Physics, asked by 519357, 5 hours ago

write an article about the different defects are caused in vision. class 8 physics​

Answers

Answered by ishitadoutqueen
1

Explanation:

As we know, human eyes are slowly losing their accommodating power and person can not see clearly and comfortably in these situations. There are three main eye abnormalities, and they are

Myopia (near-sightedness

Far-sightedness or hypermetropia, and

Presbyopia.

By the use of appropriate spherical lenses, these defects are fixed.

Myopia

Myopia is also referred to as short-sightedness or near-sightedness.

What occurs is that light rays do not focus on the surface of the retina, but it focus just in front of it. When perceived, this results in images being blurry.

In such a scenario, distant objects appear out of sight, but close objects are visible. It is the reason why close or short-sightedness is often called myopia.

Answered by syedtahir20
0

  • As we know that the mismatch between corneal shape and eye length

        cause defects.

  • It is also called refractive errors.
  • which means problems in the refraction of the light by the cornea.
  • So due to this light is not focused on the retina.
  • There are the following defects of vision,

                               Presbyopia.

                               Farsightedness.

                               Near-sightedness.

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