Question

Q.6. a) Name any one common defect of the eye. How it can be corrected?
b) Which part of the eye regulates the amount of light entering the eye by
adjusting the size of the pupil.​

Answer 1

Answer:

Myopia: (nearsightedness) 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.

Explanation:

Myopia can be corrected by wearing glasses/contacts with concave lenses these help to focus the image on the retina.

Answer 2

1.Presbyopia is that defect of vision due to which an old person cannot see the nearby objects clearly due to loss of power of accommodation of the eye. ... It is possible to correct the refractive defects of the eye (such as myopia and hypermetropia) by using contact lenses or by undergoing surgical procedures.

2.iris

irisThe colored part of the eye which helps regulate the amount of light entering the eye. When there is bright light, the iris closes the pupil to let in less light. And when there is low light, the iris opens up the pupil to let in more light. Focuses light rays onto the retina.