Describe about human eye and how it is working., Biology

The human eye is an organ which reacts to light for various purposes. As a conscious sense organ, the mammalian eye permits vision. Cone and Rod 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.
In common with the eyes of other mammals, the human eye''s non-image-forming photosensitive ganglion cells in the retina receive the light signals which affect adjustment of the size of the pupil, regulation and suppression of the hormone melatonin  and entrainment of the body clock.

Working of eye
The light coming from an object enters the eye through pupil and cornea. The eye lens converges these light rays to form a inverted, real and diminished image on the retina. The light sensitive cells of the retina gets activated with the incidence of light and make electric signals. These electric signals are sent to the brain by the optic nerves and the brain interprets the electrical signals in such away that we see an image which is erect and of the similar size as the object. Before we go into the defects of vision let us be familiar with the terminology used by the ophthalmologists like least distance of distinct vision, far point and power of accommodation of the eye.

Posted Date: 3/8/2013 8:17:32 AM | Location : United States

Related Discussions:- Describe about human eye and how it is working., Assignment Help, Ask Question on Describe about human eye and how it is working., Get Answer, Expert's Help, Describe about human eye and how it is working. Discussions

Write discussion on Describe about human eye and how it is working.
Your posts are moderated
Related Questions
Q. Why doesn't the food enter the trachea instead of going to the esophagus? When food is swallowed the swallow reflex is activated and the larynx closes and elevates to avoid

Name the system that contains three neurons Consider a system that contains three neurons in a culture dish bathed in normal physiological saline.  All three neurons are health

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

what are the organs of respiration in the lower form of animals?

steps in urine formation and the organs/tissues involve in such process?

Define Tips that should be followed before an event Start? Before the event, following tips should be followed:   As the glycogen stores may be used up during night, a h

Explain ISP The specification of the Association of American Feed Control Officials, Inc. (AAFCO) defines ISP as "Major proteinaceous fraction of soybeans prepared from dehulle

Explain the differences between a thrombus and an embolus. Include predisposing factors, mechanism of occurrence, treatment, and methods of detection with medical imaging, if any.

Somatic Embryogenesis The process of embryo development is called embryogenesis. It is not the monopoly of the egg to form an embryo. Any cell of the female gametophyte (Embr

Various acute complications of diabetes mellitus are described in this unit. Acute complications develop within a short period of time. These are due to improper treatment of diabe