Optical Instruments Quizz "Eye"
Questions and Answers
- 1.
The outer part of eye ball of thin layer which is clear and can be penetrated by the light is.....
- A.
Cornea
- B.
Aqueous humor
- C.
Pupil
- D.
Retina
Correct Answer
A. CorneaExplanation
The cornea is the clear, outer layer of the eye that allows light to enter the eye and helps focus it onto the retina. It acts as a protective covering for the iris, pupil, and anterior chamber. The cornea is responsible for about two-thirds of the eye's total focusing power and plays a crucial role in vision clarity.Rate this question:
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- 2.
What is the function of pupil?
- A.
Gives colour to the eye
- B.
Regulate the more or little light that enters into the eye
- C.
Making image of properties
- D.
Catcher screen of image
Correct Answer
B. Regulate the more or little light that enters into the eyeExplanation
The function of the pupil is to regulate the amount of light that enters the eye. It does this by adjusting its size in response to the brightness of the environment. In bright conditions, the pupil constricts or becomes smaller to limit the amount of light entering the eye. In dim conditions, the pupil dilates or becomes larger to allow more light to enter the eye. This regulation helps to protect the sensitive structures within the eye and ensures that the appropriate amount of light reaches the retina for clear vision.Rate this question:
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- 3.
To be able to see normal anymore, a myope can be helped by using glasses of.......
- A.
Positive lens
- B.
Convex lens
- C.
Concave or negative lens
- D.
Double lens
Correct Answer
C. Concave or negative lensExplanation
A myope, or a person with nearsightedness, has difficulty seeing objects clearly at a distance. To correct this, a concave or negative lens is used. This type of lens diverges the incoming light rays before they reach the eye, allowing the myope to focus the light properly on the retina. The concave lens helps to correct the refractive error and allows the myope to see objects clearly at a distance.Rate this question:
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- 4.
Why the people who suffer astigmatism cannot see clearly vertical and horizontal lines simultaneously?
- A.
Because the eye lens cannot made thin as it must so the image of object falls in front of the retina
- B.
Because the eye lens cannot be expanded as it must so the image of the object falls behind retina
- C.
Because the accommodation power of this eye is weaker as the effect of age increase
- D.
Because of curves of the eye cornea of astigmatism sufferer is not perfect anymore
Correct Answer
D. Because of curves of the eye cornea of astigmatism sufferer is not perfect anymoreExplanation
Astigmatism is a refractive error caused by an irregularly shaped cornea or lens in the eye. In a normal eye, the cornea is perfectly curved, allowing light to focus on a single point on the retina, resulting in clear vision. However, in astigmatism, the cornea is not perfectly curved, causing light to focus on multiple points on the retina. This leads to distorted or blurred vision, especially when looking at vertical and horizontal lines simultaneously, as the irregular shape of the cornea affects the way light is focused on the retina.Rate this question:
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- 5.
Which is not part of the eye is............
- A.
Iris
- B.
Pupil
- C.
Retina
- D.
Maleus
Correct Answer
D. MaleusExplanation
The correct answer is maleus. The maleus is actually a bone located in the middle ear, not a part of the eye. The iris, pupil, and retina are all structures found in the eye. The iris controls the size of the pupil, which regulates the amount of light entering the eye. The retina is the innermost layer of the eye that contains light-sensitive cells, allowing us to perceive images.Rate this question:
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