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When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?
Myopia:
The causes myopia, also known as .
can be seen clearly with this defect, but cannot. The distance between the retina and the eye lens is , or the focal length of the eye lens is . As a result, the far point will no longer be infinity for such eyes, and the far point will have moved closer. Due to this, the image of distant objects is formed .
Correction of Myopia:
A of suitable power can be used for the correction of myopia. The lens will bring the image back on to the retina.
Hypermetropia:
The causes hypermetropia, also known as .
can be seen clearly, but cannot be seen clearly due to this defect. The distance between the eye lens and the retina is , or the focal length of the eye lens is . As a result, the near point for such eyes will no longer be at \(25\ cm\), and the near point will have moved further. Due to this, the image of nearby objects is formed .
Correction of Hypermetropia:
of suitable power can be used for the correction of hypermetropia. It provide additional focusing power which is required for bringing the image back on the retina.
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