Consider the following statements in the context of human eye:
(a) The diameter of the eye ball is about 2.3 cm.
(b) Iris is a dark muscular diaphragm that controls the size of the pupil.
(c) Most of the refraction for the light rays entering the eye occurs at the crystalline lens.
(d) While focusing on the objects at different distances the distance between the crystalline lens and the retina is adjusted by ciliary muscles.
The correct statements are –

Question

Tara's grandmother is 70 years old and has a passion for embroidery. She faces difficulty in threading the needle as the eye of the needle appears blurred. The ophthalmologist diagnosed it as an age-related disorder.

(a) Name the eye disorder she is suffering from.
(b) How can the above defect be corrected?
(c) Where is the image formed in the above disorder?

Answer 1

Analysis of statement (a):
The human eyeball's diameter is approximately 2.3 cm. This statement is correct, aligning with typical eye dimensions.

Analysis of statement (b):
The iris functions as a muscular diaphragm that adjusts the pupil's size. This statement is correct; the iris controls light entry by altering pupil diameter.

Analysis of statement (c):
Most light refraction entering the eye occurs at the crystalline lens. This statement is incorrect. The cornea is responsible for the majority of light refraction, not the crystalline lens.

Analysis of statement (d):
Ciliary muscles adjust the distance between the crystalline lens and the retina for focusing. This statement is incorrect. Ciliary muscles change the lens shape (accommodation) to focus light, not the lens-retina distance.

Conclusion:
Statements (a) and (b) are correct. Only these two statements accurately describe aspects of the human eye.

Correct Answer: (a) and (b)

The Correct Option is A

Solution and Explanation

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