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What is the depressed area in the retina that is the point of the clearest vision?
Wiki User
∙ 12y ago
the fovea centralis is the point of clearest vision
Wiki User
∙ 12y ago
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Compare nearsightedness and farsightedness in terms of defects?
In nearsightedness, the eyeball is elongated and the focal point thus falls short of the retina. This results in good vision for objects very close to the face, but poor vision at any significant distance (even beyond a few feet, for any level of nearsightedness. Conversely, in farsightedness, the focal point is never reached, before the retina. Thus, objects which are near cannot be seen clearly. However, distance sight is preserved.
The retina's point of central focus?
the fovea.
Is Optic chiasm the blind spot of eye?
No. The blind spot in the eye is the optic disc, the point where the optic nerve meets the retina. At this point, there are no photoreceptors, so no detection of vision. The optic chiasm is the place near the brain where the optic nerves cross over.
What region of the retina produces the sharpest image?
It actually depends on the lens. For the image to be sharp on the retina, all the rays of light coming off the object must meet together at the same point on the retina. If the rays of light meet somewhere in front of the retina, the lens focuses by stretching itself and becoming thinner. This spreads out the rays of light, making them go further into the eye until they reach the middle of the retina. If the rays of light are behind the retina, the lens thickens to focus.
Why is convex lens used for myopia?
Convex lenses cause the focal point to appear behind the lens (positive convergence). In myopia, the focal point lies somewhere between the lens and the retina, it needs to converge at a point farther than it is converging, this is why a convex lens is used, to push the focal point back so it will hit the retina. A concave lens would do the opposite for hyperopia (the focal point appears behind the retina), it will adjust the focal point to lie more anteriorly and land on the retina.
How would you describe a nearsighted person?
The focal point is in front of the retina
How would you describe a nearsighted person's eye?
A nearsighted person's eye is typically longer than average or has a cornea that is too steep. This causes light entering the eye to focus in front of the retina instead of directly on it, resulting in blurry distance vision. Nearsightedness can be corrected with glasses, contact lenses, or refractive surgery.
What is the exit point of neurons from the retina of the eyeball has no rods or cones What is this exit point called?
The blind spot
If Jane is myopic. Will she need concave or convex lenses explain?
Concave. With myopia, the focal point of the eye is in front of the retina. Concave lenses increase the distance of the focal point so that it lies on the surface of the retina.
Where is the image in the eye focused onto?
The most neuron focused point in the eye is the fovea centralis or more simply, fovea. This is the are most responsible for sharp central vision. About 50% of the optic nerve endings are from the brina to this area in the eye.
What are the release dates for Vision Point - 1999?
Vision Point - 1999 was released on: USA: February 1999 (Resfest)
What is the primary function of the lens of the eye?
The lens focuses the light on the retina. If your lenses are too short, the light is focused in front of the retina, making you nearsighted (myopic). If your lenses are too long, the focal point is past the retina, making you farsighted. Most people need reading glasses eventually, even if their eyesight has been perfect, because with age the lens loses flexibility, which means it cannot shorten to accomodate close vision, so glasses are needed to correct this.
