My OperaEYE DISEASES
Wednesday, April 7, 2010 3:18:41 PM
ASTIGMATISM
Astigmatism is a refractive error where distant object comes into two focal lines perpendicular to one another. These lines may lie in any orientation and any position in relation to the retina. This is primarily due to the aspherical (toroidal) corneal shape.
A bent lens with a toric surface is used to correct this condition.
Astigmatism may occur by itself or may occur with one of the refractive errors but in most cases are less than 2.50 dioptres. Although for a similar degree of defect, astigmatic eyes suffer less blurness than the other refractive errors, uncorrected astigmatism often leads to eyestrain and headache due to the focal lines formed in the eye cause the eye's focusing mechanism under strain as it constantly exert effort for best possible focus.
Uncorrected astigmatism on young children can also lead to Amblyopia.
MYOPIA
Myopia (Nearsightedness) is a refractive error where distant object comes into focus in front of the retina of the eye as a result of longer than normal eye-ball, so the distant object appears blur to the myopic eye.
A bent concave lens is used to bring the focus on the retina to restore clear distance vision.
However, the myopic eye can still see near objects clearly without any correction depending on the distance of the near objects in relation to the degree of myopia.
It's important to detect and correct young children (under 6 years old) with moderate to high monocular myopia to prevent Amblyopia (lazy eye).
Astigmatism is a refractive error where distant object comes into two focal lines perpendicular to one another. These lines may lie in any orientation and any position in relation to the retina. This is primarily due to the aspherical (toroidal) corneal shape.
A bent lens with a toric surface is used to correct this condition.
Astigmatism may occur by itself or may occur with one of the refractive errors but in most cases are less than 2.50 dioptres. Although for a similar degree of defect, astigmatic eyes suffer less blurness than the other refractive errors, uncorrected astigmatism often leads to eyestrain and headache due to the focal lines formed in the eye cause the eye's focusing mechanism under strain as it constantly exert effort for best possible focus.
Uncorrected astigmatism on young children can also lead to Amblyopia.
MYOPIA
Myopia (Nearsightedness) is a refractive error where distant object comes into focus in front of the retina of the eye as a result of longer than normal eye-ball, so the distant object appears blur to the myopic eye.
A bent concave lens is used to bring the focus on the retina to restore clear distance vision.
However, the myopic eye can still see near objects clearly without any correction depending on the distance of the near objects in relation to the degree of myopia.
It's important to detect and correct young children (under 6 years old) with moderate to high monocular myopia to prevent Amblyopia (lazy eye).
