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Which type of lens is present to correct the defect of long sightdness?
Wiki User
∙ 12y ago
Farsightedness is corrected using a concave type lens.
Wiki User
∙ 12y ago
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Which lenses should be used to correct the defect of astigmatism?
Cylindrical lens
The far point of myopia person is 85 cms in front of the eyes what is nature and power of the lens required to correct the vision?
The defect the person suffers from is myopia. 1/f=1/u+1/v 1/f=1/-85-1/infinity f=-85 cm =-0.85 m The power of the lens=1/f =1/-0.85 =-1.176 D Concave lens have negative focal length and are used for myopia. Thus the the lens that should be used to correct this defect is a concave lens of -1.176 D.
What defect of an eye can be corrected by using a cylindrical lens?
Astigmatism
When the image of an object is brought into focus in front of a person's retina the defect is called?
Lens
What does cylinder measure in eye exams?
cornea. there is lens - spherical and cornea - cylindrical normally and has a flat surface, but if it's not so in aspecific angle it will blur vision (astigmatism) now we can check if there is such a defect and correct it by eyeglasses
What Progressive eye defect resulting in difficulty focusing and caused by loss of elasticity in the lens?
Hemianopia Presbyopia
Lens used for shortsightedness?
One uses a divergent lens to correct for shortsightedness.
What type of lens is needed to correct hypermetropia?
Converging lenses....or....convex lens.
What is a sentence for concave lens?
A Concave lens is used to correct short- sightedness.
What lens can correct a myopia?
Diverging Lens are use (reading glasses) to help correct the problem of myopia helping fix the focus which causes items far away to seem fuzy and blurry.
How does a concave lens correct nearsightedness?
The eye lens may become too thick & its focal length is reduced. the ciliary muscles are not able to relax sufficiently to make the eye lens thin when viewing distant objects. So, they are unable to increase the focal length of the lens & the image is formed before retina. Since short sightedness occurs due to excessive convergence of light rays by the eye lens, it can be corrected by using a diverging lens, i.e, a concave lens. A properly chosen focal length of a concave lens compensates the extra convergence of the eye lens thus, removing the defect. The scientific name of short sightedness is myopia.
When the image of a distant object is brought into focus in front a a persons retina the defect is called?
The image of a distant object is brought into focus in front of a person's retina, the defect is called nearsightedness. A virtual image produced by a lens is always located in front of the lens.
