Initially, I wanted sharing some of the common vision problems, their causes, and all there is to know about them
But thenโฆit struck me! For you to completely grasp how these visual problems occur, you need to understand how images are formed in the eyes.
Let's get on to it shall we.
๐๐ก๐ ๐๐๐ฌ๐ข๐ ๐๐ญ๐ซ๐ฎ๐๐ญ๐ฎ๐ซ๐๐ฌ ๐จ๐ ๐ญ๐ก๐ ๐๐ฒ๐๐ฌ
Before we get into the process of image formation, let's get to know some of the basic structures of the eye.
They include:
๐๐จ๐ซ๐ง๐๐: the transparent outer layer of the eye, responsible for refracting (bending) light.
๐๐ซ๐ข๐ฌ: this is the colored part of the eye that controls the amount of light entering the eye by adjusting the size of the pupil.
๐๐ฎ๐ฉ๐ข๐ฅ: - The opening in the center of the iris(that small black hole) that regulates the amount of light entering the eye
๐๐๐ง๐ฌ:this is a flexible, transparent structure behind the iris that changes shape(by stretching or relaxing) to focus light on the retina.
๐๐๐ญ๐ข๐ง๐: This is a light-sensitive layer of tissue at the back of the eye)
๐๐จ๐ฐ ๐๐ก๐ ๐๐ซ๐จ๐๐๐ฌ๐ฌ ๐จ๐ ๐ข๐ฆ๐๐ ๐ ๐๐จ๐ซ๐ฆ๐๐ญ๐ข๐จ๐ง ๐ฉ๐ซ๐จ๐ฉ๐๐ซ
When looking at an object, light is reflected from it into our eyes, hence enabling us to see
Light enters through the cornea, which acts like a window at the front of the eye.
The amount of light entering the eye is then controlled by the pupil, which is surrounded by the iris(coloured part of the eye).
The pupil changes size according to how much light is present; it is smaller in bright light and becomes larger when there is less light.
- Next, light passes through the lens. The lens works together with the cornea to bend light so it is focused correctly on the retina.
When light hits the retina, special cells called photoreceptors turn the light into electrical signals.
These electrical signals travel from the retina to the brain. Then the brain turns the signals into the images you see.
That's just about it.
If this doesn't make sense now, don't worry. It will as we get to discuss the common eye defects around
On Wednesday, we'll talk on Nearsightedness (myopia)
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