The Eye

1.Each eyeball is controlled by ____ eye muscles. two two four four six six eight eight

2. What is the colour of the sclera? blue blue white white black black brown brown

3. The lens inside our eye is a piece of 3. The lens inside our eye is a piece of plane lens. plane lens. convex lens. convex lens. concave lens. concave lens.

4. The front part of the eye is covered by the 4. The front part of the eye is covered by the retina retina cornea cornea sclera sclera iris

5. Light ray passes through _______ and 5. Light ray passes through _______ and enters the eyes. enters the eyes. retina retina pupil pupil optic nerve optic nerve sclerotic coat sclerotic coat

6. Which of the following about the path of light entering the eyes is CORRECT? of light entering the eyes is CORRECT? lens -> pupil -> cornea -> jelly-like fluid lens -> pupil -> cornea -> jelly-like fluid -> sclerotic coat -> sclerotic coat pupil -> cornea -> lens -> jelly-like fluid pupil -> cornea -> lens -> jelly-like fluid -> retina -> retina cornea -> pupil -> lens -> jelly-like fluid cornea -> pupil -> lens -> jelly-like fluid -> retina -> retina iris -> lens -> jelly-like fluid -> retina

7. Which of the following correctly states the function of the lens? Refract light and allows light to focus on the retina. Refract light and allows light to focus on the retina. Maintain the shape of the eye ball. Maintain the shape of the eye ball. Control the amount of light entering the eye. Control the amount of light entering the eye. Absorb light and prevent reflection of light inside Absorb light and prevent reflection of light inside the eye ball. the eye ball.

8. The lens unit inside the camera is 8. The lens unit inside the camera is similar to the _______ inside human eye. similar to the _______ inside human eye. Cornea Cornea Iris Iris Lens Lens Circular muscle Circular muscle

9. The ______ inside the camera is 9. The ______ inside the camera is similar to the cornea inside human eye. similar to the cornea inside human eye. lens unit lens unit diaphragm diaphragm filter filter film film

10. Which of the following description 10. Which of the following description about watching distant object is CORRECT? about watching distant object is CORRECT? Ciliary muscle contracts, lens no longer forced outward, lens become thicker and more curved. Ciliary muscle contracts, lens is forced outward, lens become thinner and flatter. Ciliary muscle relaxes, lens is forced outward, lens become thinner and flatter. Ciliary muscle relaxes, lens no longer forced outward, lens become thicker and more curved.

11. Retina contains millions of light-sensitive cells. light-sensitive cells. optic nerve. lens. iris.

12. Which of the following is NOT a common eye defect mentioned in the programme ? eye defect mentioned in the programme ? Short sight Short sight Long sight Long sight Presbyopia Presbyopia Colour blindness Colour blindness

13. What is the casue of astigmatism? The lens becomes cloudy. The lens becomes cloudy. The curature of the cornea surface or lens is The curature of the cornea surface or lens is uneven. uneven. The eyeball is too long. The eyeball is too long. The eyeball is too short. The eyeball is too short.

People with astigmatism can wear 14. People with astigmatism can wear ________ to correct it. ________ to correct it. Concave lens Concave lens Convex lens Convex lens Column shaped glasses Column shaped glasses

15. Which of the following is NOT an acquired cause of short-sighted? People often look at near objects. The eye ball is too long. The posture while reading is incorrect. People spend a long time looking at near objects.

16. Short-sighted people can wear spectacles of _______ to correct short sight. of _______ to correct short sight. concave lens concave lens convex lens convex lens

17. Which of the following is NOT a cause of long-sighted? The eye ball is too long. The ciliary muscle is too weak. The lens is too thin and flat. The eye ball is too short.

18. Which of the following is NOT a cause of presbyopia? 18. Which of the following is NOT a cause of presbyopia? The lens cannot become thinner and flatter. The ciliary muscle gets weaker. The lens loses elasticity. The lens cannot become thicker and more curved.

19. Which of the following is the ideal reading distance? 10 inches 12 inches 14 inches 20 inches