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2. Astigmatism.
This type of refractive error results from uneven curvature of the cornea — instead of curving equally in all directions. The cornea is shaped somewhat like the bowl of a spoon. Read more…
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Two foci, thus, occur instead of one and, as a consequence, the patient is unable to focus horizontal and vertical rays on the retina at the same time. These defects may be corrected with lenses called “cylinder lenses.” Considering these few examples of refractive errors, external and internal examination of the eye must be applied first before the eye doctor can prescribe the right form of vision correction.
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Indeed, vision correction may range from simple to most complicated form of treatment. Whatever the condition is, it is always worthy to remember that in order to avoid any probable vision correction, it is important to know the various steps in caring for the eyes. The eyeball is a spherical organ situated in a bony cavity called the orbit. The muscles are located not only on each side of the eye, but also on the top and the bottom of the eye.
Based on this primary description of the anatomy of the eye, it can be deduced that the eye is such a highly sensitive organ that proper attention and safeguard must be taken into consideration.
