The eye is the organ of sight and is shaped as a slightly irregular hollow sphere. Various structures in the eye enable it to translate light into recognizable images. Among these are the cornea, the lens, and the retina.
Light first passes through the cornea, a clear dome-like structure covering the iris, or colored part, of the eye. The cornea bends, or refracts, the light onto the lens. The light is then refracted a second time while passing through the lens, finally focusing on the retina. The retina is the light sensitive part of the eye. Impulses travel down the optic nerve to the occipital lobe of the brain, which then interprets the image in the correct perspective.
The shape of the eye is very important in keeping the things we see in focus. If the shape of the eye changes, it affects a person's vision.
Normally, light is precisely focused onto the retina at a location called the focal point. A nearsighted eye is longer from front to back than a normal eye causing light to be focused in front of the retina instead of directly onto it. This makes it difficult to see objects that are far away. Glasses with concave lenses are used to correct nearsightedness. The concave lens focuses light back onto the focal point of the retina.
Farsightedness occurs when the length of the eye is too short. Light is focused at a point behind the retina, making it difficult to see objects that are up close. A convex lens is used to correct farsightedness because it directs the focal point back onto the retina.
Reviewed ByReview Date: 11/17/2010
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc
The lights are out.
vision
I believe you are seeing an airplane.
Perspective
About 15%
the eyes is seeing
Eyes are used for seeing.
Seeing I was created in 1998.
Be Seeing You was created in 1977.
The progressive form of "see" is "seeing."
"am seeing", or "is seeing", or "are seeing"
We can look for it by using these tecniqes. •Seeing it in rocks (meteorites) •Seeing it gravitationally •Seeing it spectroscopically (remote sensing) •Seeing morphological features of it (remote sensing) •Seeing it (remote sensing)
yes he is seeing it
The phrase, 'Seeing is Believing' is an expression that simply says you don't believe it until you see it. The phrase 'Believing is Seeing' means that believing is like seeing. If you don't believe in Santa, or 'Seeing is Believing, you won't believe it until you see him. If you do believe in him, 'Believing is Seeing', then it is like seeing him because you do believe.
The best seeing animal is the hawk.
A School House
He is seeing Miley Cyrus!!