How to the human eye works and its defects

Eye Picture

Eye problems cause us to blur when we look at or read something. This is why we usually use glasses or contact lenses with the advice of a doctor. As a cause of blurred vision in the eyes we hear the focus point of the eye moves forward or backward. This is why the focus point of the eye is fixed using glasses. But do you ever think the question arises, what actually happens when these focus points move forward or backward?

Before we say anything about this, we need to have a light idea of ​​how these eyes work. (If two birds die in one fell swoop – because the system of seeing with the naked eye will also be known.)

Our eyes can only distinguish the presence or absence of light. When light from an object falls on our eyes, that parallel ray of light passes through the cornea (black king) of the eye, passes through the lens of the eye, and is bent at different angles and bends in different directions. Through the lens this bent light ray again converges at a certain point on the retina of the eye and focuses there creating an inverted reflection of the object.

One thing to keep in mind here is that if light does not come to our eyes from any object but we cannot see, and this is why we cannot see at all in the dark.

The retina has two sensory cells – rods and angles. Retinal angles help to understand cell color and rods help to see in low light. These rods and angle cells convert photons of light into electrical signals, which then travel through the optic nerve to our brain. This electrical signal is interpreted in the brain and becomes the opposite image and that is what we see. And this process happens very fast, which we do not understand.

The ability of the retina to focus light also depends on the shape of the rod and the angle cell. When we look at something, the extrinsic muscles attached to the lens contract and expand, changing the shape of the lens. This causes the object to remain fixed at the focal point in the retina even when we move the eye, so that the position of the object does not change. And this work is controlled by our nervous system.

(Not to mention that the different colored objects we see are made possible by the retina rods and angular cells of the eye one of the components of those rods and angular cells is vitamin A a lack of vitamin A causes night blindness.)

Now let’s get to the real thing. We usually have 4 types of vision problems due to the focus point moving forward or backward.

  • Myopia or myopia,
  • Hyperopia,
  • Astigmatism,
  • Presbyopia.

In the case of myopia or myopia, the focus point of our eye moves beyond the retina. As a result, distant objects can be seen blurred, but near objects can be seen. This is due to the fact that the size of the lens of the eye is much larger than normal or the focusing power of the lens is too much. In this case, using a convex lens, the focus point is pushed back and brought to the retina.

In the case of hyperopia or farsightedness, the focus point of our eye moves to the back of the retina. This makes it easier to see distant objects, but we see nearer objects blurred. This happens when the size of the lens becomes smaller than normal or if the focusing power of the lens is too low. In this case, using a concave lens, the focus point is pushed forward and brought to the retina.

Now the size of the lens can be small or large for various reasons. Notice that the lens of our eyes becomes much smaller in excessive light or dim light. When I get angry again, the lens of the eye becomes much bigger than usual. It is good to know that the only organ of the human body is the eye, which can be ten times larger than normal.

Moreover, when the iris of the eye expands, the pupil becomes smaller. The pupil becomes larger when the Irish is compressed again. This is right in front of the pupil lens. It controls the focusing power of our eyes. So even if it is a loss, there is a difference in focusing power. Also human eye colors like black, brown, blue – these are basically Irish colors.

In the case of astigmatism, when the shape of the cornea or lens is distorted, light comes to the two focus points in front and behind the retina. This can lead to blurred vision, blurred vision and headaches.

In the case of presbyopia, age changes the cornea of ​​the eye and the elasticity of the lens due to age-related structural changes in the eye, resulting in reduced ability of the lens to resize as needed (especially to see near objects) and nearby objects appear blurred.

I said a lot about eyes. Here are some tips for free:

  • Should not stay in high light or low light for long. Because in that case there is a lot of pressure on the eyes.
  • Many people have the habit of washing their eyes repeatedly But that’s not right Because by washing the eyes repeatedly, the necessary elements of the tears are also washed As a result, the resistance to eye diseases decreases.
  • Eat fresh colorful vegetables, fruits and eggs, milk rich in vitamin A.
  • If something falls on the eyes, it should not be rubbed at all 6 should be washed with water.
  • If there is any kind of injury in the eyes, the eyes should be washed with cold water Eye injuries can be fatal So take the advice of a doctor without delay.
  • If you have diabetes, you must show your eyes with sugar control Because diabetes causes severe damage to the eyes.

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