What is presbyopia ? State its cause. How is it corrected ?
(b) Why does the Sun appear reddish early in the morning ? Explain with the help
of a labelled diagram.
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Answered by
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Presbyopia is an age-related condition that causes blurred near vision. It typically starts at around age 40 and affects everyone, even those who've never had vision problems before.
For centuries presbyopia was corrected with the use of bifocal eyeglasses. Today there are many ways to correct presbyopia with eyeglasses, contact lensesand surgery.
For centuries presbyopia was corrected with the use of bifocal eyeglasses. Today there are many ways to correct presbyopia with eyeglasses, contact lensesand surgery.
Answered by
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a>Presbyopia is a defect of eye which happens at old age in which the power of accomodation is reduced.
It causes due to-
•weakening of ciliary muscle.
•reduce in the flexiblity of eye lens.
It is corrected using bifocal lens which is concave at the top and convex at the down.
b> In early morning the sun is at the horizon so the light rays of the sun has to pass through the thick layer of atmosphere and it has to cover larger distance. Durning its course the all small wavelength light rays scatters and only the large wavelength enters the eye ie. red.
MARK IT AS BRAINLIEST PLEASE.
It causes due to-
•weakening of ciliary muscle.
•reduce in the flexiblity of eye lens.
It is corrected using bifocal lens which is concave at the top and convex at the down.
b> In early morning the sun is at the horizon so the light rays of the sun has to pass through the thick layer of atmosphere and it has to cover larger distance. Durning its course the all small wavelength light rays scatters and only the large wavelength enters the eye ie. red.
MARK IT AS BRAINLIEST PLEASE.
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