You Need Spectacles – Why?
Here is some information about some of the routine eye problems which may result in you having to need prescription specs
Myopia – Also known as short sightedness, near sightedness
Nearsighted people generally see fine up close, but not at a distance. Distant objects appear blurred, whilst close objects are in focus.
DESCRIPTION
The eyeball is longer than usual, making the eye "too powerful." The image is focused at a point in front of the retina. The higher the degree of myopia, the shorter the point at which the Nearsighted can see clearly.
SOLUTION
Myopia can be corrected with the use of a concave lens system which is thin in the centre and thick at the edge. This type of lens system pushes the focal point 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 a lot better at a distance compared with close up. Even though distant objects appear properly focused, the accommodation required to focus on near objects causes eyestrain.
DESCRIPTION
The eye ball 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 with a convex lens that is thin at the border and thick in the center. This type of lens brings the focus forward to the retina.
ASTIGMATISM
People with astigmatism have poor close and distant vision. They do not comprehend the contrasts between horizontal, vertical and diagonal lines in the same way as the rest of us.
Astigmatism is always accompanied by another visual impairment, such as Myopia, hyperopia and Presbyopia.
DESCRIPTION
Astigmatism is typically caused by an irregularly-shaped cornea which is slightly oval, instead of round, and oblong rather than spherical.
SOLUTION
Astigmatism can be corrected with a cylindrical lens system whose curvature offsets the corneal irregularity.
