what is an eye explain with it's different parts
Answers
Key points
Visual acuity (VA) is defined as the clarity of the image seen by the eye. Visual acuity is measured using an eye chart at a distance of 20 feet away.
20/20 vision does not mean perfect vision. It is normal, average vision.
Visual field (VF) is a term used to describe how far you can see to the side. A normal visual field is 180 degrees, which is a half-circle.
The term "legally blind" means different things in different provinces and states. Ask your optometrist or ophthalmologist what "legally blind" means in your province or state. This way, you can find out if your child is able to drive, is eligible for an assistive devices program or other benefits.
The anatomy of the eye
The eye has many parts that must work together to produce clear vision:
The sclera, or white part of the eye, protects the eyeball.
The pupil, or black dot at the centre of the eye, is an opening through which light can enter the eye.
The iris, or coloured part of the eye, surrounds the pupil. It controls how much light enters the eye by changing the size of the pupil.
The cornea, a clear window at the front of the eye, covers the iris and the pupil.
A clear lens, located behind the pupil, acts like a camera lens by focusing light onto the retina at the back of the eye.
The retina is a light-sensitive inner lining at the back of the eye. Ten different layers of cells work together in the retina to detect light and turn it into electrical impulses.
Answer:
eye is a sensitive organ