Catching Up With Online Business

Here is some information dealing with some of the everyday eye problems which may cause you to need prescription eyeglasses

Myopia - Short sightedness, near sightedness

Nearsighted people can view well up close, but not at a distance. Distant objects appear blurred, while near objects are in focus.

DESCRIPTION

The eye ball is longer than usual, making the eye "too powerful." The image is focused at a point in front of the retina. The greater the degree of myopia, the shorter the point at which the Shortsighted can visualise clearly.

SOLUTION

Myopia can be corrected with the use of a concave lens that is thin in the centre and thick at the boundary. This type of lens pushes the focus back onto the retina and restores good vision at any distance.

HYPEROPIA - May be known by the terms long sightedness, far sightedness

Farsighted people view far better at a distance than close up. Although distant objects are properly focused, the accommodation required to focus on close objects causes eyestrain.

DESCRIPTION

The eyeball is shorter than normal which means the eye is not powerful enough. The eye is said to be "too short" and the image is focused behind the retina.

SOLUTION

Hyperopia is corrected using a convex lens system which is thin at the edge and thick in the center. This type of lens system brings the focus forward to the retina.

ASTIGMATISM

People with astigmatism have poor near and distant vision. They do not perceive the contrasts between horizontal, vertical and diagonal lines in the same style as the rest of us.

Astigmatism is always accompanied by another visual impairment, such as Myopia, hyperopia and Presbyopia.

DESCRIPTION

Astigmatism is commonly a result of an irregularly-shaped cornea which is slightly oval, rather than round, and oblong instead of spherical.

SOLUTION

Astigmatism can usually be corrected using a cylindrical lens whose curvature offsets the corneal irregularity.