The human eye is an organ that reacts to light in many circumstances. As a conscious sense organ, the human eye allows vision; rod and cone cells in the retina allow conscious light perception and vision, including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.

1. Prepared by Atheena Pandian
Human Eye
BASICS OF BIOMEDICAL

2. Crucial
Talking
Points
DISCUSSION FLOW
Human Eye
POurpose
Parts
Function
1.
2.
3.
4.

3. Human Eye
THE HUMAN EYE IS AN ORGAN THAT REACTS
TO LIGHT AND ALLOWS VISION

4. The eye is an organ that detects light and
sends signals along the optic nerve to the
brain.

7. Sclera - The sclera is the white of the eye
The Cornea. The cornea is the clear bulging surface
in front of the eye
Anterior & Posterior Chambers. The anterior
chamber is between the cornea and
The iris - Iris/Pupil
Lens
Vitreous Humor
Retina
Optic Lobe
Optic Nerve
Parts of the Eye. Here I will briefly describe various
parts of the eye:
1.
2.
3.
4.
5.
6.
7.
8.
9.

8. The conjunctiva is the
clear, thin membrane
that covers part of the
front surface of the eye
and the inner surface of
the eyelids

10. The sclera is the white part of the eye that
surrounds the cornea. In fact, the sclera
forms more than 80 percent of the surface
area of the eyeball, extending from the
cornea all the way to the optic nerve, which
exits the back of the eye. Only a small portion
of the anterior sclera is visible.

11. The cornea allows light to enter the
eye for vision. Here are the basics you
should know about this important part
of the eye.

12. No, the uvea is not that little lobe of tissue that dangles from the back of your
mouth when your doctor tells you to open wide and say "Ahh!" That's your uvula.

13. One of the most important parts of the
eye isn't a structure at all — it's an open
space. It's the pupil of the eye.

15. The first step in the process of vision is the
conversion of light into signals that can be
interpreted in the brain. This takes place
in the retina, which is located in the back
of the eye.

16. The retina is the sensory
membrane that lines the inner
surface of the back of the
eyeball. It's composed of
several layers, including one
that contains specialized cells
called photoreceptors.

19. Rod photoreceptors detect motion, provide black-and-white
vision and function well in low light
Cones are responsible for central vision and color vision and
perform best in medium and bright light.Rods are located
throughout the retina
Cones are concentrated in a small central area of the retina
called the macula. At the center of the macula is a small
depression called the fovea
The fovea contains only cone photoreceptors and is the point
in the retina responsible for maximum visual acuity and color
vision.
There are two types of photoreceptor cells in the human eye —
rods and cones
1.
2.
3.
4.

21. Photoreceptor cells take light focused by
the cornea and lens and convert it into chemical and
nervous signals which are transported to visual
centers in the brain by way of the optic nerve.
In the visual cortex of the brain (which, ironically, is
located in the back of the brain), these signals are
converted into images and visual perceptions.
Function of Retina

22. GOOD LUCK