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Vision, liens : https://kidshealth.org/en/kids/eyes.html https://www…
Vision
Light 
The electromagnetic waves your eyes detect – visible light – oscillate between 400 and 790 terahertz (THz). That’s several hundred trillion times a second. The wavelengths are roughly the size of a large virus: 390 – 750 nanometers. Our brain interprets the various wavelengths of light as different colors. Red has the longest wavelength, and violet the shortest.
Seeing / Eyes
Problems with vision
Eye diseases
Age-related macular degeneration: This disease affects an area in the middle part of the retina called macula. It causes blurring or loss of vision in the center of your eyesight which is needed for activities, such as reading and driving.
Diabetic retinopathy: High blood sugar levels caused by diabetes damage the blood vessels of the retina.
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Refractive errors
Astigmatism: An uneven and curved cornea, instead of being round and smooth. This causes distorted vision for both near and far objects.
Myopia: This condition may cause you to clearly see objects up close but not those from afar. Myopia happens when the eye is longer and more oval than normal. This causes the light to be focused in front of the retina instead of on it.
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Other vision problems
Color blindness: the inability to see or differentiate some or all colors. Color blindness may run in families or as a result of injury to the eye, nerve, or brain.
Low vision: Normal vision cannot be achieved even with the use of corrective glasses or contact lenses. Daily activities are limited because of the poor vision. Visual aids, such as magnifying glasses, or devices, such as talking watches may help people with low vision.
Legal blindness: Aperson has either a very poor visual acuity or a very small field of vision. Visual acuity measures how clear or sharp one's vision is. Legal blindness also includes those whose field of vision in the better eye is limited to 20 degrees.
Definition : Vision is the ability to see. To have vision, you need light and the use of your eyes and brain. The eye is made of different parts that work together. They take the image reflected by light, focus it properly, and then send this message to the brain.
Diffraction
involves a change in direction of waves as they pass through an opening or around a barrier in their path
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