Initially, I wanted sharing some of the common vision problems, their causes, and all there is to know about them
But then…it 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.
𝐓𝐡𝐞 𝐁𝐚𝐬𝐢𝐜 𝐒𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞𝐬 𝐨𝐟 𝐭𝐡𝐞 𝐄𝐲𝐞𝐬
Before we get into the process of image formation, let's get to know some of the basic structures of the eye.
They include:
𝐂𝐨𝐫𝐧𝐞𝐚: the transparent outer layer of the eye, responsible for refracting (bending) light.
𝐈𝐫𝐢𝐬: this is the colored part of the eye that controls the amount of light entering the eye by adjusting the size of the pupil.
𝐏𝐮𝐩𝐢𝐥: - The opening in the center of the iris(that small black hole) that regulates the amount of light entering the eye
𝐋𝐞𝐧𝐬:this is a flexible, transparent structure behind the iris that changes shape(by stretching or relaxing) to focus light on the retina.
𝐑𝐞𝐭𝐢𝐧𝐚: This is a light-sensitive layer of tissue at the back of the eye)
𝐍𝐨𝐰 𝐓𝐡𝐞 𝐏𝐫𝐨𝐜𝐞𝐬𝐬 𝐨𝐟 𝐢𝐦𝐚𝐠𝐞 𝐟𝐨𝐫𝐦𝐚𝐭𝐢𝐨𝐧 𝐩𝐫𝐨𝐩𝐞𝐫
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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