It’s
continuous with the cornea.
Cornea
The transparent portion of our eye that allows the light to enter our eye
is known as the ‘cornea’ and is made up of transparent tissue. The
cornea covers the pupil, anterior chamber, and the iris. Along with the
anterior chamber and lens, cornea refracts light and accounts for
two-thirds of the eye’s total power. Usually, the refractive power of
the cornea is approximately 43 dioptres.
Iris
, A circular, thin structure made up of contracting and relaxing muscles
in the eye that controls the size of the pupil and the light reaching the
retina are known as the ‘iris’. Iris defines a person’s eye color. If we
define the human eye as a camera then the iris becomes aperture of the
eye.
Pupil
The part of the eye located in the center of the iris allowing light to
reach the retina. The pupil appears black in color since the eye tissues
absorb or diffusely reflect the light entering the pupil. Iris controls the
pupil.
Lens
The lens is a biconvex, transparent structure present in the eye behind
the pupil. The lens along with the cornea refracts the light, so as to
focus it on the retina. By changing its shape, the lens is capable of
changing the focal distance of the eye.
Retina
