Which defect of vision can be rectified by
a) by using a concave lens
b) by using a convex lens
a) by using a concave lens
b) by using a convex lens
(a). by using a concave lens
Myopia
This is a defect of vision in which far objects appear
blurred but near objects are seen clearly. The image is focused in front of the
retina rather than on it usually because the eyeball is too long or the
refractive power of the eye’s lens too strong. Myopia can be corrected by
wearing glasses with concave lenses these help to focus the image on
the retina.
(b). by using convex lens
Hyperopia
This is a defect of vision in which there is difficulty with near vision but far objects can be seen easily. The image is focused behind the retina rather than upon it. This occurs when the eyeball is too short or the refractive power of the lens is too weak. Hyperopia can be corrected by wearing glasses that contain convex lenses
(a). by using a concave lens
Myopia
This is a defect of vision in which far objects appear blurred but near objects are seen clearly. The image is focused in front of the retina rather than on it usually because the eyeball is too long or the refractive power of the eye’s lens too strong. Myopia can be corrected by wearing glasses with concave lenses these help to focus the image on the retina.
(b). by using convex lens
Hyperopia
This is a defect of vision in which there is difficulty with near vision but far objects can be seen easily. The image is focused behind the retina rather than upon it. This occurs when the eyeball is too short or the refractive power of the lens is too weak. Hyperopia can be corrected by wearing glasses that contain convex lenses
