Eye

Q.

State the function of the suspensory ligament of the eye.

Q.

Boojho was having difficulty in seeing things in dim light. The doctor tested his eyesight and prescribed a particular vitamin supplement. He also advised him to include a few food items in his diet. (a) Which deficiency disease is he suffering from? (b) Which food component may be lacking in his diet? (c) Suggest some food items that he should include in his diet, (any four)

Q. ________ is a part of the eye that controls the size of the pupil.

1. Iris
2. Cornea
3. Sclera
4. Retina

Q. Which part of human eye transmits electric signals to the brain?

1. Retina
2. Auditory nerve
3. Optic nerve
4. Cornea

Q.

Account for the following

One feels blinded for a short time while coming out of a dark room.

Q.

The elongation of the eye-ball results in the defect of vision called ___.

Q.

What is the gel filling the vitreous chamber called?

Q. The condition of the eye where the distant objects appear blurry, while close objects appear normal is called:

1. Myopia
2. Hypermetropia
3. Night blindness
4. Xerophthalmia

Q.

In which condition will a female be color blind?

Q. Which among the following occurs while viewing distant objects?

1. Focal length decreases.
2. Ciliary muscles contract.
3. Ligaments relax.
4. Lens becomes thinner.

Q.

What is the main function of vitreous humour?

Q.

Hypermetropia is the defect of the eyeball being elongated.

1. True
2. False

Q. The lens divides the inner space of the eye ball into _________ and __________.

1. Pupil, Iris
2. Aqueous chamber, Vitreous chamber
3. Conjunctiva, Retina
4. Sclera, Cornea

Q.

Structure which maintain the shape of the eye lens in its position.

Q. Match the following.

$\begin{array}{cc}\text{Eye diseases}& \text{Defect}\\ \text{(1) Glaucoma}& \text{(A) an infection in the layer of the eye which causes inflammation}\\ \text{(2) Colour blindness}& \text{(B) increased pressure in the eye which causes damage to the optic nerve}\\ \text{(3) Conjunctivitis}& \text{(C) lens of the eye becomes opaque resulting in blindness}\\ \text{(4) Cataract}& \text{(D) inability to distinguish between colours due to defect in photoreceptors}\end{array}$

1. 1 - D, 2 - B, 3 - A, 4 - C
2. 1 - B, 2 - D, 3 - C, 4 - A
3. 1 - B, 2 - D, 3 - A, 4 - C
4. 1 - A, 2 - D, 3 - C, 4 - B

Q.

Name the bony socket that encloses and protects eyeballs.

Q.

Error due to incorrect positioning of the eyes is ________.

Q. Cataract is a disease which refers to

1. A defect in the optic nerve
2. Cloudiness in the eye-lens
3. A disease in the eye cornea
4. Inflammation in the eye

Q. Match the following.

$\begin{array}{cc}\text{Eye diseases}& \text{Defect}\\ \text{(1) Glaucoma}& \text{(A) an infection in the layer of the eye which causes inflammation}\\ \text{(2) Colour blindness}& \text{(B) increased pressure in the eye which causes damage to the optic nerve}\\ \text{(3) Conjunctivitis}& \text{(C) lens of the eye becomes opaque resulting in blindness}\\ \text{(4) Cataract}& \text{(D) inability to distinguish between colours due to defect in photoreceptors}\end{array}$

1. 1 - B, 2 - D, 3 - C, 4 - A
2. 1 - D, 2 - B, 3 - A, 4 - C
3. 1 - B, 2 - D, 3 - A, 4 - C
4. 1 - A, 2 - D, 3 - C, 4 - B

Q. Match the following:

$\begin{array}{cc}\text{Parts of the eye}& \text{Functions}\\ \text{(1) Cornea}& \text{(A) alters the curvature of the eye lens}\\ \text{(2) Ciliary muscles}& \text{(B) converts light to electrical impulses}\\ \text{(3) Retina}& \text{(C) transmits the generated impulses to the brain}\\ \text{(4) Optic nerve}& \text{(D) refracts the light rays and focuses onto the lens}\end{array}$

1. 1 - D, 2 - B, 3 - A, 4 - C
2. 1 - D, 2 - A, 3 - B, 4 - C
3. 1 - D, 2 - A, 3 - C, 4 - B
4. 1 - C, 2 - A, 3 - B, 4 - D

Q. A person is sitting in his room and reading a novel. He hears a bird chirping outside on a tree. He looks out of the window and sees the bird. Which ability of the eye enables him to clearly see the book which is close, and the bird which is far away?

1. binocular vision
2. dark adaptation
3. stereoscopic vision
4. accomodation

Q. Which among the following foods is NOT preferable for treating night blindness?

1. Carrot
2. Broccoli
3. Rice
4. Dates

Q.

Match the following.

Diseases / Defects	Causes
1) Glaucoma	A) Infection in one of the layers of the eye
2) Conjunctivitis	B) Defects of the cone cells
3) Colour Blindness	C) The lens of the eyes become opaque
4) Cataract	D) Accumulation of aqueous humour

1. 1 - D, 2 - A, 3 - B, 4 - C

2. 1 - D, 2 - C, 3 - B, 4 - A

3. 1 - D, 2 - C, 3 - A, 4 - B

4. 1 - A, 2 - B, 3 - C, 4 - D

Q.

Lens is held in the position by…………………..

Q. Which among the following eye defect is characterised by drying and wrinkling of conjuctiva?

1. Myopia
2. Hypermetropia
3. Colour blindness
4. Xerophthalmia

Q.

Differentiate between rods and cones of retina (Type of pigment).

Q. Iris regulates the amount of light entering the eye by controlling the size of the _______.

1. choroid
2. pupil
3. cornea
4. sclera

Q. Indications are given about an eye disorder:
(a) Aged people are affected.
(b) Gradual loss of power of vision.
i. Identify this disorder.
ii. What is the reason for this disorder?

Q. Match the following columns and choose the correct option.
$\begin{array}{cc}ColumnI& ColumnII\\ A.Fovea& 1.Providesopeningforentryoflight\\ B.Iris& 2.TransducesRGBlight\\ C.Pupil& 3.TransmitsinformationtoCNS\\ D.Lens& 4.Controlsamountoflightentering\\ E.Opticnerve& 5.Focuseslightontheretina\end{array}$

1. A - 5 B - 1 C - 4 D - 5 E - 2
2. A - 1 B - 2 C - 3 D - 4 E - 5
3. A - 4 B - 1 C - 5 D - 2 E - 3
4. A - 2 B - 4 C - 1 D - 5 E - 3
5. A - 5 B - 1 C - 4 D - 3 E - 2

Q.

When the ciliary muscles are relaxed, then the focal length of the eye lens ___.

1. remains constant

2. increases

3. decreases

4. first increases then decreases