Parts of Human Eye : Retina (GA _JHE06A)


the last part of human eye at the end of eyeball
that we call retina. and we already studied in the beginning that it is. a delicate. membrane.
at the inside surface, of rear point of eyeball. this is the last part of eyeball. and. it
acts. as a screen. where the image is produced. image of object we are looking at it is produced
by eye lens. and on this delicate membrane which we call retina or the screen of our
human eye. the important fact is for sensation of vision. retina consist of. millions of
light sensitive cells. calls. these are called. rods. and cones. here you can see this is
the picture of internal structure of a human eye. and, the rear part of, this eyeball we
call retina. on which the image is produced by the eye lens. now if we zoom into, this
retina membrane we can see. at microscopic view there lot of cells. some of which are
rod shaped and some of which are conical shaped. and when light falls on these cells. these
are photosensitive cells. in which electrical impulses are generated due to. the light when
it falls onto it and these impulses are carried to the brain, and we are able to see the image.
about rod shaped cells we can write these rods are. these are rod shaped cells. which
respond to. brightness of light. the cells are sensitive for brightness of light and
we can say these are active. in bright. as well as. in dim light conditions. because,
our eyes senses that the light conditions are bright or dim because of these cells so
which senses the brightness or intensity of light. when we talk about cone shaped cells
or which are called cones we can write these are. cone shaped cells. which respond to.
colors in light. and we know well that we can see colors only when, sufficient brightness
is there in darkness we can not see colors, so here we can write these respond to colors
and light and. are only active. in bright light conditions. so that colors can be seen.
in dim light or dark zones cone cells are not activated. so we can only sense the perception
of, objects and darkness rather then there color property.

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