Single Choice

Match the list I with the List II for the combination shown Presbiopia Sphero-cylindrical lens Hypermetropia Convex lens of proper power may be used close to the eye Astigmatism Concave lens of suitable focal length Myopia Bifocal lens of suitable focal length

A$$I-A; II-C; III-B; IV-D$$
B$$I-B; II-D; III-C; IV-A$$
C$$I-D; II-B; III-A; IV-C$$
Correct Answer
D$$I-D; II-A; III-C; IV-B$$

Solution

Presbyopia is a medical condition at old ages accounting for the gradual loss of eyes' ability to focus on nearby objects. Bifocal lens (consisting of top and bottom lens) of suitable focal length are prescribed for adjusting the eye to focus at nearby objects(usually bottom lens) and distant objects(usually top lens). So $$I-D$$

Hypermetropia occurs when eye is unable to focus light rays from nearby objects at the retina. So Convex lens of proper power is used close to the eye for focusing the light rays at the retina.So $$II-B$$
Astigmatism occurs due to irregular curves in the eyeball so Sphero-cylindrical lenses are used for proper formation of image at the retina. So $$III-A$$

Myopia occurs when eye lens focus light rays from distant objects ahead of the retina. So external Concave lens of suitable focal length is used so that light rays from distant objects can be focused exactly at the retina. So $$IV-C$$

SIMILAR QUESTIONS

Optics

Does short-sightedness (myopia) or long-sightedness (hypermetropia) imply necessarily that the eye has partially lost its ability of accommodation? If not, what might cause these defects of vision?

Optics

A defective eye cannot see close objects clearly because their image is formed:

Optics

Identify the wrong description of the given figures.

Optics

For the myopic eye, the defect is cured by

Optics

To remove myopia ( short sightedness ) a lens of power $$0.66\ D$$ is required. The distant point of the eye is approximately

Optics

A person is suffering from 'presbyopia' ( myopia and hyper metropia both defects ) should use

Optics

A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.

Optics

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?

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