The human eye is the gateway to one of the five senses. The human eye is an organ which responds to light. Allows the perception of light, color vision and depth perception. A normal human eye can see about 10 million different colors! There are many parts of the human eye, and that is what we are discussing in this atom.
The eye and functions
Contrary to popular belief, the human eye is not a perfect sphere, but consists of two different parts, the cornea and the sclera. The two parts are connected by a ring called limbo. Part of eyes looking at is the iris which is the colored part of eye.In the center of the iris is the pupil, the black point, resize. Corneal these elements, nor transparent. The fund is in contrast to the students, but in the eyes and can not be seen without special instruments. The optic nerve is the eye transmit signals to the brain. It is the eye diagram. The human eye is composed of three layers:
Diagram of the human eye
The eye of the cornea and lens interacts to form a real image on the light sensitive has the highest concentration of receptors in the fovea and the blind spot at the tip of the optic nerve retina. The lens strength can be adjusted to provide an image on the retina of objects at different distances. here.However shows the network layers with different refractive indices of the lens, which have been omitted in the other drawings.
The outermost layer – consisting of the cornea and sclera.
The middle class – made up of the choroid, ciliary body and iris.
Deeper layer – the retina, which can be seen with an instrument called an ophthalmoscope.
Once (it is the clear liquid in the front chamber and the rear chamber) in three shifts, without the aqueous humor, the vitreous (clear jelly that is much larger than the aqueous humor) and a soft lens. All are connected by students.
Whenever the eyes move even a little exposure is automatically reset by controlling the diaphragm, which regulates the size of the pupil. This is what helps your eyes adjust to the dark or the lights are very bright. Lens of the eye is similar to that. In glasses or camera The human eye has an aperture such as a camera. Disciples have this feature, and the iris diaphragm. The different parts of the eye have different refractive indices, which is what prevents the light to form an image. Corneal provide two-thirds of the power of the eye. The lens provides the remaining power. Figure spent several layers of the eye, but it happened in a way that is very similar to a convex lens. If the image is Retena finally reached it was repealed, but the brain will solve this problem. It shows what happens.
A retina image formed by the light rays converge on the cornea and the lens and. The rays of the top and bottom of the object can be searched and invested generate real image on the retina. The distance of the object becomes smaller scale.
Each eye has six muscles; right, right, right side down, top right, bottom oblique and the superior oblique. These muscles provide differnt voltage and torque to control the movement of the eye. These are just some examples of the types of eye movements:
- Rapid Eye Movement – is often referred to as REM, this occurs at the stage of sleep when dreams are most evident.
- jerks – This is a fast time of movement of both eyes simultaneously, and is controlled by the frontal lobe of the brain.
- vestibuloocular Reflex – This is the opposite of eye movements with head movements and take the research object in the visual center.
- The Pursuit movement – this movement followed if you follow a moving object. It is less accurate than the vestibular-ocular reflex.