Question

A person of near-sightedness for a distant vision - 1. 0 D is using glasses of power. When he is older, he need to read the book separately + 2.0 D capacity glasses are required. Explain why this happened?

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Answer 1

Because at the older age our ciliary musceles got weak which results in myopia and hypermytropia both occurs in our eyes at the same time.

Answer 2

Solution:-

°•° P = - 1.0 D

•°• f = 100 / p cm

= - 100/1.0 = - 100 cm

It is clear that the distant point of the person has come to a distance of 100 cm.

To look at the objects located on the eternal in this state, he uses such glasses (-1.0 D), which makes an image of the object located on the eternal distance of 100 cm.

From this, humans (25 cm and 100 cm in the middle) see humans using the eye's compositing capability.

As the age progresses, its eye absorption capacity also decreases.

Due to this, he also needs glasses to see things nearby