Different between myopia and hypermetropia .
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Answers
Answer:
The difference between myopia and hypermetropia is that a myopic person is only able to see the near or short distance objects clearly whereas a hypermetropic person is only able to see the far or distant objects clearly.
Answer:
Myopia :
It also refers to “Nearsightedness”. It is a refractive error by which a person can only see the nearby objects clearly but the visibility to the distant object is not clear.
In a myopic eye, the image forms in front of the retina.
The correction of myopia is through the concave lens (diverging lens) which has a negative refractive power which increases with the severity of myopia.
Based on the refractive error, myopia classify into the following three types:
Low
Moderate
High
Classification of myopia:
Low myopia:
In this, the refractive error is ≥ -3.00 D.
Moderate myopia:
In this, refractive error is ˂ -3.00 to -6.00 D.
High myopia:
In this, refractive error is ˂ -6.00 D.
Hypermetropia :
It also refers to “Farsightedness”. It is a refractive error by which a person can only see the far objects clearly but the visibility to the near object is not clear.
In the hypermetropic eye, the image forms behind the retina.
the correction of hypermetropia is through the convex lens (converging lens) which has a positive refractive power which also increases with the severity of hypermetropia.
Based on the refractive error, myopia classify into the following three types:
Low
Moderate
High
Classification of hypermetropia
Low hypermetropia:
In this, the refractive error is ≥ +2.00 D.
Moderate hypermetropia:
In this, refractive error is ˂ +2.00 to +5.00 D.
High hypermetropia:
In this, refractive error is ˂ +5.00 D.
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