Question

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Q) WHAT IS PRESBYPIA AND ASTIGMATISM .EXPLAIN BY SHOWING RAY DIAGRAM ?

NOTE :-

1) dOn'T taKe helP oF goOGLe bABa ❌❌

2)sPAmMers sTaY awAY ☺☺✋✋





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Answer 1

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Presbyopia is a defect of vision in which image formed on retina is flicks or sway out. This defects occurs with ageing. If a person with ageing, generally the ciliary muscle be weaker which is unable to set sharp image on the retina. Correction: - It is correctedby using bifocal lens.

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What exactly is astigmatism?

→★Well, in a perfectly-shaped eye, the cornea, or surface layer, is a sphere, like a baseball. It allows light to enter your eyes at the right angle and focus just so on the retina. That means your vision is sharp and crisp. But with astigmatism, the cornea’s shape is more like a football than a baseball. This irregularity makes the light rays focus on two points on the retina, not one. This causes blurry, distorted vision★

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Answer 2

Hello buddy..

Here's your answer

Answer :

● Presbyopia – The power of accommodation of eye usually decrease with ageing. For most of the people, the near point gradually recedes away. They find it difficult to see nearby objects comfortably and distant objects also.

● Astigmatism - It takes place due to irregular curvature or spherical shape of the cornea. In this defect, person is not able to differentiate between vertical and horizontal lines at a time. It can be corrected using the cylindrical lens.

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