Focusing Disorders
The human eye is an amazing
organ. It behaves a bit like a camera, focusing light on to the retina
and so allowing us to see our world clearly. It is amazing how often
nature gets it right, but sometimes things can go wrong and we need
some help from the optometrist to see the world more clearly. Below is
a list of the more common focusing disorder we encounter. There is
brief description with a link that takes you to the OAA website that offers a
more detailed explanation.
Myopia (shortsightedness) describes a condition where long distance objects are not seen clearly. It is a result of the eyeball being too long for the eye's optical system. Myopic people wear their glasses to drive, watch TV and general long distance viewing. Depending on the amount of myopia some people may choose to wear their glasses all the time. Contact lenses can also be used to correct myopia. Read more..
Hyperopia (longsightedness) describes a condition where near objects are not seen clearly. It is a result of the eyeball being too short for the eye's optical system. Hyperopia affects people differently depending on age. Younger mild hyperopes may only need glasses occasionally to read, where as older hyperopes may wear their glasses all of the times. Contact lenses can also be used to correct hyperopia. Read more..
Astigmatism refers to a focusing disorder that is usually caused by an "oval" shaped cornea. This means the cornea (clear window over the iris) is shaped like a football rather than a basketball. People with astigmatism will experience blurry vision at both close and far distances and may wear their glasses just sometimes or all of the time; astigmatism is also correctable with contact lenses.
Read more..
Presbyopia is a condition that will eventually affect everybody. It happens usually in the mid 40's and results in blurry near vision. It is caused by a natural inflexibility of the crystalline human lens inside the eye. If you haven't been a previous spectacle wearer this is usually when you start.
Read more..
Myopia (shortsightedness) describes a condition where long distance objects are not seen clearly. It is a result of the eyeball being too long for the eye's optical system. Myopic people wear their glasses to drive, watch TV and general long distance viewing. Depending on the amount of myopia some people may choose to wear their glasses all the time. Contact lenses can also be used to correct myopia. Read more..
Hyperopia (longsightedness) describes a condition where near objects are not seen clearly. It is a result of the eyeball being too short for the eye's optical system. Hyperopia affects people differently depending on age. Younger mild hyperopes may only need glasses occasionally to read, where as older hyperopes may wear their glasses all of the times. Contact lenses can also be used to correct hyperopia. Read more..
Astigmatism refers to a focusing disorder that is usually caused by an "oval" shaped cornea. This means the cornea (clear window over the iris) is shaped like a football rather than a basketball. People with astigmatism will experience blurry vision at both close and far distances and may wear their glasses just sometimes or all of the time; astigmatism is also correctable with contact lenses.
Read more..
Presbyopia is a condition that will eventually affect everybody. It happens usually in the mid 40's and results in blurry near vision. It is caused by a natural inflexibility of the crystalline human lens inside the eye. If you haven't been a previous spectacle wearer this is usually when you start.
Read more..
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